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EMG and Delta Function in Standard RTSA vs Lateralization
Sponsor: Vienna Hospital Association
Summary
Reverse total shoulder arthroplasty (RTSA) is a well-established method to treat patients with irreparable rotator cuff tears and glenohumeral osteoarthritis. The biomechanical principle implies a medialization and distalization of the center of rotation (COR). Deficiencies in internal and external rotation constitute frequently encountered functional problems. Some studies showed reduced activation of the posterior deltoid in EMG measurements, which may explain the inability to compensate these movements. Lateralized prosthetic designs demonstrated increased external rotation through an alteration of the deltoid's lever arm. The aim of the study is to investigate the impact of lateralization on functional outcome and deltoid EMG activity in comparison to a standard implantation technique.
Official title: Postoperative Deltoid EMG Activity and Function in Patients After Reverse Total Shoulder Arthroplasty: A Comparison of Standard Implantation Technique and Lateralization
Key Details
Gender
All
Age Range
60 Years - 85 Years
Study Type
INTERVENTIONAL
Enrollment
130
Start Date
2026-02
Completion Date
2027-12
Last Updated
2026-03-11
Healthy Volunteers
No
Interventions
Lateralization of glenoid component
Lateralization of glenoid component in reverse total shoulder arthroplasty via metal augment on the glenoid side with a thickness of at least 4mm
Standard implantation technique
Implantation of a standard glenoid component without any lateralization via metal back on the glenoid site
Locations (1)
Klinik Donaustadt
Vienna, Austria, Austria