Correlación de la morfología de la glenoides y la cobertura del acromion con rupturas de manguito rotador

Background

The purpose of this study was to determine if there is a difference between the critical shoulder angle measured by MRI in patients with rotator cuff tear and healthy patients, also to evaluate the intraobserver reliability in this measure. Other variables were included as well, lateral acromial extension, acromial height, glenoid version, glenoid inclination and lateral acromial angle.

Materials and methods

Two groups were evaluated, the control group consisted in a total of 16 patients and the group with rotator cuff tear consisted of 15 patients. The critical shoulder angle, glenoid inclination, glenoid version, acromial height, lateral acromial extension and lateral acromial angle were measured on MRI. A student T test was used for comparison of means between both groups, Pearson correlation coefficient was used for evaluating the association between variables. The intraobserver reliability was evaluated using the intraclass correlation coefficient.

Results

A result of 0.961 was obtained for the intraobserver reliability using the intraclass correlation coefficient for the critical shoulder angle. For the comparison of means of the critical shoulder angle in the control group and the rotator cuff tear group a result of 32.3° (3.6) vs. 35.01° (2.4) was obtained with a statistically significant difference of p = 0.02. Likewise, statistically significant differences were obtained in the glenoid inclination and glenoid version in both groups (81.56° SD 4.04 vs 77.11° SD 3.84; p = 0.004) and (−4.47° SD 4.56 vs −1.58° SD 3.94; p = 0.04).

Discussion

Critical shoulder angle measured by MRI is statistically significant different in control group and in rotator cuff tear group.

Evidence Level: III.