Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1989-05-05
1991-01-22
Isabella, David J.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
A61F 240
Patent
active
049868330
ABSTRACT:
A glenoid component for an artificial shoulder joint has a retainer having an ultra high molecular weight polyethylene insert affixed thereto. The insert has a concave humerally facing articulating surface on which a ball of the humeral component articulates. The insert also has a fixation tab extending through a slot in the retainer and posteriorly from a scapular facing side of the glenoid component at an oblique angle to the articulating surface. The tab is cemented to the scapula to provide short term fixation of the glenoid component to the scapula. The retainer has a plurality of porous metal coated posts extending posteriorly from the scapular side of the glenoid component at generally the same oblique angle to the articulating surface as the insert's tab. The porous metal coating on the posts promote bone ingrowth therein for long term fixation of the glenoid component to the scapula. The retainer is illustratively made from porous metal coated Ti-6Al-4V. Since the posts and tab extend posteriorly from the scapular side of the glenoid component at an angle thereto, illustratively, at an oblique angle to the articulating surface, the glenoid component can be implanted anteriorly as opposed to laterally. This reduces the amount of exposure and dislocation of the shoulder needed when the glenoid component is implanted.
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