[Two kinds of lateral retinacular release for lateral patellar compression syndrome:a retrospective comparative study].

Objective: To compare the clinical effects of arthroscopic lateral retinacular proximal release and "L" type release for lateral patellar compression syndrome. Methods: Sixty four lateral patellar compression syndrome (LPCS) patients were recruited who had arthroscopic surgery during September 2004 to January 2019 at Department of Sports Medicine,Peking University Third Hospital by the same group of doctors and a retrospective comparative study was conducted accordingly. Among them,24 cases underwent the traditional proximal release of lateral patellar retinaculum (traditional group),including 7 males and 17 females with an age of (42.9±14.6)years(range:23 to 72 years); 40 cases were treated with novel lateral retinacular release of "L" type release revised based on the previous experiences (novel group), consisting of 12 males and 28 females with an age of (54.9±13.1) years (range:28 to 76 years).All the patients participated surveys for the visual analogue scale (VAS),Lysholm score and International Knee Documentation Committee (IKDC) knee function subjective evaluation before and after the operation. The comparison of scores within groups was performed by Wilcoxon test,and comparison between groups was performed by Mann-Whitney U test and Chi-square test. Multivariate analysis was used to evaluate the related factors affecting each score. Results: The follow-up durations of traditional group and novel group were (12.6±1.0) years (range:11.7 to 15.3 years) and (2.2±1.0)years(range:1.0 to 4.4 years) respectively. At the last follow-up,VAS(0(1.0)to 6.0(2.0),Z=-5.471,P<0.01),Lysholm score(98.0(10.0)to 48.0(40.0),Z=-5.511,P<0.01),and IKDC score(82.8(11.2)to 37.4(18.5),Z=-5.444,P<0.01) in novel group were statistically significantly improved,and the postoperative excellent rate of Lysholm score was 97.5% in general. There was no significant difference in the changes of the three scores (P>0.05) between the traditional group and the novel group. However,20.8% (5/24)patients in the traditional group reported significant weakness of the knee extension after surgery,while no such complain was received in the novel group (P<0.01).The results of univariate analysis showed that surgical method was a related factor affecting the changes of VAS before and after surgery (P<0.05).The results of multivariate analysis showed that whether or not with osteoarthritis and operation type were independent factors affecting the changes of Lysholm and IKDC scores (P<0.05). Conclusions: The long-term effect of arthroscopic lateral retinacular release for the treatment of LPCS is satisfactory. Compared with the traditional proximal release surgery,the "L" type release can effectively avoid the complication of significant weakness of the knee extension significantly.目的： 比较关节镜下向近端松解和“L”型松解外侧支持带治疗髌骨外侧过度挤压综合征（LPCS）的临床效果。 方法： 回顾性分析2004年9月至2019年1月由北京大学第三医院运动医学科同一组医师手术治疗的64例LPCS患者的病例资料。早期24例患者采用向近端松解外侧支持带法治疗（传统组），其中男性7例，女性17例，年龄（42.9±14.6）岁（范围：23~72 岁）；近期40例患者在吸取早期手术经验的基础上改用侧向松解外侧支持带法，即“L”形松解治疗（新术式组），其中男性12例，女性28例，年龄（54.9±13.1）岁（范围：28~76岁）。收集患者手术前、后疼痛视觉模拟评分（VAS）、Lysholm评分和国际膝关节文献委员会膝关节评估量表（IKDC）评分。组内评分的比较采用Wilcoxon秩和检验，组间比较采用Mann-WhitneyU检验和χ²检验，分别采用Mann-WhitneyU检验、一般线性模型进行单因素、多因素分析，评估影响各评分的相关因素。 结果： 传统组随访时间（12.6±1.0）年（范围：11.7~15.3年），新术式组随访时间（2.2±1.0）年（范围：1.0~4.4年）。末次随访时新术式组患者的VAS［0（1.0）分比6.0（2.0）分，Z=-5.471，P<0.01］、Lysholm评分［98.0（10.0）分比48.0（40.0）分，Z=-5.511，P<0.01］和IKDC评分［82.8（11.2）分比37.4（18.5）分，Z=-5.444，P<0.01］均较术前改善；Lysholm评分的优良率为97.5%（39/40）。新术式组与传统组相比，三项评分的变化值均无差异（P>0.05），但20.8%（5/24）的传统组患者术后出现伸膝装置显著力弱，而新术式组未出现该现象（P<0.01）。单因素分析结果显示，手术方式是影响患者手术前后VAS变化的相关因素（P<0.05）。多因素分析结果显示，合并骨关节炎和手术方式是影响患者Lysholm和IKDC评分变化值的独立相关因素（P值均<0.05）。 结论： 关节镜下外侧支持带松解治疗LPCS的长期效果满意，与向近端松解的传统术式相比，“L”形松解效果更有优势，可有效避免术后伸膝装置显著力弱的发生。.