Purpose To describe the bilateral coracohumeral morphological discrepancy in rotator cuf rupture patients with and without subscapularis (SSC) involvement and to investigate its association with SSC tears. Methods Two hundred and thirteen consecutive patients who were scheduled to have arthroscopic rotator cuf repair were prospectively enrolled in the current study. Patients with acute traumatic rotator cuf rupture, glenohumeral osteoarthritis, bilateral rotator cuf rupture, recurrent shoulder instability, systemic inlammatory disease, and previous shoulder surgery history were excluded. Coracohumeral distance (CHD), coracoid overlap (CO), lesser tuberosity index (LTI) and acromiohumeral interval (AHI) were measured bilaterally using CT scans. Based on arthroscopic indings, patients were included in either the SSC tear group (n = 72) or the control group (n = 141).
ResultsIn the SSC tear group, the afected shoulder possessed a signiicantly smaller CHD [95% conidence interval (CI) 6.1-7.2 vs. 7.2-8.0 mm, p < 0.0001], larger LTI (95% CI 9.4-9.9 vs. 9.0-9.6 mm, p < 0.0001), and smaller AHI (95% CI 5.0-5.5 vs. 7.1-7.5 mm, p < 0.0001) than the contralateral normal shoulder. In the control group, there was no signiicant diference between bilateral CHD and CO, and the AHI bilateral discrepancy was less distinct. CO did not difer signiicantly in the bilateral comparison in either group. Among all evaluated parameters, bilateral CHD discrepancy was the best predictor of SSC tears, with an area under the curve (AUC) of 0.882. A cutof value of 0.5 mm had a sensitivity of 76.4% and speciicity of 99.3% for SSC tears.
ConclusionThe CHD values are signiicantly diferent between afected and contralateral shoulders in SSC tear patients. Bilateral CHD discrepancy is closely associated with subcoracoid impingement and SSC tears, and its presence warrants speciic intraoperative SSC inspection. Level of evidence Level II.