Electromyographic analysis of reverse total shoulder arthroplasties
Reverse Total Shoulder Replacements (RTSR) have gained popularity in recent years, an awareness of muscle activity following RTSR can help develop the procedure further. This study evaluated deltoid and upper trapezius activity during shoulder abduction, flexion, and external rotation in RTSR patients.
33 RSTR patients and 17 controls were recruited; Control individuals easily performed all functional tasks and had no history of shoulder pathology. RTSR participants were divided into 3 groups according to implant design.
Participants performed weighted and unweighted abduction in the coronal plane, forward flexion in the sagittal plane, and unweighted external rotation whilst undergoing EMG recordings and 3D motion capture.
RTSR results in increased deltoid and upper trapezius activity during flexion and abduction; Medial glenosphere/medial humerus shoulders were most similar to the control group’s anterior, lateral, and posterior deltoid muscle activation during weighted flexion.
RTSR may restore stability and motion; however the procedure increases muscles activation compared with normal shoulders questioning the procedure’s efficiency and has implications for post-operative rehabilitation. > From Walker, et al. J Shoulder Elbow Surg 23 (2014) 166-172. All rights reserved to Elsevier Ltd.
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