PURPOSE Unicompartmental knee arthroplasty (UKA) combined with anterior cruciate ligament (ACL) reconstruction has recently been suggested as a feasible treatment option for young and active patients with medial compartment osteoarthritis (OA) and ACL deficiency. The aim of this study is to evaluate retrospectively the outcomes of two different implant designs in patients with medial OA secondary to traumatic ACL rupture, who underwent combined ACL reconstruction and unicompartmental knee replacement. METHODS From January 2007, to December 2013, 24 patients with medial OA secondary to ACL rupture underwent medial unicompartmental knee arthroplasty (UKA) and ACL reconstruction. Nine patients received a mobile bearing UKA (Group 1) and fifteen a fixed-bearing one (Group 2). The mean follow-up was 53 ± 8.3 months for Group 1 and 42 ± 6.7 months for Group 2. Knee Society Score (KSS), Western Ontario and McMaster Index of Osteoarthritis (WOMAC) index and radiological evaluation used to assess the implant loosening alignment of the knee joint and tibial slope were recorded pre-operatively and at the last follow-up. RESULTS At the final follow-up, all patients showed statistically significant clinical improvements with respect to the pre-operative values (p < 0.05). No significant difference was observed in WOMAC index and KSS both objective and functional between groups at the last follow-up (KSS obj. 73.4 ± 9.3 vs 77.3 ± 10.5; KSS funct. 86.2 ± 6.2 vs 84.7 ± 5.9; WOMAC 79.3 ± 7.3 vs 81.3 ± 7.6 for Group 1 and 2, respectively). No differences in radiolucent lines were found between the groups. CONCLUSION The use of different prosthesis design (fixed- or mobile-bearing) during a combined procedure of ACL reconstruction and medial unicompartmental arthroplasty does not affect the middle-term clinical and radiological outcomes.

中文翻译：

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前交叉韧带重建与内侧单室膝关节置换相关：一项回顾性研究，比较了两种不同植入物设计的临床和放射学结果。

目的最近提出了单室膝关节置换术（UKA）结合前交叉韧带（ACL）重建术作为治疗内侧活动性骨关节炎（OA）和ACL缺乏的年轻活跃患者的可行治疗选择。这项研究的目的是回顾性评估两种不同的植入物设计在外伤性ACL破裂继发的内侧OA患者中的效果，这些患者接受了ACL重建和单室膝关节置换的联合治疗。方法2007年1月至2013年12月，对24例ACL继发的内侧OA患者进行了内侧单室膝关节置换术（UKA）和ACL重建。9例患者接受了活动轴承UKA（第1组），十五例接受了固定轴承的UKA（第2组）。第一组的平均随访时间为53±8.3个月，平均随访时间为42±6。第2组为7个月。术前和最后记录膝关节社会评分（KSS），西安大略省和麦克马斯特骨关节炎指数（WOMAC）以及用于评估膝关节和胫骨倾斜度的植入物松动程度的放射学评估。跟进。结果在最后的随访中，所有患者在术前值方面均显示出统计学上显着的临床改善（p <0.05）。在最后一次随访中，各组之间的客观和功能方面的WOMAC指数和KSS均无显着差异（KSS目标73.4±9.3 vs 77.3±10.5; KSS功能86.2±6.2 vs 84.7±5.9; WOMAC 79.3±7.3 vs第1组和第2组分别为81.3±7.6）。两组之间的射线可透线没有差异。