Article

Reverse shoulder arthroplasty is commonly used to improve the function of
osteoarthritic shoulders in cases with irreparable refractory rotator cuff-tear
arthropathy when conventional prosthesis designs cannot be applied. There is
indication that moving the glenohumeral joint center more medially may lead to
improved shoulder function by extending the lever arm for the deltoid muscle and
facilitating muscle recruitment. However, there is little experimental evidence
for this medialization effect. Marker based motion data of
pre- and one year
postoperative examinations on nine subjects who underwent reverse shoulder
arthroplasty were analyzed applying functional methods for joint center
estimation. The aim was to determine the location of the functional center of
rotation in the operated and the non-operated contralateral side before and after
surgery to verify if the joint center of this reverse prosthesis design is
located more medially compared to the anatomic situation before surgery. It was
shown that the operated shoulders demonstrated a medialization effect of
8.3+/-4.3mm. For the non-operated side the difference was 0.1+/-2.3mm, proving
the accuracy of measurements.
CI - Copyright (c) 2012. Published by Elsevier B.V.

Langue : ANGLAIS