Interpretation Shoulders with a total shoulder arthroplasty are stronger. This can be explained by the absence of rotator cuff muscles and (probably) medialized center of rotation in reverse shoulder arthroplasty. The strong correlation between external rotation torques and post-operative Constant-Murley sub-scores demonstrates that external rotation is essential for good clinical functioning in reverse shoulder arthroplasty.
Alta, T. D. W., Veeger, H. E. J., de Toledo, J. S., Janssen, T. W. J., & Willems, W. J. (2014). Isokinetic strength differences between patients with primary reverse and total shoulder prostheses: Muscle strength quantified with a dynamometer. Clinical Biomechanics, 29(9), 965-970. https://doi.org/10.1016/j.clinbiomech.2014.08.018