Lee Sang Min, Seo Yong Gon, Park Won Hah, Yoo Jae Chul
Division of Sports Medicine Center, Department of Orthopedic Surgery, Samsung Medical Center, Sungkyunkwan University College of Medicine, Seoul, Republic of Korea.
Department of Orthopedic Surgery, Samsung Medical Center, Sungkyunkwan University College of Medicine, Seoul, Republic of Korea.
Orthop J Sports Med. 2020 Feb 7;8(2):2325967119899346. doi: 10.1177/2325967119899346. eCollection 2020 Feb.
Shoulder function after rotator cuff repair is associated with patient satisfaction after surgery. Several studies have demonstrated that the muscle strength ratio (external rotators/internal rotators) is an important factor to evaluate shoulder function, but little is known about the relationship between the preoperative muscle strength ratio and postoperative shoulder function.
To evaluate the effect of the preoperative muscle strength ratio of the shoulder rotators on function after rotator cuff repair.
Cohort study; Level of evidence, 3.
The study participants were patients with small- to medium-sized rotator cuff tears diagnosed by magnetic resonance imaging; 77 patients were included in the analysis. Preoperative muscle strength was assessed through use of isokinetic equipment. Patients were classified into 2 groups (normal and abnormal) according to a normal strength ratio range of 55% to 75%, with "abnormal" meaning a deviation of more than 15% from the normal range. The American Shoulder and Elbow Surgeons (ASES) score and the Constant score were used to evaluate shoulder function preoperatively and postoperatively at 6 months, 1 year, and 2 years.
There were 30 patients in the normal group and 47 in the abnormal group, with a preoperative muscle strength ratio of 63.5% ± 5.5% and 42.6% ± 6.1%, respectively. The ASES score was 88.6 ± 9.1 in the normal group and 77.5 ± 13.6 in the abnormal group at 2 years postoperatively, and the Constant score was 82.7 ± 8.4 in the normal group and 69.5 ± 13.4 in the abnormal group at 2 years postoperatively. A significant difference was found in postoperative shoulder function between the normal and abnormal groups.
This study demonstrated that the preoperative muscle strength ratio was associated with postoperative shoulder function. The preoperative muscle strength ratio should be considered an important predictor of shoulder function after rotator cuff repair.
肩袖修复术后的肩部功能与术后患者满意度相关。多项研究表明，肌肉力量比（外旋肌/内旋肌）是评估肩部功能的重要因素，但术前肌肉力量比与术后肩部功能之间的关系却鲜为人知。
评估肩部旋转肌术前肌肉力量比对肩袖修复术后功能的影响。
队列研究；证据等级，3级。
研究参与者为经磁共振成像诊断为中小型肩袖撕裂的患者；77例患者纳入分析。术前肌肉力量通过等速设备进行评估。根据正常力量比范围55%至75%，将患者分为两组（正常组和异常组），“异常”指偏离正常范围超过15%。采用美国肩肘外科医师（ASES）评分和Constant评分在术前以及术后6个月、1年和2年评估肩部功能。
正常组30例患者，异常组47例患者，术前肌肉力量比分别为63.5%±5.5%和42.6%±6.1%。术后2年，正常组ASES评分为88.6±9.1，异常组为77.5±13.6；术后2年，正常组Constant评分为82.7±8.4，异常组为69.5±13.4。正常组和异常组术后肩部功能存在显著差异。
本研究表明，术前肌肉力量比与术后肩部功能相关。术前肌肉力量比应被视为肩袖修复术后肩部功能的重要预测指标。
