Insights into complications after unicompartmental knee arthroplasty.

Zhao's study, offers a comprehensive analysis of unicompartmental knee arthroplasty (UKA) revision indications. The study provides a detailed, case-by-case analysis of the factors leading to knee revision surgery in 13 patients. Not only elucidates the complexities of UKA revisions but also underscores the importance of continuous improvement in surgical techniques and the adoption of innovative technologies.

Clinical, imaging, arthroscopic, and histologic features of bilateral anteromedial meniscofemoral ligament: A case report.

BACKGROUND: The anteromedial meniscofemoral ligament (AMMFL) is a very rare entity, commonly unrecognized and underreported. Although it was not proved to be a cause of anterior knee pain, concerns have been raised on the relationship between the presence of this structure and medial meniscus injury secondary to its abnormal motion. Regarding histologic examination, some studies have shown meniscus-like fibrocartilage, while others have identified it as ligament-like collagenous fibrous connective tissue. CASE SUMMARY: We report the case of a 34-year-old ballerina with an AMMFL associated with a torn medial meniscus of both knees. Surgery was performed to treat the meniscal injury and two biopsies of each AMMFL were taken in different locations to define the histopathological composition. Histologic examination revealed fibrocartilaginous tissue compatible with meniscus. Follow-up evaluation one year after surgery evidenced full remission of symptoms and the patient had resumed her athletic activities. CONCLUSION: Clinical, magnetic resonance imaging, arthroscopic, and histological features have been carefully described to better characterize the AMMFL.

Failure rate, return-to-sports and magnetic resonance imaging after meniscal repair: 119 patients with 7 years mean follow up.

BACKGROUND: One of the most important factors to consider in relation to meniscal repair is the high failure rate reported in the existing literature. AIM: To evaluate failure rates, return to sports (RTS) rate, clinical outcomes and magnetic resonance image (MRI) evaluation after meniscus suture repair for longitudinal tears at a minimum 2-year-follow-up. METHODS: We conducted a retrospective review of meniscal repairs between January 2004 and December 2018. All patients treated for longitudinal tears associated or not with an anterior cruciate ligament reconstruction (ACL-R) were included. Meniscal ramp lesions, radial and root tears, associated with multiligament injuries, tibial fracture and meniscal allograft transplants were excluded. Surgical details and failure rate, defined as symptomatic patients who underwent a revision surgery, were analyzed. As isolated bucket handle tears (BHTs) were usually associated with higher failure rates, we compared BHTs and not BHTs associated or not with an ACL-R. Since 2014, the inside-out technique using cannulas and suture needles with 2-0 Tycron began to predominate. In addition, the number of stitches per repair was increased. In view of differences in surgical technique, we compared two different cohorts: before and after 2014. We recorded the RTS according to the level achieved and the time to RTS. Lysholm and IKDC scores were recorded. Patients were studied with x-rays and MRI as standard postoperative control. RESULTS: One hundred and nineteen patients were included with a mean follow up of 7 years (SD: 4.08). Overall failure rate was 20.3% at a mean 20.1 mo. No statistically significant differences were found when comparing failure for medial and lateral meniscal repair (22.7% and 15.3%, P = 0.36), BHTs and not BHTs (26% and 17.6%, P = 0.27), isolated or associated with an ACL-R (22.9% and 18%, P = 0.47), or when comparing only BHTs associated with an ACL-R (23% and 27.7%, P = 0.9) or not. When comparing cohorts before and after 2014, we found a significant decrease in the overall failure rate from 26% to 11% (P < 0.03). Isolated lesions presented a decrease from 28% to 6.6% (P = 0.02), BHTs from 34% to 8% (P = 0.09) and those associated with an ACL-R from 25% to 10% (P = 0.09). Mean RTS time was 6.5 mo in isolated lesions and 8.64 mo when associated with an ACL-R. Overall, 56% of patients returned to the same sport activity level. Mean pre and postoperative Lysholm scores were 64 and 85 (P = 0.02), and IKDC 58 and 70 (P = 0.03). Out of 84 asymptomatic patients evaluated with MRI, 39% were classified as "not healed" and 61% as "healed". CONCLUSION: Even though the overall failure rate of our series was 20.3%, we found a statistically significant decrease from 26% to 11%, not only for isolated lesions, but also for BHT's and those associated with an ACL-R when comparing our series in two different cohorts, most probably due to improvements in surgical technique.

Combined Assessments of Patellar Tendon and Hamstring Tendon Parameters on Preoperative Magnetic Resonance Imaging Can Improve Predictability of Hamstring Tendon Autograft Diameter in the Setting of Anterior Cruciate Ligament Reconstruction.

Purpose: To evaluate whether preoperative magnetic resonance imaging (MRI) measurements of multiple tendon autograft sources could be used to improve estimates of intraoperative hamstring tendon autograft (HTA) diameter. Methods: Patients who underwent anterior cruciate ligament reconstruction with HTA at our institution were identified through electronic health records. Preoperative MRI tendon measurements of the patellar tendon (PT) length, PT width, PT thickness, quadriceps tendon thickness, semitendinosus tendon (ST) cross-sectional area (CSA), and gracilis tendon (GT) CSA were conducted by 2 independent evaluators using digital imaging measurement tools. Results: A total of 53 patients met the inclusion criteria, with a mean HTA diameter of 7.98 ± 0.7 mm. Height greater than 1.63 m, weight greater than 63.4 kg, PT length greater than 4.2 cm, PT thickness greater than 0.33 cm, ST CSA greater than 10.8 mm2, and GT CSA greater than 6.3 mm2 were associated with an HTA of 8 mm or greater (P < .005). Female sex was associated with an HTA of less than 8 mm (P < .05). PT length, PT thickness, and GT CSA were the strongest predictors of an HTA of 8 mm or greater and were combined into an additive logistic regression model: Score = -23.24 + (1.68 × PT length) + (20.104 × PT thickness) + (1.48 × GT CSA). If the score was greater than 0.237, the HTA graft diameter was predicted to be 8 mm or greater with 83% specificity, 91% sensitivity, and 87% accuracy. Conclusions: By combining PT length and PT thickness measurements with GT CSA measurements in a logit function model, we were able to show improved overall specificity, sensitivity, and accuracy of estimated HTA diameters in our data set when compared with assessments of anthropometric, ST CSA, GT CSA, or combined ST-GT CSA measurements in isolation. Clinical Relevance: Preoperative MRI measurements may be used to screen whether a patient is likely to have an 8-mm graft in the setting of anterior cruciate ligament reconstruction with HTA and thus may help guide graft choice.

Revision anterior cruciate ligament reconstruction: Return to sports at a minimum 5-year follow-up.

BACKGROUND: Between 43% and 75% of patients who undergo primary anterior cruciate ligament (ACL) surgery return to sport activity. However, after a revision ACL reconstruction (ACLR) the rate of return to sports is variable. A few publications have reported returns to sports incidence between 56% to 100% after revision ACLR. AIM: To determine return to sports and functional outcomes after a single-stage revision ACLR with a 5-year minimum follow-up at a single institution. METHODS: All patients operated between 2010 and 2016 with a minimum 5 years of follow-up were included. Type of sport, intensity, frequency, expectation, time to return to sport and failure rate were recorded. Lysholm, Tegner and International Knee Documentation Committee forms were evaluated prior to the first ACLR surgery, at 6 mo after primary surgery and after revision ACLR at 5 years minimum of follow-up. Objective stability was tested with the knee arthrometer test (KT-1000 knee arthrometer, Medmetric Corp). RESULTS: A total of 41 patients who underwent revision ACLR during that period of time were contacted and available for follow-up. Median patient age at time of revision was 29 years old [interquartile range (IQR): 24.0-36.0], and 39 (95.0%) were male. The median time from revision procedure to follow-up was 70 mo (IQR: 58.0-81.0). Regarding return to sports, 16 (39.0%) were at the same level compared to preinjury period, and 25 patients (61.0%) returned at a lower level. Sixty-three percent categorized the sport as very important and 37.0% as important. One patient (2.4%) failed with a recurrent ACL torn. Mean preoperative Lysholm and subjective International Knee Documentation Committee scores were 58.8 [standard deviation (SD) 16] and 50 (SD 11), respectively. At follow-up, mean Lysholm and subjective International Knee Documentation Committee scores were 89 (SD 8) and 82 (SD 9) (P = 0.0001). Mean Tegner score prior to primary ACLR was 6.7 (SD 1.3), 5.1 (1.5 SD) prior to revision ACLR and 5.6 (1.6 SD) at follow-up (P = 0.0002). Overall, knee arthrometer test measurement showed an average of 6 mm (IQR: 4.0-6.0) side-to-side difference of displacement prior to revision ACLR and 3mm (IQR: 1.5-4.0) after revision. CONCLUSION: Almost 40.0% of patients returned to preinjury sports level and 60.0% to a lower level. These may be useful when counseling a patient regarding sports expectations after a revision ACLR.

Overview of the anterolateral complex of the knee.

In the last few years, much more information on the anterolateral complex of the knee has become available. It has now been demonstrated how it works in conjunction with the anterior cruciate ligament (ACL) controlling anterolateral rotatory laxity. Biomechanical studies have shown that the anterolateral complex (ALC) has a role as a secondary stabilizer to the ACL in opposing anterior tibial translation and internal tibial rotation. It is of utmost importance that surgeons comprehend the intricate anatomy of the entire anterolateral aspect of the knee. Although most studies have only focused on the anterolateral ligament (ALL), the ALC of the knee consists of a functional unit formed by the layers of the iliotibial band combined with the anterolateral joint capsule. Considerable interest has also been given to imaging evaluation using magnetic resonance and several studies have targeted the evaluation of the ALC in the setting of ACL injury. Results are inconsistent with a lack of association between magnetic resonance imaging evidence of injury and clinical findings. Isolated ACL reconstruction may not always reestablish knee rotatory stability in patients with associated ALC injury. In such cases, additional procedures, such as anterolateral reconstruction or lateral tenodesis, may be indicated. There are several techniques available for ALL reconstruction. Graft options include the iliotibial band, gracilis or semitendinosus tendon autograft, or allograft.

Quality and Variability of Physical Therapy Protocols Varies Widely for Osteochondral Allograft Transplantation of the Femoral Condyles.

OBJECTIVE: To assess the quality and variability of osteochondral allograft (OCA) transplantation rehabilitation protocols associated with academic orthopedic programs in the United States. DESIGN: A systematic review was performed to collect all publicly available online rehabilitation protocols for femoral condyle OCA transplant from US academic orthopedic programs participating in the Electronic Residency Application Service. These protocols were evaluated for inclusion of different rehabilitation components as well as timing of suggested initiation of these activities. RESULTS: A total of 22 protocols were included. Although 91% of protocols recommended bracing, wide variation exists in total time of utilization. Median time for full weight bearing (FWB) was 7 weeks (range 4-8). On average, each protocol mentioned 9 (range 2-18) different strengthening exercises. The median time suggested to return to high-impact activities was 9 months (range 8-12). Only 3 protocols (14%) offered criteria of advancement for each phase as well as criteria for discharge. CONCLUSION: Very few of the academic orthopedic programs have published online rehabilitation protocols following OCA transplantation. Although there is wide variation between the protocols, it allowed the identification of trends or patterns that are more common. However, there is need for more standardized evidence-based rehabilitation protocols which are easy to understand and follow by patients.

Clinical Outcomes of Meniscal Allograft Transplantation With Respect to the Minimal Clinically Important Difference.

BACKGROUND: Arthroscopic-assisted meniscal allograft transplantation (MAT) has become a viable and effective treatment option for young active patients with postmeniscectomy pain. The minimal clinically important difference (MCID) of patient-reported outcome measures (PROMs) is imperative to evaluate the clinical significance of surgical interventions and inform clinical practice guidelines in orthopaedic surgery. PURPOSE: To perform a systematic review of clinical outcome studies of patients undergoing MAT and compare postoperative improvement with established MCID thresholds. STUDY DESIGN: Systematic review and meta-analysis; Level of evidence, 4. METHODS: A systematic review was performed using the PubMed, Web of Science, and Cochrane Library databases. A meta-analysis was performed using data obtained from studies reporting patient-reported outcomes. Subgroup analysis was performed on patients undergoing isolated lateral MAT using fresh-frozen grafts. Weighted mean postoperative improvements in the International Knee Documentation Committee (IKDC), Lysholm, and visual analog scale for pain (VAS pain) were calculated and compared with MCID values to determine if they met the MCID threshold. RESULTS: A total of 35 studies were identified, including 1658 unique patients. Weighted mean postoperative score improvements exceeded MCID thresholds for the VAS pain, IKDC, and Lysholm. Subgroup analysis of patients undergoing isolated lateral fresh-frozen MAT demonstrated postoperative improvements exceeding the MCID for the Lysholm and VAS pain. CONCLUSION: Evaluating postoperative PROMs with respect to the MCID is crucial to evaluate the effect of MAT on functional improvement. The results of the present meta-analysis suggest that postoperative improvements after MAT are clinically meaningful as reflected by PROMs exceeding the MCID threshold for the IKDC, Lysholm, and VAS pain.

Preparación del injerto con vancomicina y su incidencia en la disminución de infección luego de la reconstrucción del LCA / Presoaking of autograft in vancomycin for primary ACL reconstruction. Incidence of infection decreased

Introducción: La artritis séptica (AS) posterior a la cirugía de reconstrucción del LCA (RLCA) es una complicación infrecuente pero potencialmente devastadora. Para disminuir el riesgo de esta complicación, en el 2019 comenzamos a utilizar el tratamiento local del injerto de LCA con vancomicina previo a su colocación. El objetivo de este estudio fue comparar la incidencia de AS postoperatoria en pacientes en los que se utilizó este protocolo con el período inmediatamente anterior, en el que no se usó. Materiales y métodos: Se efectuó un estudio de cohorte retrospectiva con inclusión de todos los pacientes a los que se les realizó una RLCA primaria. Se analizaron dos períodos consecutivos: enero de 2016 a febrero de 2019 (grupo sin tratamiento local con vancomicina) y marzo de 2019 a marzo de 2021 (grupo con protocolo con vancomicina). Se estimó la incidencia de AS postoperatoria en ambos grupos. Se registraron también los casos de infección superficial del sitio quirúrgico y los casos de rigidez postoperatoria. Resultados: se incluyeron un total de ochocientos ocho pacientes. El grupo sin vancomicina quedó conformado por quinientos cincuenta y un (68%) pacientes y el grupo con vancomicina por doscientos cincuenta y siete (32%). En total, siete de los quinientos cincuenta y un pacientes en los cuales no se utilizó vancomicina desarrollaron AS, lo que arrojó una incidencia del 1.27% (IC 95%: 0.5% - 2.5%), mientras que no se registraron casos de AS en el grupo de pacientes en los cuales se utilizó el protocolo con vancomicina (p = 0.07). Con respecto a las infecciones superficiales, se registraron cuatro casos, todas también en el grupo sin vancomicina (p = 0.17). En cuanto a los casos de rigidez postoperatoria se registraron en total catorce, doce del primer grupo (2.1%) y dos del segundo grupo (0.78%) (p = 0.156). Conclusión: El tratamiento local de los injertos con vancomicina previo a la RLCA evitó la AS postoperatoria durante el período de estudio, en comparación con el período inmediatamente anterior, en el que no se utilizó vancomicina. Nivel de Evidencia: III

Introduction: Postoperative septic arthritis (SA) after anterior cruciate ligament reconstruction (ACLR) is a rare but potentially devastating complication. To decrease this risk in 2019 we started presoaking ACL grafts with vancomycin prior to implantation. The purpose of this study was to compare the rate of postoperative SA with and without vancomycin presoaked grafts. Materials and methods: A retrospective cohort study was conducted including all patients who underwent primary ACLR. Consecutive periods were studied, inclusive of January 2016 through February 2019 (group without vancomycin) and March 2019 through March 2021 (group with vancomycin protocol). The final outcome studied was occurrence of postoperative SA in both groups. Cases of superficial wound infection and cases of postoperative arthrofibrosis were also recorded. Results: a total of 808 patients were included in the study: 551 (68%) in the group without vancomycin and 257 (32%) in the vancomycin protocol group. Seven cases of postoperative SA were noted in the first group (rate 1.27%, IC95%: 0,5% - 2,5%), while no cases of SA were noted in the vancomycin group during the study period (p = 0.07). Regarding superficial wound infection, four cases were noted, all of them in the first group (p = 0.17). A total of fourteen cases of arthrofibrosis were treated with a mobilization under anesthesia, twelve from the first group (2.1%) and two from the vancomycin group (0.78%) (p = 0.156). Conclusion: Presoaking of autografts in vancomycin for primary ACLR prevented the occurrence of postoperative SA during the study period as compared with no soaking of the grafts. Level of Evidence: III

Osteonecrosis bilateral de rodilla tratada con descompresión y concentrado de aspirado de médula ósea / Bilateral knee osteonecrosis with decompression and bone marrow concentrate

Descripta por Ahlbäck en 1968, la osteonecrosis de rodilla es una patología con un gran potencial de morbilidad. Está dividida en tres grandes grupos: primaria/espontánea, postoperatoria y secundaria/atraumática. Esta última podría estar directamente relacionada con el consumo prolongado de corticoides. Su tratamiento constituye un desafío para el cirujano ortopedista. Va a depender del estadio de la enfermedad y del colapso articular, y se intentará siempre preservar la superficie articular nativa. Dentro de las distintas opciones terapéuticas, las terapias biológicas constituyen una herramienta potencialmente valiosa como complemento al tratamiento quirúrgico, y muestran resultados clínicos esperanzadores. Presentamos el caso de una paciente con una osteonecrosis de rodilla bilateral, secundaria al consumo crónico de corticoides, tratada con una artroscopía bilateral asociada a perforaciones subcondrales descompresivas y aplicación subcondral de concentrado de médula ósea (CMO), con evolución satisfactoria de los síntomas a los treinta meses de seguimiento en la rodilla derecha, mientras que en la rodilla izquierda presentó una evolución tórpida de los síntomas a partir de los veinticuatro meses, por lo que está en plan de reemplazo articular.

Described by Ahlbäck in 1968, osteonecrosis of the knee is a pathology with great potential for morbidity. It is divided into three large groups: primary/spontaneous, postoperative, and secondary/atraumatic. The latter might be directly related to prolonged consumption of steroids. Its treatment is a challenge for the orthopedist. It will depend on the disease stage and articular collapse, always trying to preserve the native articular surface. Within the different therapeutic options, biological therapies are a potentially valuable tool as a complement to surgical treatment, showing encouraging clinical results. We present the case of a female patient with bilateral osteonecrosis of the knee, secondary to chronic consumption of steroids, treated with bilateral arthroscopy associated with decompressive subchondral perforations and subchondral application of bone marrow concentrate (BMC), with a satisfactory evolution of symptoms after thirty months of follow-up in the right knee. However, the left knee showed a torpid evolution of symptoms after twenty-four months of follow-up, so she is on a joint replacement plan

The Reliability of 3-T Magnetic Resonance Imaging to Identify Arthroscopic Features of Meniscal Tears and Its Utility to Predict Meniscal Tear Reparability.

BACKGROUND: The ability to predict meniscus tear reparability based on preoperative magnetic resonance imaging (MRI) is desirable for postoperative planning; however, the accuracy of predictive methods varies widely within the orthopaedic and radiology literature. PURPOSE/HYPOTHESIS: The purpose was to determine if the higher resolution offered by 3-T MRI improves the accuracy of predicting reparability compared with previous investigations using 1.5-T MRI. Our hypothesis was that a higher field strength of 3-T MRI would result in improved reliability assessments and predictions of meniscus tear reparability compared with previous studies utilizing a 1.5-T MRI platform. STUDY DESIGN: Cohort study (diagnosis); Level of evidence, 2. METHODS: A total of 44 patients who underwent meniscus repair were matched by age, sex, and body mass index to 43 patients who underwent partial meniscectomy. Overall, 2 orthopaedic surgeons and 2 musculoskeletal radiologists independently and blindly reviewed the preoperative MRI scans for all 87 patients. For each meniscus tear, reviewers evaluated the following criteria: tear pattern, tear length, tear distance from the meniscocapsular junction, tear thickness, and integrity of any inner meniscal fragment. The resultant data were then applied to 5 different approaches for predicting meniscal reparability. RESULTS: The accuracy for all examined prediction methods was poor, ranging from 55% (3-point method) to 72% (classification tree method) among all reviewers. Interobserver reliability for examined criteria was also poor, with kappa values ranging from 0.07 (inner meniscal fragment status) to 0.40 (tear pattern). CONCLUSION: MRI continues to be a poor predictor of meniscus tear reparability as assessed by arthroscopic criteria, even when using higher resolution 3-T scanners. Interobserver reliability in this setting can be poor, even among experienced clinicians.

Has platelet-rich plasma any role in partial tears of the anterior cruciate ligament? Prospective comparative study.

BACKGROUND: Partial tears of the anterior cruciate ligament (ACL) are frequent, and there is still considerable controversy surrounding their diagnosis, natural history and treatment. AIM: To examine patient-reported outcomes, physical examination and magnetic resonance imaging (MRI) findings of partial ACL tears treated with an intraarticular injection of platelet-rich plasma (PRP) compared to a control group. METHODS: From January 2015 to November 2017, consecutive patients from a single institution with partial ACL tears treated nonoperatively were prospectively evaluated. Partial tears were defined as a positive Lachman test with a clear end-point, a negative pivot-shift and less than 3 mm of side-to-side difference using the KT1000 arthrometer. Patients in group 1 were treated with one intraarticular injection of PRP and specific physical therapy protocol. Control group consisted of patients treated only with physical therapy. Prospective analyzed data included physical examination, Tegner activity level and Lysholm and International Knee Documentation Committee scores. Baseline MRI findings and at 6 mo follow-up were reviewed. Failure was defined as those patients with clinical instability at follow-up that required a subsequent ACL reconstruction. RESULTS: A total of 40 patients where included, 21 treated with PRP injection with a mean follow-up of 25 mo [standard deviation (SD): 3.6] and 19 in the control group with a mean follow-up of 25 mo (SD: 5.68). Overall failure rate was 32.0% (n = 13). No significant differences were observed between groups regarding subjective outcomes, return to sport and failure rate. MRI findings revealed an improvement in the ACL signal in half of the patients of both groups. However, we did not find a significant relationship between MRI findings and clinical outcomes. CONCLUSION: Overall, 95.0% of patients returned to sports at a mean follow-up of 25 mo. Mean time to return to sports was 4 mo. Out of these patients, almost 30.0% in each group had a new episode of instability and required surgery at a median time of 5 mo in group 1 and 8 mo in group 2. The addition of PRP alone was not sufficient to enhance any of the outcome measures evaluated, including MRI images, clinical evaluation and failure rate.

Combined Total Knee Arthroplasty and Medial Patellofemoral Ligament Reconstruction for Chronic Patellar Dislocation and Severe Osteoarthritis.

Chronic patellar dislocation in the setting of severe knee osteoarthritis is a rare clinical problem. Surgical management often consists of total knee arthroplasty combined with realignment of the extensor mechanism. Several techniques have been described to anatomically restore the extensor apparatus, and literature regarding this topic consists mainly of case reports. We describe a technique using combined medial patellofemoral ligament reconstruction using allograft tissue and total knee arthroplasty with patellar resurfacing for the treatment of chronic patellar dislocation and severe osteoarthritis.

Hybrid Bone-Grafting Technique for Staged Revision Anterior Cruciate Ligament Reconstruction.

Although most patients who undergo anterior cruciate ligament (ACL) reconstruction achieve long-term functional stability and symptom relief, graft rupture rates range from 2% to 10%1,2. A small subset of these patients require a 2-stage revision ACL reconstruction because of tunnel osteolysis or tunnel malposition that will interfere with the planned revision tunnel placement3. In the present article, we describe the hybrid use of arthroscopically delivered injectable allograft matrix in the femur and pre-shaped bone dowels in the tibia for the treatment of lower-extremity bone deficiencies. Description: After induction of anesthesia, approximately 60 cc of bone marrow aspirate is harvested from the anterior iliac crest with use of sterile techniques and is processed to obtain bone marrow aspirate concentrate. Routine diagnostic knee arthroscopy is performed via the standard anterolateral and anteromedial portals. Any additional intra-articular pathology is addressed, followed by excision of the remnant graft material, removal of existing femoral hardware as needed, and exposure of the existing bone tunnels. The femoral tunnel is debrided arthroscopically, removing all soft-tissue remnants. The existing tibial tunnel is exposed via the previous anteromedial tibial incision when possible. Again, any existing tibial hardware is removed. The tibial tunnel is then prepared with use of a combination of sequential reaming and dilation. A shaver and curets are utilized to debride the sclerotic walls of the tunnel and remove the remnant graft material. A cannulated allograft bone dowel is then impacted into place over a guidewire, ensuring that the graft is not proud within the joint space. An injectable bone allograft matrix composite is prepared by manually mixing 5 mL of StimuBlast demineralized bone matrix (Arthrex) and 5 mL of FlexiGraft cortical fibers (Arthrex), along with the previously obtained bone marrow aspirate concentrate. Under dry arthroscopy, this bone graft is delivered into the femoral tunnel via a cannula with use of the anteromedial portal. Finally, a Freer elevator is used to contour the graft at the aperture of the tunnel. Graft osteointegration is mandatory prior to proceeding with the second stage of the procedure. Typically, a minimum 3-month follow-up is necessary to confirm adequate graft incorporation on computed tomography. Alternatives: As an alternative to the 2-stage procedure, previous studies have suggested the use of a single-stage revision utilizing cylindrical allografts or multiple "stacked screws."4-6 In addition, a number of bone allograft and autograft options have been described. Autologous bone graft can be harvested from the ipsilateral iliac crest or proximal aspect of the tibia with use of a variety of techniques7-10. Allograft bone options include cancellous bone chips and commercially available bone matrices or dowels11-14. Finally, another viable option is calcium phosphate bone graft substitutes15. There is a paucity of high-quality studies comparing available bone graft materials for revision ACL reconstruction; thus, no consensus exists regarding the optimal choice16. Rationale: A 2-stage approach is typically indicated for cases that demonstrate tunnel enlargement (>12 mm) that would compromise graft fixation or non-anatomic tunnel placement that will interfere with placement of the revision tibial tunnel3. The aim of the first stage is to re-establish adequate bone stock to optimize future tunnel placement and healing of the ACL graft during the second stage. We believe that this 2-stage approach is a reliable and safe method of treating enlarged, irregularly shaped bone tunnel defects while minimizing the risk of complications. Furthermore, the use of allograft material avoids the donor-site morbidity and volume limitations associated with the use of autograft bone. In the case of the femoral tunnel, the injectable bone graft composite has the advantage of being easily delivered arthroscopically while completely filling irregularly shaped tunnels. The use of bone marrow aspirate concentrate may improve the rate of graft healing as well as a hydrating substance to reduce viscosity and facilitate the flow of the bone graft material through the cannula16,17. For the tibia, especially in cases of lengthy tibial bone deficiencies, allograft bone dowels are commercially available off-the-shelf in a variety of different lengths and diameters to allow for adequate fill of bone defects. Expected Outcomes: It is well known that outcomes following revision ACL reconstruction are inferior to those following primary ACL reconstruction, with a number of variables, beyond those associated with the surgical technique, influencing clinical outcomes18. Few studies have reported on the results of 2-stage revision ACL reconstruction with use of allograft bone; however, a high rate of allograft bone integration and improved bone quality at the time of revision ACL reconstruction have been reported13. Moreover, Mitchell et al. reported no differences in either subjective outcomes or failure rates between the 1-stage and 2-stage revision ACL reconstruction groups11. Important Tips: Utilize computed tomography for preoperative assessment and measurement of the extent of osteolysis.If possible, obtain the operative report for the index ACL procedure in order to identify any preexisting hardware and to obtain any instrumentation that may be needed to facilitate hardware removal.Multiple bone dowel sizes are available off the shelf.A 70° arthroscope can aid in visualization of the entire tibial and femoral tunnel.Although the bone graft matrix can be injected while the joint is filled with irrigation fluid, we find it easier to administer the graft under dry arthroscopic conditions.Place the scope inside the tibial tunnel to confirm appropriate removal of soft tissue and hardware. Circumferential native cancellous bone should be visualized.It is acceptable to retain previous hardware if it does not interfere with the new tunnel placement.Utilize prior incisions to access the tibial tunnel.Do not underestimate the amount of bone graft needed for each tunnel.Avoid excessive force during impaction of the dowels. Acronyms and Abbreviations: ACLR = Anterior cruciate ligament reconstructionBMAC = Bone marrow aspirate concentrateMRI = Magnetic resonance imagingCT = Computed tomographyBTB = Bone-patellar tendon-boneDVT = Deep vein thrombosisROM = Range of motion.

Microfracture for the Treatment of Symptomatic Cartilage Lesions of the Knee: A Survey of International Cartilage Regeneration & Joint Preservation Society.

OBJECTIVE: The purpose of this study was to describe the current practice trends for managing symptomatic cartilage lesions of the knee with microfracture among ICRS (International Cartilage Regeneration & Joint Repair Society) members. DESIGN: A 42-item electronic questionnaire was sent to all ICRS members, which explored indications, surgical technique, postoperative management, and outcomes of the microfracture procedure for the treatment of symptomatic, full thickness chondral and osteochondral defects of the knee. Responses were compared between surgeons from different regions and years of practice. RESULTS: A total of 385 surgeons answered the questionnaire. There was a significant difference noted in the use of microfracture among surgeons by region (P < 0.001). There was no association between the number of years in practice and the self-reported proportion of microfracture cases performed (P = 0.37). Fifty-eight subjects (15%) indicated that they do not perform microfracture at all. Regarding indication for surgery, 56% of surgeons would limit their indication of microfracture to lesions measuring 2 cm2 or less. Half of the surgeons reported no upper age or body mass index limit. Regarding surgical technique, 90% of surgeons would recommend a formal debridement of the calcified layer and 91% believe it is important to create stable vertical walls. Overall, 47% of surgeons use biologic augmentation, with no significant difference between regions (P = 0.35) or years of practice (P = 0.67). Rehabilitation protocols varied widely among surgeons. CONCLUSIONS: Indications, operative technique, and rehabilitation protocols utilized for patients undergoing microfracture procedures vary widely among ICRS members. Regional differences and resources likely contribute to these practice pattern variations.

Uso de conos de metal trabecular para defectos óseos severos en cirugía de revisión de reemplazo total de rodilla / The use of trabecular metal cones for the management of severe bone defects in revision total knee replacement

Introducción: Las alternativas reconstructivas para defectos óseos severos en la cirugía de revisión de prótesis son las camisas metafisarias, los conos de metal trabecular y el injerto óseo impactado o estructural. El objetivo del estudio fue analizar la tasa de osteointegración de los conos de metal trabecular en pacientes con cirugía de revisión de prótesis total de rodilla. El objetivo secundario fue analizar los resultados funcionales, las tasas de complicaciones y reoperaciones. Materiales y Métodos: Cohorte retrospectiva de pacientes con conos de metal trabecular colocados en la cirugía de revisión de prótesis y un seguimiento mínimo de 2 años. Se evaluaron las causas de la revisión, cirugías previas, tipo de defecto óseo, cantidad y tipo de conos utilizados, y los diseños de las prótesis. Se realizó una evaluación clínico-radiográfica, se registraron las complicaciones y las revisiones ulteriores. Resultados: Se evaluó a 35 pacientes (49 conos de metal trabecular) en forma retrospectiva, con un seguimiento promedio de 32.1 meses. La mayoría de los defectos eran tibiales AORI 3, seguidos de los femorales tipo 3. La tasa de osteointegración de los conos fue del 94%; la de complicaciones, del 20% y la de reoperaciones, del 8,5%. El KSS objetivo promedio aumentó de 39 en el preoperatorio a 71 en el último control y el puntaje de la EAV promedio fue 8 y 2,5, respectivamente. Conclusión: La excelente tasa de osteointegración (94%) y los buenos resultados clínicos posicionan a los conos de metal trabecular como una alternativa para los defectos óseos severos. Nivel de Evidencia: IV

Introduction: Major bone defects represent a challenge during revision total knee arthroplasty (TKA) and there is still considerable debate about the best therapeutic option. The purpose of this study was to retrospectively assess the osseointegration rate of trabecular metal cones in revision TKA with severe bone defects. The secondary purpose was to evaluate the functional outcomes and complication and reoperation rates. Materials and Methods: A single-center, retrospective cohort including all consecutive cases of revision TKA using trabecular metal cones. All patients with a minimum 2-year follow-up were included in the study. Reasons for revision, number of previous surgeries, type of bone defect, and number and type of trabecular cones used were evaluated. Clinical and radiological outcomes were also analyzed as well as complications rates. Results: 35 patients (49 cones) were evaluated with a mean follow-up of 32.1 months (24-62). Most defects were localized in the tibia and were classified as AORI type 3. The rate of osseointegration of the cones was 94%; the complication rate, 20%; and the reoperation rate, 8.5%. The mean KSS increased from 39 preoperatively to 71 at the last follow-up, and the mean VAS from 8 to 2.5. Conclusion: The excellent osseointegration rate (94%), added to the good clinical outcomes, position the trabecular metal cones as an alternative to treat severe bone defects. Level of Evidence: IV

Reemplazo total de rodilla en pacientes con anquilosis. Reporte de tres casos y revisión bibliográfica / Total knee replacement in patients with ankylosis. Report of three cases and literature review

Introducción: El reemplazo total de rodilla en pacientes con anquilosis representa un desafío para el cirujano, tanto por la alta demanda técnica de la cirugía como por la elevada tasa de complicaciones comunicada. El objetivo de este artículo es presentar tres pacientes con anquilosis tratados con un reemplazo total de rodilla y una revisión bibliográfica actualizada. materiales y métodos: Se evaluaron las distintas etiologías, la movilidad preoperatoria, la técnica quirúrgica y el tipo de implante utilizado en cada caso. En el seguimiento, se evaluaron la tasa de complicaciones, el rango de movilidad y la supervivencia del implante. Por último, se realizó una revisión actualizada de la bibliografía. Resultados: Dos pacientes tenían artritis reumatoide juvenil y uno, una secuela de osteomielitis crónica de rodilla. Los pacientes no tenían movilidad articular y sufrían un severo compromiso para realizar las actividades de la vida cotidiana. En los tres pacientes, se efectuó un abordaje pararrotuliano medial seguido de una amplia liberación de partes blandas. En dos casos, se utilizaron prótesis primarias con vástagos y, en el restante, una prótesis de bisagra rotacional. El rango de movilidad alcanzado fue de 90° en promedio y los pacientes refirieron una tasa alta de satisfacción. No se registraron complicaciones. Conclusiones: El reemplazo total de rodilla en pacientes con anquilosis es una opción terapéutica por considerar, y tiene un impacto beneficioso en la calidad de vida. Por la complejidad que representa debe afrontarse como una cirugía de revisión, con una detenida planificación preoperatoria. Nivel de Evidencia: IV

Introduction: Performing a Total Knee Replacement (TKR) in patients with ankylosed knees is technically demanding and associated with considerable complications. The purpose of this study is to report three cases of patients with ankylosed knees treated with TKR and present an updated literature review. Materials and methods: We evaluated etiologies, preoperative range of motion, surgical technique and type of implant utilized in each case. Complications and postoperative range of motion were also analyzed. Radiographs were used to evaluate loosening or osteolysis. Lastly, we performed an updated literature review. Results: The etiologies were juvenile rheumatoid arthritis in two cases and chronic osteomyelitis in one. The patients did not have range of motion at all and the ability to perform daily life activities was severely affected. A medial parapatellar approach was used in all cases followed by an extensive soft tissue release. A primary posterior-stabilized design was used in two cases and a rotating-hinge in one case. The mean postoperative range of motion was 90° and all three patients reported a high satisfaction rate. No complications were reported. Conclusions: TKR in patients with ankylosed knees has substantially improved the clinical outcome and the arc of movement. Due to its complexity, it must be approached as a revision surgery, with careful preoperative planning. Level of Evidence: IV

Surgical Hip Dislocation and Fresh Osteochondral Allograft Transplantation for Femoroacetabular Impingement and Concomitant Chondral Lesion.

Chondral lesions of the hip in young patients are frequently associated with additional articular pathology. Parafoveal osteochondral lesions have been reported to be a manifestation of cam lesions in the setting of femoroacetabular impingement (FAI). Although arthroscopic surgery is useful to treat intra- and extra-articular pathology, large lesions located in areas that are difficult to access represent a limitation of the technique. Open surgical dislocation and osteochondral allograft transplantation (OCA) allow treatment of larger surface areas and underlying morphologic abnormalities such as cam lesions. We present our technique for open surgical dislocation of the hip through a stepped trochanteric osteotomy, osteochondral transplantation of fresh-stored femoral head allograft, and osteoplasty of the head/neck junction.

Alta variabilidad en la indicación, elaboración y aplicación del plasma rico en plaquetas entre los cirujanos de la Asociación Argentina de Artroscopía / Very significant variability in the indication, elaboration and application of platelet-rich plasma among Argentine Association of Arthroscopy physicians

El uso de plasma rico en plaquetas ha crecido exponencialmente en la práctica ortopédica en la última década. Sin embargo, su utilización ha superado en gran medida la evidencia clínica que respalda su uso. El objetivo de este estudio fue identificar y describir las diferencias existentes entre los médicos de la Asociación Argentina de Artroscopía para la indicación, elaboración y aplicación del plasma rico en plaquetas. Se diseñó un cuestionario con catorce preguntas para recolectar información sobre la utilización actual del PRP. La encuesta fue enviada a novecientos veinticinco miembros de la AAA. La tasa de respuesta fue del 36.2% (n=335). De los que utilizan PRP, la mayoría (66%) indicó que realiza entre cero a cuatro aplicaciones mensuales. La localización más habitual en el uso de PRP fue en la rodilla (52%) y la indicación más frecuente fue en tendinopatías (39%), seguido por artrosis (32%). La mayoría de los traumatólogos encuestados no conocía los protocolos de preparación ni la composición final del PRP que utilizaba. Por otro lado, encontramos una variabilidad significativa en la dosis, el número de infiltraciones y el intervalo de tiempo transcurrido entre las diferentes aplicaciones para la misma patología. Es importante destacar que el 50% de los entrevistados refirió no conocer la utilidad de las terapias biológicas o su modo de aplicación. En conclusión, existe una variabilidad muy significativa en la indicación, elaboración y aplicación del PRP entre los médicos de la AAA. Consideramos que identificar este problema a través de la siguiente encuesta es fundamental para impulsar nuevas actividades educativas y de capacitación de los integrantes de la AAA que permita aplicar estas terapias en forma más efectiva y en línea con la mejor evidencia disponible

The use of platelet rich plasma has grown exponentially in orthopedic practice in the past decade. However, its use has far exceeded the clinical evidence supporting its use. The objective of the following study was to identify and describe the differences among the physicians of the Argentine Association of Arthroscopy (AAA) in the indication, preparation and application of platelet-rich plasma. A 14-question questionnaire was designed to collect information on the current use of the PRP. The survey was sent to 925 AAA members. The response rate was 36.2% (n = 335). Of those who use PRP, the majority (66%) indicated that they carry out between 0 to 4 monthly applications. The most frequent location in the use of PRP was in the knee (52%) and the most frequent indication was in tendinopathies (39%), followed by osteoarthritis (32%). Most of the orthopedic surgeons surveyed did not know the preparation protocols or the final composition of the PRP they used. On the other hand, we found significant variability in the dose, the number of infiltrations and the time interval between the different applications for the same pathology. It is important to note that 50% of the interviewees reported not knowing the usefulness of biological therapies or not knowing their mode of application. In conclusion, there is a very significant variability in the indication, elaboration and application of PRP among AAA physicians. We consider that identifying this problem through the following survey is essential to promote new educational and training activities for AAA members that allow applying these therapies more effectively and in line with the best available evidence

Enfermedad de Trevor con compromiso del tendón rotuliano. Reporte de un caso / Trevor disease that compromises the patellar tendon. Case report

La enfermedad de Trevor, o displasia epifisaria hemimélica, se caracteriza por una tumoración o sobrecrecimiento osteocartilaginoso asimétrico epifisario. La presentación clínica es muy variable y depende de la localización de la lesión. Puede ser tratada de manera conservadora, y en casos sintomáticos o de un gran crecimiento, el tratamiento suele ser la resección quirúrgica. Una minuciosa evaluación, con un correcto examen físico e imágenes, es de vital importancia para la planificación y pronóstico de esta patología.Presentamos el caso de un paciente masculino de cuarenta y nueve años con enfermedad de Trevor en la cara anterior de la rodilla que además involucra al tendón rotuliano. Se logró la resección quirúrgica de la lesión conservando la indemnidad del tendón con buenos resultados funcionales. Tipo de estudio: Reporte de Casos. Nivel de evidencia: V

Dysplasia epiphysealis hemimelica, also known as Trevor Fairbank disease, is characterized by asymmetrical osteochondral overgrowth of the epiphyseal cartilage. The clinical presentation of this disease is wide and variable, depending on the site of the lesion. Treatment could be conservative or surgical depending on the size of the lesion or clinical symptoms. A proper physical examination and imaging studies is vital for the preoperative planning and prognosis of this disease.We present a 49-years old male with Trevor's disease located in the tibial tuberosity of the knee that compromises the patellar tendon. The surgical excision of the lesion was achieved preserving integrity of the tendon with very good clinical outcome. Type of study: Case Report. Level of Evidence: V