Journal of shoulder and elbow surgery
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J Shoulder Elbow Surg · Jun 2015
The effect of glenosphere diameter in reverse shoulder arthroplasty on muscle force, joint load, and range of motion.
Little is known about the effects of glenosphere diameter on shoulder joint loads. The purpose of this biomechanical study was to investigate the effects of glenosphere diameter on joint load, load angle, and total deltoid force required for active abduction and range of motion in internal/external rotation and abduction. ⋯ Although increasing glenosphere diameter significantly increased joint load and deltoid force, the clinical impact of these changes is presently unclear. Internal rotation, however, was reduced, which contradicts previous bone modeling studies, which we postulate is due to increased posterior capsular tension as it is forced to wrap around a larger 42 mm implant assembly.
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J Shoulder Elbow Surg · Jun 2015
Comparative StudyArthroscopic repair of a significant (>50%) partial-thickness subscapularis tear concomitant with a full-thickness supraspinatus tear: technical considerations for subscapularis repair (transtendon technique versus tear completion).
The purpose of this study was to compare clinical outcomes and structural integrity of arthroscopic repair by either transtendon repair or tear completion for a significant (>50%) partial-thickness articular-side subscapularis tear associated with a full-thickness supraspinatus tear. ⋯ Arthroscopic repair of partial-thickness subscapularis tears associated with full-thickness supraspinatus tears using either the transtendon technique or tear completion resulted in significant functional improvements in both groups except for postoperative external rotation in group T, and there were no significant differences between groups. The retear rates were also not significantly different between groups. However, after subscapularis repair using the transtendon technique, some patients may have decreased external rotation.