Clinical outcomes of primary total knee arthroplasty in non-syphilitic neuroarthropathy of the knee.

PURPOSE: Total knee arthroplasty (TKA) in syphilitic neuroarthropathy using earlier implant designs was associated with poorer outcomes. Literature on TKA for non-syphilitic neuroarthropathy using modern contemporary prosthesis is scarce. We aim to analyse the clinical and radiological outcomes of TKA in neuropathic joints. METHODS: A final cohort of 17 patients (21 knees) with the diagnosis of neuropathic joint undergoing primary TKA between January 2013 to January 2019 were included in the study. The preoperative ambulatory status, range of motion, type of prosthesis, level of constraint and any augmentation used were retrieved from medical records. Radiological evaluation includes Koshino's staging, the magnitude of deformity defined by the Hip-Knee-Ankle (HKA) angle, and any progressive loosening. Pre and postoperative functional scores were obtained by the Knee Society (KSS) and Knee Society Functional Score (KSS-F). Any complications or reoperation were noted till the final follow-up. Preoperative and follow-up functional scores, HKA and range of motion were compared using the paired Samples test. RESULTS: The mean follow-up was 40.2 months (range, 15 to 75 months). Preoperatively, according to the Koshino staging, five knees were in stage 3 (23.8%). The mean HKA angle in valgus knees was 23.60 (range, 11.10 to 42.50) and for the varus knees was 19.30 (range, 4.90 to 39.60). The prosthesis used were posterior stabilized in 7 knees (33.3%), varus-valgus constrained in five knees (23.8%) and a rotating hinge was required in nine knees (42.8%). Metaphyseal sleeves were used along with hinge prosthesis in six knees (28.6%). The mean arc of motion improved from 102.4 ± 22.7 degrees to 105.7 ± 15.5 degrees postoperatively (p = 0.27). The knee society and knee society functional scores improved from 23.3 ± 9.3 and 28.3 ± 12.2 preoperatively to 81.1 ± 5.4 and 80.4 ± 8.5 during the follow up respectively (p < 0.001). There were no progressive radiolucent lines in any knees at the final follow-up. One patient had intraoperative bony medial collateral ligament injury, one patient had deep vein thrombosis after five days from the index surgery and another had postoperative periprosthetic tibial shaft fracture. CONCLUSION: According to our study, the clinical outcomes of TKA for neuroarthropathy show significant improvement with the diagnosis of non-syphilitic neuroarthropathy, utilization of modern constrained prostheses, and early rehabilitation, at medium-term follow-up. Tibial and femoral stems are preferred for equal stress distribution and to prevent early loosening.

Comparative analysis of 'functional excision' of heterotopic ossification around the hip - computed tomography (CT) navigation guided versus conventional excision.

PURPOSE: We aim to analyse and compare the efficacy of the excision of HO around the hip with and without CT-guided navigation. We also aim to compare the functional outcome between CT navigation guided versus conventional excision of HO. PATIENTS AND METHODS: This study is a retrospective analysis of prospectively collected data from 2015 to 2022. There were 23 patients (24 hips) in the final cohort. Intraoperative CT navigation guided excision was performed in 7 hips and conventional excision of HO was done in 17 hips. The HO was classified by Brooker's grading in radiographs. CT scan was taken preoperatively in all patients to exactly identify the volume, location and preoperative planning. The functional outcome was analysed according to Harris Hip Score (HHS) and International Hip Outcome Tool (iHOT) for self-ambulatory patients and improvement in the sitting or nursing care was assessed in patients mobilising with wheelchair or walker support. Any complications or recurrence noted postoperatively and in follow-up were recorded. RESULTS: The mean follow-up was 41.2 months in the CT navigation-guided excision group and 55 months in the conventional excision group. According to Brooker's grading, grade IV was present in 20 hips and grade III in four hips. Twelve patients were self-ambulatory and the other 12 patients were requiring support for mobilisation. There was a significant improvement in the HHS from 21.3 ± 3.7, 18.3 ± 2.5 preoperatively to 75.2 ± 8.3, 72.2 ± 4.3 postoperatively in the CT navigation guided and conventional group respectively (p < 0.001) in the self-ambulatory group. There was one anterior wall and one partial posterior wall fracture in the conventional group. One patient in the conventional group had a deep infection and recurrence. One patient had a superficial infection and another had superficial vein thrombosis in the CT guided excision group. CONCLUSION: Intraoperative CT navigation helps to exactly localize the HO and facilitates safe excision. Functional excision of the HO leads to better nursing care and functional outcomes between both groups.

Comparison of imageless robotic assisted total knee arthroplasty and conventional total knee arthroplasty: early clinical and radiological outcomes of 200 knees.

The aim of this study was to compare the short term clinical and radiological outcomes of imageless robotic and conventional total knee arthroplasty (TKA) and to estimate the accuracy of the two techniques by analysing the outliers after TKA. We have evaluated 200 consecutive knees (158 patients), 100 knees undergoing robotic TKA, and 100 knees treated with conventional TKA. Demographic parameters like age, gender, body mass index, diagnosis and range of motion were obtained. Knee society score (KSS) and Knee society functional score (KSS-F) were used for clinical evaluation. Mechanical alignment (Hip-knee-ankle angle), proximal tibial angle (MPTA), distal femoral angle (LDFA) and tibial slope were analysed for radiological results and outliers were compared between both groups. Outliers were defined when the measured angle exceeded ± 3° from the neutral alignment in each radiological measurement on the final follow-up radiograph.The minimum follow-up was 6 months (range, 6 to 18 months). The preoperative mean HKA angle was 169.7 ± 11.3° in robotic group and 169.3 ± 7.3° in conventional group. There was significant improvement in HKA, LDFA, MPTA and tibial slope compared to the preoperative values in both the groups (p < 0.01). The number of HKA, LDFA and tibial slope outliers were 31, 29 and 37, respectively, in the conventional group compared to 13, 23 and 17 in the robotic group (p < 0.01). There was a significant improvement in the KSS and KSS-F functional scores postoperatively in both the groups (p < 0.01). However, there was no significant difference in the functional scores between the groups postoperatively (p = 0.08). This study showed excellent improvement with both imageless robotic and conventional TKA, with similar clinical outcomes between both groups. However, radiologically robotic TKA showed better accuracy and consistency with fewer outliers compared with conventional TKA.

Outcomes of conversion total hip arthroplasty for failed fixation of intertrochanteric fractures with monoblock distal-loading reconstruction stem.

PURPOSE: The aim of our study was to analyze the clinical and radiological outcomes of conversion total hip arthroplasty (THA) for failed fixation of proximal femur fractures with monoblock grit-blasted titanium reconstruction stem (Wagner self-locking stem, Zimmer). PATIENTS AND METHODS: Thirty-nine patients were included in this retrospective analysis undergoing conversion THA for failed cephalomedullary nail or dynamic hip screw fixation for intertrochanteric fractures from January 2017 to January 2022. The clinical evaluation was done using Harris hip score. The radiological outcomes measured were subsidence, level of osteointegration, stem-canal fill ratio and heterotopic bone formation. The complications were noted postoperatively and during the follow-up. RESULTS: The mean follow-up at the end of the study was 27.8 months (range, 14-72 months). There was a significant improvement in the Harris hip score over serial follow-ups (p < 0.001), but after 2 years, there was no statistically significant difference (p = 0.46). According to Engh's criteria, stable ingrowth was noted in 35 stems, fibrous stable ingrowth was noted in 4 stems and no patients had progressive subsidence and unstable stem. The mean stem-canal fill percentages were 91.8 ± 5.4% at the mid-stem and 80.3 ± 11.5% at the stem tip. Heterotopic ossification Brooker grade 2 was noted in 8 patients, and no patients had grade 3 or 4 heterotopic ossification. There were 7 (17.9%) intraoperative periprosthetic fractures, and greater trochanteric avulsion was noted in 2 patients in the follow-up. CONCLUSION: Conversion THA using monoblock tapered distal loading stems bypasses the calcar deficiency and gives stable fixation in failed fixation of intertrochanteric fractures. It gives good radiological outcome and significant improvement in the clinical outcomes compared to the preoperative disability. However, caution should be noted for risk of intraoperative periprosthetic fractures in this subgroup of patients.

Takotsubo syndrome after bilateral simultaneous total knee arthroplasty - A case report.

Introduction: Cardiac complications represents a major cause of morbidity and mortality especially after bilateral simultaneous total knee arthroplasty (BS-TKA). Takotsubo syndrome after BS-TKA has not been described in the literature. Case presentation: A 60 years-old women underwent BS- TKA and she suddenly developed bradycardia and hypotension after second knee wound closure. The electrocardiography revealed ST elevation and echocardiography showed apical hypokinesia of left ventricle. Coronary angiography revealed normal epicardial coronaries and a provisional diagnosis of Takotsubo cardiomyopathy was made. Serial ECGs revealed resolution of ST elevation and normal LV function within 5 days. On one-year follow up, she was able to do all her normal activities, and 12-lead electrocardiography were back to normal. Conclusion: Cardiac complications represents a major cause of morbidity and mortality especially after BS-TKA. Surgeons must be vigilant in the postoperative period for any likely precipitating factors of stress induced cardiomyopathy. Takotsubo syndrome should be considered as a differential diagnosis with features of acute coronary syndrome in elderly post-menopausal patients.

Prophylactic Common Peroneal Nerve Decompression Avoids Nerve Palsy in Total Knee Arthroplasty for Severe Fixed Valgus Deformity: A Report of Four Cases and Review of Literature.

Common peroneal nerve (CPN) injury is a serious complication following total knee arthroplasty (TKA). We aim to report four patients (five knees) who underwent prophylactic peroneal nerve decompression for severe rigid valgus deformity with or without associated fixed flexion deformity that was not correctable under anaesthesia. The preoperative deformity of 31.1° valgus by femorotibial angle (range 22.6-37.9°) improved to 7.1° valgus (range 4.3-9.1°) postoperatively (p < 0.05). For two knees, varus-valgus constrained was used due to medial laxity and the other three had posterior-stabilised prosthesis. All four patients had normal motor or sensory nerve function of the CPN nerve postoperatively. There was a significant improvement in the functional outcome by knee society score and knee society functional score from 17.8 ± 6.8, 25 ± 16.2 to 84 ± 8.7, 83 ± 10.3, respectively (p < 0.05). No complications were noted in the mean follow-up of 1.2 years. Prophylactic peroneal nerve decompression allows safe, adequate and optimal lateral soft-tissue release. It is effective in preventing common peroneal nerve palsy in high-risk patients like severe valgus and flexion deformity during total knee arthroplasty.

Pain Management in Osteoporosis.

The most prevalent metabolic bone disease, osteoporosis, is characterized by a decrease in bone mineral density and alterations to the bone's microstructure, both of which can result in fragility fractures. It affects a significant section of the population. Acute or chronic pain from these fractures is typical in elderly adults with other coexisting conditions. Since the antiresorptive medication only partially reduces pain, other analgesics are required for effective pain management. NSAIDs or selective COX-2 inhibitors can reduce acute pain, but persistent neuropathic pain is difficult to manage with these drugs. Opioids have their adverse effects and safety concerns, although they can be used to address acute or chronic pain. Hence, a multifaceted approach is to be implemented, including pharmacological and nonpharmacological therapy and surgical treatment in a selected number of cases. This chapter briefly describes the etiology of pain, its mechanism, and pain management in osteoporotic patients.

Influence of Lateral Retinacular Release in Realigning the Patella Between Varus and Valgus Knees in Primary Total Knee Arthroplasty.

Purpose: Our study aims to find the role of lateral retinacular release (LRR) on realigning the patella in knees with maltracking during primary total knee arthroplasty. We also compared the patellar morphological factors between the varus and valgus knees on predicting the need for LRR. Methods: We have retrospectively analyzed the incidence of LRR in consecutive 152 primary TKA (124 patients) from May 2018 to December 2018. We have evaluated the preoperative radiological parameters like Wiberg's patellar morphological type, patellar angle, sulcus angle, patellar width and thickness, preoperative patellar tilt and patellar shift, lateral patellofemoral angle and congruent angle. Post-operatively, patellar shift and patellar tilt were measured. Multivariate regression analysis was used to find the association of LRR with the individual radiological parameters. Results: There was no statistical difference in the postoperative patellar shift and tilt between lateral released and non-released groups, suggesting realignment of the patella after LRR (p > 0.05). The morphological parameters like patellar shift, lateral patellofemoral angle and congruent angle were significantly increased in valgus knees compared to varus knees (p < 0.05). The preoperative patellar shift of > 3.5 mm have a specificity of 93.7% and a negative predictive value (NPV) of 92.7%, congruent angle > 16° have a specificity of 85.3% and NPV of 4.2% in varus knees in predicting LRR. Conclusion: Radiological parameters of patellar maltracking like increased patellar tilt and lateral patellar shift get corrected postoperatively after performing the lateral release. Patella with Wiberg type 3 morphology, patellar shift > 3.5 mm and congruent angle > 16° in axial view tend to have an increased chance of lateral retinacular release.

Outcomes of Total Hip Replacement for Failed Hemiarthroplasty.

Aim: Our study aims to analyze the outcomes of conversion total hip replacement (THR) done for failed hemiarthroplasty. Patients and Methods: We retrospectively analyzed 104 consecutive patients who underwent conversion THR for failed hemiarthroplasty between January 2012 and December 2018. The patient's records were analyzed for demographic information, index surgery details, preoperative functional status, and perioperative complications. Patients were analyzed according to the various modes of failure of hemiarthroplasty. The radiographs were analyzed for any progressive osteolysis, cup migration and stem subsidence. All the patients were evaluated using the modified Harris hip score (HHS) for clinical outcome. Complications, revision or reoperation in the follow-up period was recorded. Results: A total of 73 patients were included in the study for final analysis after exclusion criteria. The average follow-up was 48.2 ± 29.6 months. There was a significant improvement in mean HHS from 38.5 ± 9.1 preoperatively to 80.9 ± 4.3 at the last follow-up (p < 0.05). The different modes of failure had no statistically significant difference in the postoperative Harris hip score (p = 0.393). None of the patients had progressive radiolucent lines more than 2 mm or significant subsidence in the final follow-up compared to the initial postoperative radiograph. There was one deep infection, one patient had grade 2 heterotopic ossification, intraoperative calcar fracture was fixed with cerclage wiring in 11 patients, and postoperative periprosthetic fracture in two patients was treated with plate osteosynthesis. There were no neurovascular complications or dislocation during the follow-up. Conclusion: Conversion THR for failed hemiarthroplasty is a challenging procedure and results in good functional outcome and provides reliable pain relief. Conversion THA for septic loosening by two stage revision have comparable postoperative outcomes like THA for aseptic loosening. Caution is required owing to high incidence of peri-prosthetic fracture during conversion THA. Dislocation rate is negligible even with smaller head provided the prosthesis is implanted in the proper orientation and adequate soft tissue balancing is achieved.

A Comparison of Outcomes of Culture positive and Culture negative Acute Knee Prosthetic Joint Infection following Debridement, Antibiotics and Implant Retention (DAIR).

PURPOSE: We aim to compare the outcome of culture-positive (CP PJI) and culture-negative (CN PJI) acute knee prosthetic joint infection (PJI) following debridement, antibiotics and implant retention (DAIR) with polyethylene insert exchange. We also aim to analyze the factors associated with the successful outcome of DAIR and the influence of failed DAIR on the outcome of subsequent two-stage revision arthroplasty. METHODS: We performed a retrospective review of 36 consecutive patients who underwent DAIR for acute PJI between January 2013 and January 2018. The patient's demographic data, McPherson grade, surgical details, laboratory and microbiology data were retrieved from the medical records. All the patients have been followed up for a minimum of 3 years or until re-operation, revision or death and any complications, incidence of DAIR failure, revision and mortality were noted. RESULTS: The mean follow-up was 4.9 ± 2.4 years. Among the 36 patients, 16 had CP PJI and 20 had CN PJI. Among the 16 patients with CP PJI, 8 patients had success with DAIR and 8 patients had a recurrence of infection (50%) at a mean of 21 months (range, 2 weeks to 55 months). Among the 20 patients with CN PJI, 14 patients had success with DAIR and 6 patients had a recurrence of infection [30% (6/20)] at a mean of 69 months (range, 13-221 months) (p < .05). The Kaplan-Meir survival analysis showed survivorship did not vary significantly between both groups (p > .05). Univariate regression analysis showed symptom duration of more than one month found to be significantly associated with the DAIR failure. There was no difference in failure rate after DAIR between age, Charlson comorbidity index, early postoperative versus acute hematogenous group and type of organism grown. Ten out of 14 DAIR failures were successfully managed with two-stage revision surgery with no recurrence of infection till the final follow-up. In the remaining 4 patients, one underwent re-debridement, two underwent arthrodesis and one was left with an antibiotic cement spacer. CONCLUSION: DAIR with polyethylene exchange will give comparable results irrespective of the culture positivity. Symptom duration of more than 30 days for DAIR is significantly associated with DAIR failure. DAIR failures can be successfully managed with two-stage revision.

Aggressive Presentation and Rapid Progression of Osteonecrosis of the Femoral Head After COVID-19.

Background: We aim to report the consecutive patients diagnosed with osteonecrosis of femoral head (ONFH) following recovery from COVID-19 disease and elucidate the unique features of ONFH associated with COVID-19. Methods: Consecutive 22 patients (39 hips) recovered from COVID-19 and presented with ONFH from November 2020 to October 2021 were included. All the patients received corticosteroids as a supportive treatment during COVID-19. Patients were classified into two types based on the type of presentation, namely classic ONFH and rapidly destructive coxarthrosis (RDC) depending on radiographs, MRI, inflammatory markers and hip aspiration findings. Harris hip score was used to evaluate the functional outcome before and after treatment. Results: The mean time to diagnose of ONFH from the onset of hip symptoms was 39.3 days (range 10-90 days). The average duration of onset of hip symptoms after COVID 19 infection was 7.5 months (range 3 - 11 months). The average cumulative dose of methylprednisolone equivalent was 811 mg (range 200-2100 mg) and the average duration of steroid intake was 2.8 weeks. There was significant elevation in the inflammatory markers in RDC group compared to classic ONFH (p < 0.05). The Harris hip score improved from 63.6 ± 23.2 at presentation to 82.6 ± 9.6 after treatment (p < 0.05). Three patients had features of RDC. Among the three patients with RDC, two patients had rapid progression of ONFH and underwent total hip arthroplasty (THA). The third patient is awaiting a THA. Conclusion: ONFH after COVID-19 can have a varied presentation. While the most common presentation is like classical ONFH, some patients can have an acute and aggressive presentation with rapid destruction. They have features like elevated serological markers and extensive periarticular bone and soft tissue edema. A low cumulative dose of steroids in our patients suggests that the COVID-19-associated vasculitis may play a role in the pathogenesis of ONFH.

Comparison of Efficacy of Adductor Canal Block, Local Infiltration Analgesia and Both Combined in Postoperative Pain Management After Total Knee Arthroplasty: A Randomized Controlled Trial.

PURPOSE: The aim of our study is to compare the efficacy of adductor canal block (ACB), periarticular local infiltration (PLI) and both combined (ACB + PLI) in multimodal pain management after TKA. METHODS: This is a prospective, randomized controlled double-blinded study undergoing primary unilateral TKA. They were randomized into three groups with fifty patients in each group: ACB alone (30 ml of 0.2% ropivacaine), PLI alone (30 ml 0.5% ropivacaine in 20 ml of normal saline), and both combined (ACB + PLI). The primary outcome studied was pain using visual analog score (VAS) in postoperative days (POD) 1 and 2. The secondary outcomes estimated were the ambulation capacity, the knee range of motion, need for rescue analgesia and length of hospital stay. RESULTS: The mean VAS score was significantly lower at rest and after mobilization in the combined group (3.51 at POD 1, 2.04 at POD 2), compared with either alone group (ACB = 4.70, 2.86 versus PLI = 4.39, 3.41 at POD 1 and 2 respectively after mobilization, p < 0.001). The ambulation capacity (combined = 103.3 steps versus ACB = 98.1 and PLI = 95.2 steps, p = 0.04) and the knee range of motion (arc of motion 106.7 degrees versus ACB = 104.9 and PLI = 102.2 degrees, p = 0.004) were significantly higher in the combined group compared to the other groups. There was no significant difference in the length of stay between the groups (p = 0.12). CONCLUSION: Adductor canal block combined with periarticular local infiltration provides better pain relief, good range of motion, quicker rehabilitation, and reduced opioid consumption.

Clinical and Radiological Outcome of Acetabular Reconstruction Rings in Complex Primary and Revision Total Hip Arthroplasty.

BACKGROUND: Acetabular reconstruction in complex primary and revision total hip arthroplasty (THA) with bone loss poses a great challenge. We aim to evaluate the medium-term clinical and radiological outcome of reconstruction rings used in these difficult situations. METHODS: We retrospectively reviewed a consecutive series of acetabular reconstructions with Muller ring or Bursh-Schneider cage from January 2009 to December 2016. The reconstruction rings were used in 66 hips (65 patients). There were 41 complex primary THA and 25 revision THA. The mean follow-up period was 76 months (range, 37-167 months). Clinical evaluation includes the assessment of Harris hip score, visual analogue scale (VAS) score, limb length discrepancy, and activities of daily living. The radiographs were analyzed for any signs of loosening, osteolysis, acetabular migration, and heterotopic ossification. RESULTS: The overall survival rate was 95% for revision in aseptic loosening and 87% for any reason at an average follow-up of 6.3 years. Twelve patients died and 9 patients were lost to follow-up leaving 45 patients for final functional analysis. Among the 45 patients, excellent to good results were seen in 33 patients, fair results were seen in 5 patients, poor results were seen in seven patients. Two patients had aseptic loosening and another two patients developed deep chronic infection awaiting two-stage revision. CONCLUSION: Reconstruction rings still place a role in the armamentarium for complex acetabular reconstruction. It helps to reliably restore the bone stock, have an acceptable survival rate and satisfactory functional outcome at medium to long-term follow-up.

Influence of Intraoperative Medial Collateral Ligament Bony Avulsion Injury on the Outcome of Primary Total Knee Arthroplasty.

BACKGROUND: The purpose of this study is (1) to find the clinical and radiological outcome of intraoperative bony avulsion of medial collateral ligament (MCL) treated with screw and washer construct and (2) to predict the preoperative factors which may contribute to the avulsion-type MCL injury during primary total knee arthroplasty (TKA). METHODS: Intraoperative MCL avulsion injury occurred in 46 (0.8%) of the 4916 consecutive primary TKA from January 2011 to December 2015. After exclusion, the 41 knees were matched 1:2 with controls without MCL injury and compared for the various clinical, radiological, and functional parameters. The clinical parameters analyzed were age, gender, body mass index, preoperative diagnosis like osteoarthritis or rheumatoid arthritis, range of motion, sagittal deformity, and vitamin D levels. The radiological parameters calculated were coronal deformity, proximal tibial varus angle, distal femur valgus angle, joint line congruence angle, posterior tibial slope, "cup and saucer" morphology, presence or absence of knee subluxation, tibia vara, and femoral bowing. The preoperative and postoperative Knee Society Score and Knee Society Functional Score were analyzed. Complications or revisions, if any, were noted during the follow-up. Multivariate logistic regression analysis was used to predict the preoperative risk factors for MCL avulsion injury. RESULTS: At a mean follow-up of 58.4 ± 19.3 months, there were no radiological or physical examination findings of instability. Compared to the preoperative disability, there was a statistically significant improvement in clinical scores (Knee Society Score and Knee Society Functional Score) in the final follow-up (P < .001) in both cases and the control group. The mean preoperative coronal deformity was 170.6 ± 6.96 in the study group and 167.7 ± 4.3 in the control group (P = .021). The mean preoperative tibial slope was 10.5 ± 4.9 in the study group and 7.91 ± 4.15 in the control group (P = .003). The preoperative knee subluxation was present in 48.8% knees (P < .001) and "cup and saucer" morphology in 68.3 knees (P < .001) in the study group. The adjusted odds of MCL avulsion injury were greater for severe varus deformity (odds ratio [OR] 1.462, 95% confidence interval [CI] 1.15-1.86), knee subluxation (OR 39.78, 95% CI 3.78-418.86), and "cup and saucer" morphology (OR 33.11, 95% CI 5.69-192.66). CONCLUSION: Intraoperative MCL bony avulsion injury can be managed successfully with screw and washer construct without the need for increased prosthetic constraint in primary TKA. The presence of severe varus deformity, knee subluxation, and "cup and saucer" morphology tend to have an increased chance of MCL avulsion injury.

Failed Internal Fixation in Bilateral Femoral Neck Stress Fracture Salvaged with Total Hip Arthroplasty: A Report of Two Cases with Literature Review.

Bilateral Femoral neck stress fractures (FNSFs) are rare without any underlying metabolic disease or repeated strenuous activities like athletes or military recruits. It constitutes about 5-8% of all stress fractures. Treatment options are still controversial. We report two young women with bilateral simultaneous FNSFs without any metabolic cause, presented to us following failed internal fixation with cancellous screws and neck resorption salvaged with total hip arthroplasty. Compression type stress fracture healed in the final follow-up on the other side.

Clinical and radiological outcomes of total joint arthroplasty in patients with ochronotic arthropathy.

PURPOSE: Alkaptonuria is a rare metabolic disorder, and only a few case reports of total joint arthroplasty (TJA) for ochronotic arthropathy are described in the literature. We aim to analyse the functional and radiological outcomes of TJA in patients with ochronotic arthropathy. METHODS: We retrospectively collected the data of twenty-seven TJA in sixteen patients with ochronotic arthropathy from April 2007 to December 2017. We assessed the functional outcome through pre- and post-operative modified Harris hip score (HHS) and knee society score (KSS). The hip radiographs were analysed for migration and radiolucent zones, and the knee radiographs were assessed using knee society roentgenographic evaluation and scoring system. RESULTS: The mean follow-up was 39.4 months (12-132 months). Two patients died before the final follow-up. There was a statistically significant improvement in mean HHS from 17.8 preoperatively to 78 at the final follow-up (p < 0.001). Similarly, there was a significant improvement in mean KSS, following the surgery, from 27.2 preoperatively to 89.4 (p < 0.001). One patient developed deep infection, and another patient presented with aseptic loosening of the acetabular component after 7 years. In the radiological evaluation at the final follow-up, signs of lysis or loosening were not noted in any of the other patients. CONCLUSION: End-stage arthritis in ochronotic arthropathy is not uncommon. These patients can have multiple joint involvements, and the need for multiple surgeries should be considered. TJA in ochronotic arthropathy leads to a significant improvement in the functional outcome compared with the preoperative disability.

Para-articular Osteochondroma of Patella with Coexisting Osteoarthritis.

INTRODUCTION: Para-articular osteochondromas are rare osteocartilaginous tumors arising adjacent to the joint, more common around the knee. In contrast to osteochondroma, they occur in elderly patients. CASE REPORT: We report a 60-year-old female with slow-growing, extraosseous soft tissue mass in the infrapatellar fat pad region with coexisting osteoarthritis. Total excision of the mass with total knee arthroplasty (TKA) done. The patient had excellent functional outcome with no recurrence at 2-year follow-up. CONCLUSION: The incidence of para-articular osteochondromas in elderly patients with coexisting osteoarthritis is very rare. Clinicoradiological features along with histopathology confirm its diagnosis. Total excision is the mainstay of treatment along with TKA if there is coexisting arthritis and its recurrence is very rare.

Preoperative Radiological Parameters Predicting the Need for Lateral Retinacular Release in Total Knee Arthroplasty.

BACKGROUND: Proper patellar tracking is essential for well-functioning total knee arthroplasty (TKA). Besides implanting components in the correct position and rotation, balancing parapatellar soft tissues is also important in aiding normal patellar tracking. Patellar maltracking during TKA can be improved by lateral retinacular release (LRR). METHODS: We studied the incidence of LRR in consecutive primary TKA with nonresurfaced patella and posterior-stabilized implant design. We analyzed data from 250 consecutive primary TKAs (212 patients) from January 2016 to May 2016. We evaluated the preoperative radiological parameters like patellar tilt, patellar shift, patellar morphology, Insall-Salvati ratio, femoro-tibial angle, distal femoral valgus angle, and proximal tibia varus angle which predict the need for LRR during TKA. We used multivariate regression analysis to find the association of individual radiological parameters and the LRR. RESULTS: The need for LRR is significantly associated with preoperative radiological parameters like patellar shift and patellar tilt (P < .001). Compared to the nonreleased group, the adjusted odds of LRR were greater for morphological parameters like Wiberg type 3 patella (odds ratio [OR] 17.45, 95% confidence interval [CI] 7.21-42.20), lateral facet thinning (OR 4.38, 95% CI 2.37-8.07), lateral patellofemoral arthritis (OR 14.36, 95% CI 6.82-30.23), and coronal valgus deformity (OR 4.95, 95% CI 1.60-10.68). CONCLUSION: Preoperative assessment of these radiological parameters in the axial view implies a high chance of tight lateral retinacular structures. This helps in identifying patients who have a higher likelihood for patellar maltracking during TKA. Appropriate LRR helps to provide better patellar tracking post TKA.