Objective: To investigate the clinical outcomes of total knee arthroplasty (TKA) combined with the modified "overlap" technique in the treatment of end-stage knee osteoarthritis with fixed patellar dislocation. Methods: This is a retrospective case series study. Clinical data of 19 patients (22 knees) who underwent TKA combined with the modified "overlap" technique for the treatment of end-stage knee osteoarthritis with permanent patellar dislocation from January 2011 to January 2022 in the Department of Orthopaedics, the First Affiliated Hospital of Xinjiang Medical University were retrospectively analyzed. The cohort included 5 males (6 knees) and 14 females (16 knees), with an age of (60.6±12.2) years (range:33 to 77 years) and a body mass index of (25.4±4.1) kg/m² (range:20.0 to 33.0 kg/m²). Among them, 11 cases (12 knee) had valgus deformity, with Keblish classification showing mild in 2 cases (2 knees), moderate in 6 cases (6 knees), and severe in 4 cases (4 knees). All cases were treated using a medial parapatellar approach, with lateral retinaculum release combined with the "overlap" technique to restore the patellar trajectory. Knee function was evaluated using the American Knee Society (KSS) Score. Paired sample t tests were used for intergroup comparisons. Results: All patients successfully completed the surgery. Postoperatively, patellar dislocation, knee valgus deformity, flexion contracture deformity, and extensor lag were all corrected. All patients were followed up, with a follow-up duration of (63.8±35.2) months (range:24 to 136 months). One patient experienced periprosthetic infection 2 weeks postoperatively, 1 patient had recurrent patellar dislocation 2 months postoperatively, 1 patient developed knee stiffness 3 months postoperatively and underwent closed manipulation. No other patients exhibited signs of patellar dislocation or subluxation. At the last follow-up, the KSS clinical score improved from (36.4±12.7) points preoperatively to (83.4±6.3) points postoperatively (t=-15.15, P<0.01), and the KSS functional score improved from (30.7±11.1) points preoperatively to (77.6±8.3) points postoperatively (t=-14.37, P<0.01). The range of motion of the knee increased from 81.7°±19.6° preoperatively to 107.6°±12.5° postoperatively (t=-4.85, P<0.01). Conclusion: TKA combined with the modified "overlap" technique is an effective surgical option for the treatment of end-stage knee osteoarthritis with permanent patellar dislocation, demonstrating satisfactory clinical outcomes.
目的： 探讨全膝关节置换术（TKA）联合改良“overlap”技术治疗终末期膝关节骨关节炎合并固定性髌骨脱位的临床效果。 方法： 本研究为回顾性病例系列研究。回顾性分析2011年1月至2022年1月于新疆医科大学第一附属医院关节外科接受TKA联合改良“overlap”技术治疗终末期膝关节骨关节炎合并固定性髌骨脱位的19例（22膝）患者的临床资料。男性5例（6膝），女性14例（16膝），年龄（60.6±12.2）岁（范围：33~77岁），体重指数（25.4±4.1）kg/m2（范围：20.0~33.0 kg/m2）。其中11例（12膝）合并外翻畸形，Keblish分型轻度2膝，中度6膝，重度4膝。所有病例通过髌旁内侧入路，采用松解外侧支持带联合“overlap”技术恢复髌骨轨迹。采用美国膝关节协会（KSS）评分评估膝关节功能。组间比较采用配对样本t检验。 结果： 所有患者均顺利完成手术，术后髌骨脱位、膝关节外翻畸形、屈曲挛缩畸形及伸膝迟滞均得到矫正。所有患者获得随访，随访时间（63.8±35.2）个月（范围：24~136个月）。1例患者术后2周发生假体周围感染；1例术后2个月髌骨脱位复发；1例术后3个月出现膝关节僵硬，行闭合松解术；其余患者均未出现髌骨脱位或半脱位等征象。末次随访时，KSS临床评分由术前的（36.4±12.7）分升至（83.4±6.3）分（t=-15.15，P<0.01），KSS功能评分由术前的（30.7±11.1）分升至（77.6±8.3）分（t=-14.37，P<0.01），膝关节活动度由术前的81.7°±19.6°提高至107.6°±12.5°（t=-4.85，P<0.01）。 结论： TKA联合改良“overlap”技术治疗终末期膝关节骨关节炎合并固定性髌骨脱位的临床效果满意，是可选择的手术方法。.