Abstract
BackgroundMany radiographic parameters associated with the extrinsic cause of supraspinatus tears have been proposed. The aim of this study was to assess the relationship between a full-thickness degenerative supraspinatus tear (FTDST) and the patient’s radiographic parameters, including the acromiohumeral centre edge angle (ACEA) and the greater tuberosity angle (GTA).MethodsA retrospective study was conducted. We included 116 patients who underwent shoulder arthroscopic surgery at our institute. The case group included FTDST patients, whereas the control group also included patients without evidence of supraspinatus tears. In each patient, the ACEA and GTA values were measured and analyzed by two independent observers. Intra- and interobserver reliabilities were assessed. Multivariate regression analysis was performed.ResultsThe ACEA values were significantly increased in the FTDST group with a mean of 26.44° ± 9.83° compared with 16.81° ± 7.72° in the control group (P < 0.001). Multivariate regression analysis also showed that higher ACEA values were associated with an FTDST (odds ratio 1.16 per degree, P = 0.01). For GTA values, a statistically significant difference was found with a mean of 70.92° ± 6.64 compared with 67.84° ± 5.56 in the control group (P = 0.02). However, stepwise regression analysis did not indicate that GTA was a predictor of FTDST.ConclusionsOur study demonstrated that the presence of increased ACEA values is an independent significant risk factor for the presence of FTDSTs. Consequently, GTA values may be less helpful in assessing the risk of FTDST, especially in this specific population.
Highlights
Many radiographic parameters associated with the extrinsic cause of supraspinatus tears have been proposed
Extrinsic causes for Rotator cuff tear (RCT) are usually associated with subacromial impingement [2], which is defined by the supraspinatus (SSP) tendon becoming entrapped between the acromion process and Vijittrakarnrung et al BMC Musculoskelet Disord (2021) 22:607 the greater tuberosity
Our findings showed that while the mean acromiohumeral centre edge angle (ACEA) and greater tuberosity angle (GTA) values of the full-thickness degenerative supraspinatus tear (FTDST) group were greater than those of the control group, the means of the parameters among subgroups categorized by Patte classification did not show a significant difference
Summary
Many radiographic parameters associated with the extrinsic cause of supraspinatus tears have been proposed. The aim of this study was to assess the relationship between a full-thickness degenerative supraspinatus tear (FTDST) and the patient’s radiographic parameters, including the acromiohumeral centre edge angle (ACEA) and the greater tuberosity angle (GTA). Extrinsic causes for RCTs are usually associated with subacromial impingement [2], which is defined by the supraspinatus (SSP) tendon becoming entrapped between the acromion process and Vijittrakarnrung et al BMC Musculoskelet Disord (2021) 22:607 the greater tuberosity. The greater tuberosity angle (GTA), a new radiographic marker that evaluates the GT position proposed by Cunningham et al, has been advocated as a reliable predictor marker for RCTs. Cunningham et al suggested that the development of degenerative RCTs [9] was associated with higher GTA values. The specific full-thickness degenerative supraspinatus tear (FTDST) subgroup correlation with these parameters should be determined
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