PURPOSE Previous studies show no difference in clinical outcomes between patients with healed and structurally failed rotator cuff repairs. The objective of this study was to assess ceiling effects when reporting surgical outcomes of arthroscopic rotator cuff repair using four of the currently most popular clinical shoulder outcome scoring systems. METHODS Ninety-two patients who underwent arthroscopic rotator cuff repair were examined. The simple shoulder test (SST), American Shoulder and Elbow Surgeons (ASES) score, University of California at Los Angeles (UCLA) shoulder rating scale, and Constant-Murley shoulder score were completed 2 years postoperatively. Demographic data of the subjects were analysed using descriptive statistics. The ceiling effects in the outcome data assessed for each scale were estimated based on two previously reported definitions. RESULTS The number of patients with the maximum possible score was 31 (33.7%) with the SST, 26 (28.3%) with the ASES score, 28 (30.4%) with the UCLA scale, and 18 (19.6%) with the Constant-Murley score. The standardised distance of the outcome data assessed by the SST, ASES score, UCLA scale, and Constant-Murley scores were 0.92, 0.97, 0.96, and 1.18, respectively. CONCLUSION The SST, ASES score, and UCLA scale evaluated at 2 years postoperatively have substantial ceiling effects showing that the proportion of patients with the maximum possible score is > 20%, and the standardised distance is < 1.0. Researchers should be aware of possible biases due to ceiling effects when interpreting the results of studies investigating the surgical outcomes of arthroscopic rotator cuff repair. It could increase the likelihood of a type II error. LEVEL OF EVIDENCE IV.

中文翻译：

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关节镜检查肩袖修复后2年，肩部结局评分系统具有明显的天花板效应。

目的先前的研究表明，肩袖修复愈合和结构失败的患者在临床结局方面无差异。这项研究的目的是评估使用四种当前最流行的临床肩关节预后评分系统报告关节镜下肩袖修复手术结果时的天花板效应。方法检查了92例行关节镜下肩袖修复的患者。术后2年完成了简单肩关节测试（SST），美国肩肘外科医师（ASES）评分，加利福尼亚大学洛杉矶分校（UCLA）肩膀评分量表和Constant-Murley肩膀评分。使用描述性统计分析对象的人口统计数据。根据先前报告的两个定义，估算了每种量表评估的结果数据中的上限效应。结果SST得分最高的患者为31（33.7％），ASES得分为26（28.3％），UCLA量表为28（30.4％），Constant-Sup评分为18（19.6％）。默里得分。通过SST，ASES评分，UCLA量表和Constant-Murley评分评估的结果数据的标准距离分别为0.92、0.97、0.96和1.18。结论术后2年评估的SST，ASES评分和UCLA量表具有显着的上限效应，表明最大可能评分的患者比例> 20％，标准距离<1.0。研究人员在解释研究关节镜式肩袖修复手术结果的研究结果时，应注意天花板效应可能引起的偏差。这可能会增加II型错误的可能性。证据级别IV。