Outcomes of acute fix and replace in complex hip posterior fracture dislocations with acetabular fractures : a minimum of 3 years follow-up.

Simultaneous open reduction and internal fixation of acetabular fractures combined with total hip replacement (THR) have some potential advantages over the more traditional approach in specific patient subgroups. The aim of this study was to evaluate the outcomes of patients who had the "fix and replace" construct for complex posterior hip fracture dislocation treated at our tertiary referral pelvic unit. This was a retrospective review of prospectively collected data for patients who underwent this procedure between 2011-2018 with a minimum of 3 year follow up. Data collected were: patient demographics, date of injury, injury pattern, fixation methods, type of implants used and post-operative complications. There were 14 patients with a mean age of 63.2 years (range 43-94 years) who underwent this procedure between 2011-2018. The mean follow up was 58 months. All cases involved a posterior wall fracture and six cases had an associated posterior column involvement. Femoral head autograft was used in 13 patients (93%). Six patients (43%) had their posterior acetabular wall reconstructed with a femoral head autograft. Seven patients had a fully cemented (THR) and the seven others had a hybrid implant. There were no surgical related complications. From our study we can conclude that the acute "fix and replace" construct for complex posterior hip fracture dislocation yields good clinical outcomes in the short and medium term with low complication rate. It is best performed by a surgeon who specialises in both acetabular and hip arthroplasty surgery.

Fractured Femoral Stems in Primary and Revision Hip Arthroplasties Revisited: Wrightington Experience.

BACKGROUND: The aim of this study is to present our experience in managing fractured femoral stems over the last 10 years for both primary and revision stems at our tertiary unit focusing on modes of failure and operative techniques. METHODS: This is a retrospective consecutive study of all patients with fractured femoral stems that were operatively managed in our unit between 2008 and 2018. Detailed radiographic evaluation (Paprosky classification) was undertaken and data collected on operative techniques used to extract distal fractured stem fragments. RESULTS: Thirty-five patients (35 hips) were included (25 men/10 women) with average age at time of presentation of 68 years (range, 29-93). Average body mass index was 30 (standard deviation, 3.8; range, 22.5-39). There were variety of stems both contemporary and historical, primary and revision cases (15 hips polished tapered cemented stems, 10 hips composite beam and miscellaneous stems, and 10 revision hip stems). The predominant mechanism of failure was fatigue due to cantilever bending in distally fixed stems. Surgical techniques used to extract distal fragment were drilling technique in 2 hips, cortical window in 13 hips, extended trochanteric osteotomy (ETO) in 5 hips, and proximal extraction in 15 hips. CONCLUSION: When faced with a contemporary fractured stem, drilling techniques into the distal fragment are unlikely to succeed. If a trochanteric osteotomy had been used at time of index surgery, this could be used again to aid proximal extraction with conventional revision instrumentations. The cortical window technique is useful but surgically demanding technique that is most successful in extracting polished tapered fractured stems particularly when an ETO is not planned for femoral reconstruction. Use of trephines can be useful for removal of longer, uncemented stems. Finally, an ETO might be necessary when other techniques have failed.

A comprehensive analysis on contributing factors for varus or valgus malposition of femoral stems in uncemented total hip arthroplasty via DAA.

Background: Varus or valgus malposition of uncemented femoral stems have been described to have detrimental effects for long term implant survival. Various pre- and intra-OP factors have been suggested to be relevant, one of them being the approach to the hip. The aim was to investigate several pre- and intra-OP factors associated with femoral stem malpositioning in a large series of DAA hips. Methods: A series of 400 consecutive patients (416 hips) who underwent navigated (Brainlab) cementless Total Hip Arthroplasty (THA) in 2022 (Corail or Actis stem DePuy Synthes) via a direct anterior approach (DAA) was analyzed. Preoperative data were collected based on patients' demographics, radiographic information [critical trochanteric angle (CTA), centrum collum diaphyseal (CCD) angle, greater trochanter overhang, femoral neck resection angle, femoral neck resection height and Door classification], and these were correlated with the postoperative stem position. Univariable and multivariable linear regression were carried out to determine significant factors that contribute to varus and valgus stem malalignment. Results: With the DAA approach, 56.5 % of stems were placed in an optimal neutral position, 38.4 % were in acceptable position of 0.1°-2° varus/valgus and only 5 % had a deviation larger than 2° varus/valgus. The critical trochanteric angle (CTA) was statistically significant in determining varus stem placement whereas centrum collum diaphyseal angle (CCD) was found to affect valgus stem malpositioning. All other factors have shown no relevant effect on stem placement using stepwise regression method. Conclusion: In DAA, 95 % of stems were found in a varus/valgus position of 2° or less. In pre-operative measurement, only femoral morphology (e.g. CTA & CCD) were found to be relevant, affecting varus/valgus stem malposition. All other tested modifiable and non-modifiable factors had no significant effect. Therefore, pre-OP templating including measurement of CTA and CCD, intra-operative assessment as well as proper operative techniques are paramount to prevent excessive varus/valgus mal-position of femoral stem in DAA.

A Systematic Review of Human Amnion Enhanced Cartilage Regeneration in Full-Thickness Cartilage Defects.

Cartilage defects present a significant challenge in orthopedic medicine, often leading to pain and functional impairment. To address this, human amnion, a naturally derived biomaterial, has gained attention for its potential in enhancing cartilage regeneration. This systematic review aims to evaluate the efficacy of human amnion in enhancing cartilage regeneration for full-thickness cartilage defects. An electronic search was conducted on MEDLINE-PubMed, Web of Science (WoS), and the Scopus database up to 27 December 2023 from 2007. A total of 401 articles were identified. After removing 125 duplicates and excluding 271 articles based on predetermined criteria, only 5 articles remained eligible for inclusion in this systematic review. All five eligible articles conducted in vivo studies utilizing rabbits as subjects. Furthermore, analysis of the literature reveals an increasing trend in the frequency of utilizing human amnion for the treatment of cartilage defects. Various forms of human amnion were utilized either alone or seeded with cells prior to implantation. Histological assessments and macroscopic observations indicated usage of human amnion improved cartilage repair outcomes. All studies highlighted the positive results despite using different forms of amnion tissues. This systematic review underscores the promising role of human amnion as a viable option for enhancing cartilage regeneration in full-thickness cartilage defects, thus offering valuable insights for future research and clinical applications in orthopedic tissue engineering.

A Rare Presentation of Patella Button Aseptic Loosening After a Total Knee Replacement Without Evidence of Radiographic Loosening.

Patella resurfacing in total knee replacement (TKR) has been shown to reduce the rate of anterior knee pain, but there are complications from patella resurfacing. A 54-year-old male underwent a left primary TKR with patella resurfacing 15 years ago. He developed spontaneous progressive anterior knee pain for six months. At revision surgery, his patella button was found to be loose. Loosening of a three-peg patella button is rare. A high index of suspicion of patella button loosening should be suspected in patients who present with anterior knee pain after patella resurfacing.

The Modified Spare Piriformis and Internus, Repair Externus Approach for Hip Arthroplasty.

We present the case of an 80-year-old Malaysian gentleman who sustained a displaced intracapsular neck of femur (NOF) fracture and underwent a modified SPAIRE (Sparing Piriformis and Internus, Repair Externus) approach for total hip replacement (THR). The standard approach used in our hospital for THR in NOF fractures is the modified Hardinge approach to the hip. We used this modified SPAIRE approach as this patient lives in a 'Mahjong' center and always sits cross-legged on the floor. Therefore, he is at increased risk of an anterior dislocation. This approach is a modification of the standard SPAIRE approach popularized by the Exeter Hip Unit, United Kingdom. In this report, we describe the modification of the SPAIRE approach that has not been described before and the outcome for this patient.

Custom-Made Articulating Spacer (CUMARS): The Resolution of Periosteal Reaction and Femur Remodelling in Periprosthetic Hip Infection.

Periprosthetic joint infection (PJI) is one of the most common complications after total hip arthroplasty (THA). Two-stage revision surgery is one of the treatment options for PJI, however, it has been associated with poor patient tolerance, reduced patient mobility, and periarticular tissue contracture leading to difficulty during second-stage reconstruction. The custom-made articulating spacer (CUMARS) was developed to provide an alternative that is better tolerated and to reduce the complexity of second-stage reconstruction. This study details the treatment of a patient with PJI post-THA with significant periosteal reaction using a CUMARS construct, which enabled immediate post-operative weight bearing, eventual eradication of infection, restoration of femoral bone stock, and avoidance of second-stage reconstruction.

Outcomes of Impaction Bone Grafting in the Management of Acetabular Defects with the Use of Uncemented Acetabular Cups: Do Autografts and Irradiated Femoral Head Allografts Integrate?

Introduction: Acetabular impaction bone grafting (AIBG) has been used widely to reconstruct acetabular defects in complex primary and revision cases. The aim of this study was to look at the outcomes AIBG using either frozen irradiated femoral head allografts or autografts with uncemented acetabular cups. Method: We retrospectively reviewed 38 patients who had AIBG and uncemented cup reconstruction of the acetabulum performed between 2008 and 2021 for complex primary and revision surgery. Graft incorporation, radiological loosening and cup migration were evaluated in follow-up X-rays. Result: There were 24 complex primary and 14 revision total hip arthroplasty. Autografts were used in 10 hips with smaller defects, while 28 hips with larger defects required frozen irradiated femoral head allografts. Using Paprosky classification to evaluate acetabular defects; 8 patients were classified as 2A, 12 as 2B, 7 as 2C, 8 as 3A and 3 as 3B. The Kaplan-Meier survival rate for AIBG with uncemented cups in our series is 89.70% in 10 years. Acetabular cup position was anatomically restored in all autograft AIBG cases and in 25 out of 28 in the allograft group. The mean pre-operative Oxford Hip Score (OHS) was 19 (range 10-24) and post-operative OHS was 39 (range 21-48) (p < 0.001). Conclusions: The mid- to long-term results for AIBG and uncemented acetabular cups is good. With newer and more porous uncemented cups especially revision cups, it may serve as an extended indication to achieve solid fixation together with AIBG technique in managing acetabular defects of ≤ 3A.

Effectiveness of an Antibiotic-impregnated Bioabsorbable Carrier for the Treatment of Chronic Intramedullary and Diffuse Osteomyelitis.

Aim: The surgical management of chronic intramedullary osteomyelitis involves debridement of affected non-viable tissue and the use of antibiotics. Where surgery leaves a cavity, dead-space management is often through antibiotic-impregnated bone cement. These depots of local antibiotics are variable in elution properties and need removal. We review our unit's experience using a bioabsorbable synthetic calcium sulphate to deliver gentamicin as an adjunct in the treatment of osteomyelitis involving the medullary canal. Materials and methods: We retrospectively reviewed 34 patients with chronic osteomyelitis who were treated using this method in our institute. Variables recorded included aetiology, previous interventions, diagnostic criteria, radiological features, serology, and microbiology. The Cierny-Mader system was used to classify. Follow-up involved a survival analysis to time to recurrence, clinical and functional assessment (AOFAS-Ankle/IOWA knee/Oxford Hip/DASH scores) and a general health outcome questionnaire (SF36). The primary outcome measure was clinical recurrence of infection. Results: There were 24 male and 10 female patients. The mean age at presentation was 47 years (20-67). Clinical, laboratory, radiological, and patient reported outcomes were obtained at a median follow-up of 2.5 years (1.4-6.6 years). The bones involved were the femur (14, 41%), tibia (16, 47%), radius (1, 3%), and humerus (3, 9%). There were 13 cases classified as Cierny-Mader stage IV (diffuse with intramedullary osteomyelitis) and 21 cases as Cierny-Mader stage I. The median Oxford Hip score was 38 (11 patients, range 9-48). The median AOFAS score was 78 (14 patients, range 23-100). The median IOWA knee score was 71 (25 patients, range 22-95). The median DASH score was 33 (2 patients, range 1.7-64.2). There were two recurrences. The treatment success to date is 94%. Conclusion: In our series of patients, bioabsorbable carriers of antibiotics appear to be effective adjuncts to surgical treatment of osteomyelitis and were associated with high clinical success rates. How to cite this article: Selvaratnam V, Roche A, Narayan B, et al. Effectiveness of an Antibiotic-impregnated Bioabsorbable Carrier for the Treatment of Chronic Intramedullary and Diffuse Osteomyelitis. Strategies Trauma Limb Reconstr 2023;18(3):148-154.

Outcome of Arthroscopic All-Inside Posterior Cruciate Ligament Reconstruction Using the Posterior Trans-Septal Approach.

Introduction: Posterior Cruciate Ligament (PCL) reconstruction is a complex surgical procedure and often challenging. The newer posterior trans-septal portal technique is thought to make tibial tunnel preparation easier with better visualization of the tibial attachment site. It is also thought to lower the risk of neurovascular injuries. The aim of this study was to evaluate the functional and clinical outcomes of patients who underwent arthroscopic all-inside PCL reconstruction using the posterior trans-septal portal at our institute. Methods: This was a retrospective study with prospectively collected data between 2016 and 2020. Data collected were age, gender, types of graft used, range of movement, posterior drawer test grade, KOOS score, Lysholm knee scoring scale, and post-operative complications. All patients underwent pre- and post-operative PCL rehabilitation. Results: A total of 36 patients (26 males and 10 females) were identified from our database. The mean age was 35.2 years. Mean time from injury to surgery was 20 months. Mean follow-up was 41.2 months (range, 13-72 months). Twenty cases involved multi-ligament injuries and another 16 patients had isolated PCL injury. Post-operative mean posterior drawer test grade improved from 2.7 to 0.7 (p < 0.001). Knee range of movement was 116.3 degrees pre-operatively and 115.6 degrees postoperatively (p = 0.814). Lysholm knee scoring scale improved from 50.9 to 91.0 (p < 0.001). KOOS score improved from 65.1 to 77.2 (p = 0.196). One patient required manipulation under anesthesia for stiffness. No patients needed any additional surgical procedures. All PCLs were clinically intact at the final follow-up. Conclusion: Greater visualization of the PCL tibial attachment minimizes the 'killer turn' giving a huge advantage to this technique. Arthroscopic all-inside PCL reconstruction using the posterior trans-septal portal technique is a safe, reliable and reproducible procedure. From our study, it shows that post-operative clinical and functional outcomes improved significantly.

Survival akin to injury, hospitalized patients with acute kidney injury based on the AKIN classification.

INTRODUCTION: Acute kidney injury (AKI) is often associated with severe consequences. The aim of the study was to determine whether the acute kidney injury network classification predicts hospital stay, renal recovery and mortality. METHODS: Hospitalized patients who were referred to the nephrology service over 6 months were studied retrospective with further 12 months prospective follow up. Statistical analysis was performed on their demography and outcome. RESULTS: Among the 238 patients who were referred, 166 had AKI, median age 74 years and 32% were diabetics. 10% (n = 17) required acute renal replacement therapy. The overall all-cause mortality of AKI group (n = 166) compared to non-AKI group (n = 72) at 1 year was 55% as opposed to 27.8% (p < 0.001). There was a significant statistical difference in the composite outcome and survival between the AKI stages in terms of renal recovery (p = 0.018). The AKI group had a median 8 day increase in length of stay compared to the non-AKI group (20 vs. 12 days; p = 0.0175). However, there was no significant statistical difference between pre and post admission AKI (p value = 0.191). CONCLUSION: The AKIN staging of AKI predicts both early and late mortality. AKI has a major impact on inpatient and 1-year-survival, renal recovery and length of stay. AKI and renal recovery following the insult were independent prognosticators. Early identification and management of AKI cases can help to prevent progression of the severity of AKI and therefore, mandates timely referral to nephrology team to prevent progression of AKIN class and its consequences.

Robotic Assisted Patellofemoral Joint Replacement: Surgical Technique, Tips and Tricks.

In this article we wish to provide MAKO robotic knee users a surgical guide including tips and tricks on performing MAKO robotic-assisted patellofemoral joint replacements. The senior authors in this paper from the Exeter Knee Reconstruction Unit, United Kingdom are highly experienced MAKO users who have been performing MAKO assisted Patellofemoral joint replacements since 2017.

A Rare Case of Open 3A VTB2W Periprosthetic Fracture around a Total Hip Arthroplasty.

Introduction: The incidence of periprosthetic fracture (PPF) around a total hip arthroplasty (THA) continues to increase with the rise of number of THA performed. We present a rare case of a 73-year-old man who sustained an open periprosthetic femur fracture around a THA. Case Report: This gentleman sustained an open PPF around a fully cemented THA after he lost control and fell off his bicycle. After thorough surgical debridement, internal fixation with double plating was performed and the fracture went on to unite with an excellent patient reported outcome score. To the best of our knowledge, this is the only reported open 3A VTB2W PPF THA in the literature. Conclusion: Open PPF around a THA is a rare and uncommon occurrence. Principles of open fracture management should be continued and we recommend urgent surgery to reduce the risk of post-operative infection. Open VTB2W PPF should be fixed with double plating if the bone cement interface is intact and the fracture can be anatomically reduced. Double plating gives additional rotational stability and allows early weight bearing post-operatively.

Liverpool carpal tunnel scoring system to predict nerve conduction study results: A prospective correlation study.

BACKGROUND: Carpal tunnel syndrome (CTS) is one of the most common peripheral nerve compressive neuropathies. The clinical symptoms and physical examinations of CTS are widely recognised, however, there is still debate around what is the best approach for assessment of CTS. Clinical assessment is still considered the gold standard, however, controversies do exist regarding the need for investigations such nerve conduction studies (NCS) to aid with management decisions. AIM: To correlate the severity of NCS results to a scoring system which included symptoms, signs and risk factors. METHODS: This was a prospective correlation study. We scored patients' signs and symptoms using our CTS scoring system. This was then correlated with the findings of the NCS. The scoring system included - four symptoms (2 Katz hand diagrams - one for tingling and one for numbness; nocturnal paresthesia and bilateral symptoms) and four clinical signs (weak thumb abduction test; Tinel's sign; Phalen sign and hypoalgesia in median nerve territory) and two risk factors (age more than 40 years and female sex). We classified the NCS results to normal, mild, moderate and severe. RESULTS: There were 61 scores in 59 patients. The mean scores for the categories were as follows: 6.75 for normal NCS; 5.50 for mild NCS; 9.17 for moderate NCS and 9 for severe NCS. All scores of 8 or more matched with NCS results of moderate and severe intensity apart from three scores which were greater than seven that had normal NCS. Eta score was 0.822 for the CTS score being the dependent value and the NCS category being the independent variable showing a strong association between the scoring system and the NCS group. CONCLUSION: We feel that this simple scoring system can be used to predict and correlate the severity of NCS in patients with CTS.

Cement-in-cement revision of the femur in infected hip arthroplasty in 89 patients across two centres.

AIMS: Femoral cement-in-cement revision is a well described technique to reduce morbidity and complications in hip revision surgery. Traditional techniques for septic revision of hip arthroplasty necessitate removal of all bone cement from the femur. In our two centres, we have been using a cement-in-cement technique, leaving the distal femoral bone cement in selected patients for septic hip revision surgery, both for single and the first of two-stage revision procedures. A prerequisite for adoption of this technique is that the surgeon considers the cement mantle to be intimately fixed to bone without an intervening membrane between cement and host bone. We aim to report our experience for this technique. METHODS: We have analyzed patients undergoing this cement-in-cement technique for femoral revision in infection, and present a consecutive series of 89 patients. Follow-up was undertaken at a mean of 56.5 months (24.0 to 134.7) for the surviving cases. RESULTS: Seven patients (7.9%) required further revision for infection. Ten patients died of causes unrelated to their infection before their two-year review (mean 5.9 months; 0.9 to 18.6). One patient was lost to follow-up at five months after surgery, and two patients died of causes unrelated to their hip shortly after their two-year review was due without attending. Of the remaining patients, 69 remained infection-free at final review. Radiological review confirms the mechanical success of the procedure as previously described in aseptic revision, and postoperative Oxford Hip Scores suggest satisfactory functional outcomes. CONCLUSION: In conclusion, we found that retaining a well-fixed femoral cement mantle in the presence of infection and undertaking a cement-in-cement revision was successful in 82 of the patients (92.1%) in our series of 89, both in terms of eradication of infection and component fixation. These results are comparable to other more invasive techniques and offer significant potential benefits to the patient. Cite this article: Bone Joint J 2022;104-B(2):212-220.

Robotic-Assisted Patellofemoral Replacement-Correlation of Preoperative Planning with Intraoperative Implant Position and Early Clinical Experience: A Minimum 2-Year Follow-up.

Patello-femoral arthroplasty (PFA) is successful in a selected group of patients and yields a good functional outcome. Robotic-assisted knee arthroplasty has been shown to provide better implant positioning and alignment. We aim to report our early outcomes and to compare Mako's (Robotic Arm Interactive Orthopaedic System [RIO]) preoperative implant planning position to our intraoperative PFA implant position. Data for this study was prospectively collected for 23 (two bilateral) patients who underwent robotic-assisted PFA between April 2017 and May 2018. All preoperative implant position planning and postoperative actual implant position were recorded. Presence of trochlear dysplasia and functional outcome scores were also collected. There were 17 (two bilateral) female and 6 male patients with a mean age of 66.5 (range: 41-89) years. The mean follow-up period was 30 (range: 24-37) months. Eighteen knees (72%) had evidence of trochlear dysplasia. The anterior trochlear line was on average, 7.71 (range: 3.3-11.3) degrees, internally rotated to the surgical transepicondylar axis and on average 2.9 (range: 0.2-6.5) degrees internally rotated to the posterior condylar line. The preoperative planning range was 4-degree internal to 4-degree external rotation, 4-degree varus to 6-degree valgus, and 7-degree flexion to 3-degree extension. The average difference between preoperative planning and intraoperative implant position was 0.43 degrees for rotation (r = 0.93), 0.99 degrees for varus/valgus (r = 0.29), 1.26 degrees for flexion/extension (r = 0.83), and 0.34 mm for proudness (r = 0.80). Six patients (24%) had a different size component from their preoperative plan (r = 0.98). The mean preoperative Oxford Knee Score (OKS) was 16 and the mean postoperative OKS was 42. No patient had implant-related revision surgery or any radiological evidence of implant loosening at final follow-up. Our early results of robotic PFA are promising. Preoperative Mako planning correlates closely with intraoperative implant positioning. Longer follow-up is needed to assess long-term patient outcomes and implant survivorship.

Circumferential encasement of the spinal cord in a patient with rheumatoid arthritis.

Myelopathy associated with rheumatoid arthritis (RA) usually involves the craniocervical junction or mid-cervical spine. We present an unusual case of an encasing circumferential inflammatory mass at the cervico-thoracic junction down to the mid-thoracic spine. The need to consider inflammatory lesions even in unusual anatomical locations in patients with RA is illustrated.

Paediatric open tibial fractures. Do children require a modified approach to that advised by the British Orthopaedic Association and British Association of Plastic Reconstructive and Aesthetic Surgeons in the UK?

This study reviews the outcomes of paediatric open tibial fractures treated at a level 1 trauma centre using the British Orthopaedic Association/British Association of Plastic Reconstructive and Aesthetic Surgeons standards and compares the results to management in adults. This was a retrospective study of 60 consecutive cases over a 9-year period. The variables recorded include grade of injury, contamination and pattern of fracture. Other data recorded include time at which antibiotics were given, time to index surgery, type of skeletal fixation and time to definitive cover. Outcomes sought were infection rate, time to union, problems with union and any additional unplanned surgery. The mean time to administration of antibiotics was 3.4 h after injury with a range of 0.35-17 h. The mean time to debridement was 13.4 h (range 1-32 h, SD 7.7). The mean time to union was 4.3 months (range 1.3-15 months). There were five cases of deep infection (8.3%) and three cases of superficial infection (5%). There were no significant differences between timings of antibiotic administration, hours to debridement or days to definitive closure between those cases which became infected and those which did not. This retrospective review of a consecutive series of paediatric open tibial fractures shows a close parallel of outcomes to that from adult centres in the UK using the same standards of care. This strengthens the recommendation that, until the availability of data to suggest otherwise, open tibial fractures in children should follow the same recommendations as suggested for adults. The greater healing potential in children, seen in multiple examples of closed long bone fractures, appears to be attenuated in the higher grades of the open tibial fracture.

Outcome of revision surgery in recurrent dislocation of primary total hip arthroplasty.

BACKGROUND: The cause of recurrent dislocation following primary total hip arthroplasty (THA) is multifactorial. A re-dislocation rate of up-to 34% following revision is reported. The aim of this study was to determine the re-dislocation rates following revision for recurrent THR dislocation. METHODOLOGY: Patients who underwent revision for recurrent dislocation between January 2008 and January 2015 were identified. We identified the date and type of primary implant, overall number and reasons for dislocation, revision implant details and complication data. RESULTS: Over an 8-year period, 24 patients underwent revision. The median age was 77 (68-85) years, median time to first dislocation was 78 (23-160) months and median number of dislocations was 3 (2-4) with a mean follow-up of 18 months. Socket Mal-Orientation (10) and Abductor deficiency (5) were the main causes of recurrent dislocation. 21 patients (88%) underwent revision of both components, 1 patient underwent isolated cup revision and 2 patients had revision of acetabular component with insertion of a BioBall. There were no dislocations within 90 days of revision surgery. 4 patients had late dislocations (3 recurrent, 1 isolated). There was no significant increase risk of dislocation after revision surgery in the neck of femur group (p = 0.467). CONCLUSIONS: We report favourable outcomes for revision of both components for recurrent dislocation with no dislocations within 90 days. The overall late dislocation rate was 16.7%, however, these patients have settled following closed reduction. Due to its multifactorial aetiology, both component revision can be considered in this patient population.

Cortical strut allografts in salvage revision arthroplasty: Surgical technique and clinical outcomes.

BACKGROUND: The aim of this study was to present our clinical outcomes and surgical technique in strut allografts preparation using staggered holes to enhance osteointegration and demineralised bone matrix (DBM) as an adjunct to cortical strut allografts in salvage revision arthroplasty patients. METHODS: Retrospective consecutive series of patients who required strut allograft femoral reconstructions with minimum 2 years follow up between 2012 and 2018. Frozen washed irradiated, cortical struts were used and prepared adding 2 mm staggered drill holes along the length of the strut and applying DBM paste on the graft-host interface. Outcome measures included radiographic strut union, graft resorption, infection and complications. RESULTS: 15 patients included; 3 males and 12 females with median age 72 years (range 60-93). All had significant bony defects (Paprosky III/IV in 12 cases including 3 cases of periprosthetic hip fractures and further 3 cases of periprosthetic knee fractures around revision hinged implants). At final follow up, median 3.8 years (range 2.7-7.2), 14/15 (93.3%) struts had united at a median 6 months (range 5-8), complete incorporation with cortical round-off was seen at median 12 months (range 8-48) in 12/15 (80%) struts, 2/15 (13.3%) show radiographic evidence of proximal minimal graft resorptions although the remainder of the strut had integrated and were asymptomatic. There were no cases of infection. CONCLUSIONS: Use of strut allografts helps to reconstruct bone defects, restore bone stock, and provide stable fixation for complex patterns of periprosthetic fractures around hip/knee implants and salvage revision cases with 93.3% union rate at median 6 months.