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Postoperative radiation for prevention of heterotopic ossification (HO) has been proven effective for the patients with ankylosing spondylitis (AS) after total hip arthroplasties (THA). This study aims to evaluate the effect of postoperative radiation in HO formation following THA in patients with AS. We retrospectively reviewed 129 hips from 91 patients with AS receiving primary THA from July 2004 to December 2012. There were total 38 patients (53 hips) did not receive postoperative prophylaxis in Group I. Moreover, 53 patients (76 hips) received postoperative single-fraction radiotherapy of 500 cGy in Group II. After a minimum 12-month follow-up, there was no significant difference in HO formation between the two groups (P=0.210). This study suggests that postoperative radiation may not be necessary in Asian patients., (Copyright © 2015 Elsevier Inc. All rights reserved.)

Bone prosthesis composite (BPC) had been widely-used in reconstruction after wide excision of malignant tumors around the knee. However, implant selection for BPC remains a dilemma. Forty-one patients with high-grade malignant bone tumors around the knee who underwent excision and reconstruction with BPC and rotating hinged knee (RHK) prosthesis were included. The mean follow-up time was 54 months (range, 31-78 months). The average Musculoskeletal Tumor Society Rating score was 93.4% (range, 73-100%). The mean range of motion was 125°. Complications included 2 local recurrences, 2 nonunions, and 1 peri-prosthetic fracture. The reconstruction with BPC using the RHK prosthesis provided consistently good functional results with a low complication rate. The RHK prosthesis is a promising choice for BPC reconstruction., (Copyright © 2014 Elsevier Inc. All rights reserved.)

Some studies have reported the presence of audible squeaking in ceramic-on-ceramic total hip arthroplasty (THA), and several factors such as implant malposition or poor soft tissue recovery have been described as the cause. Our purpose was to determine the squeaking rate in the Asian population with a consecutive series of ceramic-on-ceramic THA. From 2003 to 2009, 413 THAs were performed by a single surgeon using a minimally invasive modified anterior-lateral approach. Using both questionnaire and physical examination, no squeaking was identified in any cases with a minimum of 2-year follow-up. Complications occurred in 4 patients. The results of this study suggested squeaking phenomenon after ceramic-on-ceramic THA may be eliminated., (Copyright © 2012 Elsevier Inc. All rights reserved.)

The purpose of this retrospective study was to compare clinical parameters in preoperative, perioperative, and postoperative categories between valgus and varus deformities in primary total knee arthroplasty (TKA) following midvastus approach. We compared 83 patients (83 TKAs in valgus) with 949 patients (1084 TKAs in varus), with a mean follow-up of 72 months. In valgus deformity, mean age and body mass index at TKA were younger and smaller with more percentage of patellar subluxation. Cutting thickness from distal femur, tibial plateau, and lateral aspect of posterior femur were significantly different. The incidence of lateral release was 10.8% in valgus and 2.1% in varus. Although several significant differences were observed in preoperative and perioperative categories, the postoperative functional results were similarly evaluated by Knee Society knee and function scores., (Copyright © 2012 Elsevier Inc. All rights reserved.)

The purpose of this study was to evaluate retrospectively the outcomes of cementation of cross-linked polyethylene (PE) liner in a well-fixed metal shell in 23 hips with an average follow-up period of 6 years. The mean Harris hip score was 69.6 +/- 12 (range, 46-83) points preoperatively. The average postoperative follow-up was 72.3 months (range, 56-100 months). At the final follow-up, the mean Harris hip score was 95.5 +/- 3 (84-100) points. There was no change in the bone-shell interface. No new osteolytic lesions were identified. The lesions impacted with bone graft had united completely. The remaining osteolytic lesions had decreased in size. There was no recurrent osteolysis, hip dislocation, component migration, and failure at the cement-metal interface. The results of the current study revealed that cementation of cross-linked PE liner into a well-fixed shell provided good midterm durability., ((c) 2010 Elsevier Inc. All rights reserved.)

Loss of the knee extensor mechanism results in a change of normal knee joint alignment and functional anteroposterior instability. In patients with neglected or chronic patellar tendon rupture, advanced degenerative change of the knee joints may develop at the later stage. We present a case of a 64-year-old man with chronic left patellar tendon rupture and 10-cm proximal patella migration associated with advanced osteoarthritis of the knee. Total patellectomy and simultaneous total knee arthroplasty (TKA) relieved his symptoms and disability successfully. His left knee still did well at 7-year follow-up.