Reverse shoulder arthroplasty : Does reduced medialisation improve radiological and clinical results ?

Published online: Apr 27 2009

Ibrahim Kalouche, Nuno Sevivas, Abhijeet Wahegaonker, Philippe Sauzieres, Denis Katz, Philippe Valenti

From the Institut de la Main, Paris, and Ter Clinic, Ploemeur, France


The purpose of this retrospective study was to assess the effect of the reduced medialisation of the ArrowR reverse shoulder prosthesis on short-term clinical and radiological results. The clinical and radiological results of 47 Delta IIIR reverse prostheses and 49 ArrowR reverse prostheses were retrospectively compared at a minimum of twelve months follow-up. There was a significant increase (p < 1.10-4) in range of motion from the preoperative range in the two groups except for internal rotation in the Delta III group (p = 0.1). Radiological analysis on antero-posterior view in neutral position showed greater lateralisation (p < 0.001) with the Arrow prosthesis. Scapular notching was noted in 32 patients with a Delta III prosthesis, and in no instance with an Arrow prosthesis. Complication rates were 14.9% for the Delta group and 10.2% for the Arrow group. The design features of the Arrow prosthesis – reduced medialisation of the center of rotation with lateralisation of the humerus – were found to be associated with slight improvement in range of motion and absence of scapular notching.