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Osteochondritis dissecans (OCD) is an increasingly common cause of knee pain and dysfunction among skeletally immature and young adult patients. Operative treatment is indicated for any detached or unstable lesions in which physeal closure is imminent or completed, and nonoperative management has failed. In the case of adult OCD, which will generally have a poor prognosis, 1) surgical intervention is necessary. The treatment of symptomatic lesions in OCD of the knee is difficult, particularly in young patients who wish to maintain a high degree of sports activity.2-5) Management of OCD in a young patient is mul-

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Purpose:To analyze the clinical and radiographic results after revision total knee arthroplasty (TKA) using Nexgen Ⓡ LCCK (Legacy Ⓡ knee constrained condylar knee, Zimmer, Warsaw, IN) with allograft. Materials and Methods:Twenty patients (21 knees) taken revision TKA were analyzed. The average age of the patients was 69.2 years old and the average of follow-up duration was for 2 year to 8 years 2 months (average 3 years 5 months). The clinical result and radiographic measurements were assessed using the Hospital for Special Surgery (HSS) knee rating score and the roentgenographic method of the American Knee Society. Results:The mean interval from TKA to revision surgery was 6 years 4 months. In all cases, allograft was used. The average range of motion was increased from 93 o to 107 o , HSS score was increased from an average of 45 to 87 points. Postoperative femorotibial alignment was averaged 5.7 o valgus. In all cases, radiolucency was below 4 scores and there was no loosening of implant. But, three radiopaque lines around a stem. There were wound dehiscence in 1 case and superficial infection in 2 cases. Conclusion: Satisfactory results were obtained in revision TKA using a NexGen Ⓡ LCCK with allograft.But, this study is favorable for the long term follow-up.