AI Summary & Key Takeaways
AI InsightHowever, superior rotator cuff tears can still lead to SHM and subacromial impingement even when subscapularis tendon is intact.Level of evidence: Level III, diagnostic study.
📌 3 Key Takeaways
Abstract
Objectives: The aim of this study was to analyse the effect of subscapularis tear on superior humeralexcursion (SHE) and acromiohumeral distance (AHD). The hypothesis was that subscapularis tears do notresult in superior humeral excursion.Methods: Patients who underwent shoulder arthroscopy between August of 2011 and 2015 werereevaluated. Those with isolated Bankart lesion were used as control group and included in the Group 1,isolated full-thickness supraspinatus tear in the Group 2, isolated subscapularis tear in the Group 3, andcombined subscapularis and supraspinatus tear in the Group 4. The mean SHE and AHD measurementson magnetic resonance imaging of these groups were compared to reveal any difference in superiorhumeral migration (SHM).Results: There were 30 patients in each group. The mean age of Group 1 (26.44± 8.34) was younger thanthe other 3 groups. The mean AHD and SHE were higher in Group 1 and 3 (Mean AHD: 12.89± 2.24 and12.28± 1.9, respectively. Mean SHE: 3.2 ± 0.99 and 2.78 ± 0.64, respectively) than Group 2 and 4(Mean AHD: 6.2± 1.78 and 6.16 ± 1.52, respectively. Mean SHE: 0.72 ± 0.65 and 1.24 ± 0.63, respectively).The AHD and SHE were strongly correlated with each other (Pearson correlation coefŞcient ¼ 0.184). Theinter-observer and intra-observer correlation of the measurements of SHE on MRI were excellent withintraclass correlation coefŞcient of 0.95 and 0.94, respectively.Conclusion: Subscapularis tears do not lead to SHM and subacromial impingement. However, superior rotator cuff tears can still lead to SHM and subacromial impingement even when subscapularis tendon is intact.Level of evidence: Level III, diagnostic study.