An Experimental Study of the Effect of Glenoid Implant Design on Glenohumeral Stability
نویسندگان
چکیده
INTRODUCTION Glenohumeral stability, defined as humeral head translations, is a key point after shoulder arthroplasty. Indeed this parameter is one of the determining factors in the glenoid loosening since linked with the rocking horse effect [1]. In an intact shoulder, translations are controled by all active and passive elements, especially the labrum [2]. In a prosthetic shoulder, translations are influenced by 2 features. The first is the surface congruence (also named conformity or mismatch) defined as the difference of curvature between the prosthetic head and glenoid ; the second is the surface constraints linked with the glenoid prosthetic shape. The objective of this study was also to compare biomechanical results of 2 glenoid components (Ceraver, Roissy, France): (1) a standard design and (2) a design named “labrum design” with a superior part simulating the anatomic labrum.
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