Prosthetic assembly for a shoulder joint

摘要

The shoulder joint prosthesis consists of a glenoid component with a convex hemispherical head (1) and a scapula fixing, designed to co-operate with a thrust and slip surface on a humeral component fixed in the humeral diaphysis. The centre of rotation (O2) of the head (1) is offset downwards in relation to the median plane and the anatomical centre (O1) socket. This gives a corresponding lowering of the joint head, which has an extension (1c) adjacent to the scapula's external pillar giving an increased adduction rotation to the joint. It also lowers the point of application of efforts which enhance the leverage applied by the deltoid muscle on the abduction movement.