Akagi M, Ueo T, Matsusue Y, Akiyama H, Nakamura T
Department of Orthopaedic Surgery, Faculty of Medicine, Kyoto University, Japan.
Bull Hosp Jt Dis. 1997;56(4):225-32.
One objective of the modification of the total condylar knee is to increase the range of flexion without compromising the durability of the prosthesis. The KU knee prosthesis was designed to improve postoperative range of motion. This prosthesis has a unique ball-and-socket joint in the center of the posterior portion of the femorotibial articulation. A retrospective comparative study was undertaken to determine whether the KU knee prosthesis had achieved its design objectives. The study was based on the clinical observation of two populations: one (the TC group: 31 joints) with total condylar prostheses and the other (the KU group; 31 joints) with KU knee prostheses. At two years postoperatively, the mean postoperative range of flexion was 94 degrees (range: 60 degrees to 120 degrees) in the TC group and 120 degrees (range: 95 degrees to 150 degrees) in the KU group. The mean postoperative range of flexion was 24 degrees better in the KU group than in the TC group (p < 0.01). The mean functional score was 76 points (range: 61 to 86) in the TC group and 81 points (range: 56 to 92) in the KU group. There were no statistically significant difference in pain, walking ability, deformity, extension lag, and activities of daily living (ADL) score between the two groups. However, a statistically significant difference was detected in the range of motion (ROM) score (p < 0.01). No major complications occurred in either of the two groups. Although the follow-up period was not long enough, the KU knee was thought to be a promising modification of the total condylar knee prosthesis.
全髁膝关节假体改良的一个目标是在不影响假体耐用性的前提下增加屈曲范围。KU膝关节假体旨在改善术后活动范围。该假体在股骨胫骨关节后部中心有一个独特的球窝关节。进行了一项回顾性对照研究，以确定KU膝关节假体是否实现了其设计目标。该研究基于对两组人群的临床观察：一组（全髁假体组：31个关节）使用全髁假体，另一组（KU组；31个关节）使用KU膝关节假体。术后两年，全髁假体组术后平均屈曲范围为94度（范围：60度至120度），KU组为120度（范围：95度至150度）。KU组术后平均屈曲范围比全髁假体组大24度（p<0.01）。全髁假体组平均功能评分为76分（范围：61至86分），KU组为81分（范围：56至92分）。两组在疼痛、行走能力、畸形、伸直滞后和日常生活活动（ADL）评分方面无统计学显著差异。然而，在活动范围（ROM）评分方面检测到统计学显著差异（p<0.01）。两组均未发生重大并发症。尽管随访期不够长，但KU膝关节被认为是全髁膝关节假体的一种有前景的改良。
