Objective: To investigate the long-term outcomes of minimally invasive Oxford phase Ⅲ unicompartmental knee arthroplasty (UKA) for patients with medial compartment osteoarthropathy. Methods: The clinical data of 594 patients (701 knees) who underwent minimally invasive UKA with Oxford phase Ⅲ unicompartmental prosthesis at Department of Orthopedics,the Affiliated Hospital of Qingdao University from January 2007 to January 2016 were retrospectively analyzed.There were 155 males and 439 females,aged (62.6±10.9) years (range: 44 to 81 years),with a body mass index of (26.9±3.8) kg/m2 (range: 21.1 to 36.2 kg/m2).There were 359 left knees and 342 right knees,676 knees with osteoarthritis and 25 knees with idiopathic osteonecrosis of the medial femoral condyle.There were 487 cases underwent UKA (66 cases underwent UKA on one side and total knee arthroplasty on the other) and 107 cases underwent bilateral UKA.Patients' prosthetic survival,complications,range of motion(ROM) of the knee,visual analogue score (VAS),Western Ontario and McMaster University (WOMAC) osteoarthritis index,and American knee society score (KSS) were collected to assess clinical outcomes.Paired sample t test was used to compare the data before and after operation. Results: All patients completed the surgery successfully.There was no intraoperative fractures,postoperative infections or symptomatic vascular embolic disease occurred.The postoperative complications,including mobile bearing dislocation,prosthesis loosening,tibial plateau collapse,the lateral compartment degeneration and postoperative pain were occurred in 18 cases (3.0%,18/594).Thirteen patients suffered complications were transferred to total knee arthroplasty,4 underwent partial revision,if this was used as the endpoint of the study,the surgical success rate was 97.1% (577/594) and the prosthetic revision rate was 2.9%.The ROM was improved from(105.9±11.8)°preoperatively to (114.0±13.3)° at the last follow-up (t=10.796,P<0.01);the KSS clinical score was increased from 54.3±3.6 to 90.1±6.0 (P<0.01) and the functional score was increased from 55.9±3.9 to 87.5±5.7(t=124.325,P<0.01;t=110.985,P<0.01).The WOMAC osteoarthritis index was decreased from 54.8±6.7 to 9.2±3.1 at the last follow-up(t=150.860,P<0.01) and the VAS was decreased from 6.1±1.1 to 1.5±1.0 at the last follow-up(t=74.941,P<0.01). Conclusions: Minimally invasive Oxford phase Ⅲ UKA for medial compartment knee osteoarthritis has a favorable prosthesis survival rate,low revision rate,and few complications at long-term follow-up.Patients have significant improvement in knee function with satisfactory clinical outcomes.
目的： 探讨微创第三代牛津单髁置换术（UKA）治疗膝关节内侧间室骨关节病的远期临床效果。 方法： 回顾性分析2007年1月至2016年1月青岛大学附属医院关节外科采用第三代牛津单髁假体行微创UKA治疗的 594例（701膝）患者的临床资料。男性155例，女性439例，年龄（62.6±10.9）岁（范围：44~81岁），体重指数（26.9±3.8）kg/m2（范围：21.1~36.2 kg/m2）；骨性关节炎676膝，股骨内侧髁特发性骨坏死25膝；其中行单侧UKA 487例（其中66例一侧行UKA，另一侧行全膝关节置换术），行双侧UKA 107例。收集患者术前和末次随访时的假体生存率、膝关节活动度（ROM）、疼痛视觉模拟评分（VAS）、西安大略和麦克马斯特大学（WOMAC）骨关节炎指数、美国膝关节协会评分（KSS）等，记录并发症情况，评估患者术后临床效果。手术前后数据的比较采用配对样本t检验。 结果： 所有患者均顺利完成手术，未发生术中骨折、术后感染及症状性血管栓塞性疾病等。术后平均随访121.6个月（范围：70~178个月）。发生术后垫片脱位、假体松动、胫骨平台塌陷、外侧间室退变以及术后疼痛等并发症18例，并发症发生率为3.0%（18/594）；其中行全膝关节置换术翻修13例，更换垫片部分翻修4例，假体翻修率为2.9%（17/594）；若以翻修作为假体生存率研究的终点，则该组病例远期随访手术成功率为97.1%（577/594）。患者ROM由术前的（105.9±11.8）°升至末次随访时的（114.0±13.3）°（t=10.796，P<0.01），KSS 中临床和功能评分分别由术前的（54.3±3.6）分和（55.9±3.9）分升至末次随访时的（90.1±6.0）分和（87.5±5.7）分（t=124.325，P<0.01；t=110.985，P<0.01）；WOMAC骨关节炎指数由术前的（54.8±6.7）分降至末次随访时的（9.2±3.1）分（t=150.860，P<0.01）；VAS 由术前的（6.1±1.1）分降至末次随访时的（1.5±1.0）分（t=74.941，P<0.01）。 结论： 微创UKA治疗膝内侧间室骨关节病远期随访假体生存率高，翻修率低，并发症少，患者膝关节功能改善明显，临床疗效满意。.