The reverse shoulder prosthesis
x-ray of an inverse shoulder prosthesis
Other terms for an inverse shoulder prosthesis are reverse prosthesis, grammont prosthesis or delta prosthesis. All these names are used for this kind of shoulder prosthesis construction. In the end all these terms mean the same. Compared to a conventional shoulder arthroplasty, reverse prostheses are constructed just the other way round. It means: a normal hemiarthroplasty or total shoulder has the "ball" onto the artificial humeral shaft and the articificial glenoid is placed, where the natural glenoid is. Implanting an inverse prothesis the glenoid is placed onto the humeral shaft and the "ball" is positioned onto the area of the natural glenoid.
From a biomechanical point of view the center of rotation, in the shoulder joint, is changed to a more inferior and medial position. So, the inverse prothesis needs only one muscle, the deltoid muscle, to work. A conventional shoulder arthroplasty needs intact rotator cuff muscles for functioning. The rotator cuff muscles are not necessary for a reversed shoulder prothesis to work. Thus, most of the time a reversed shoulder arthroplasty is used in situations where the rotaor cuff is torn and the shoulder destructed due to arthritis. Other situations that make such an implant necessary are fractures.
reverse shoulder prosthesis: the humeral shaft will be prepared
Some years ago omarthrosis with a rotator cuff tear was treated with conventional shoulder arthroplasty. Using a reverse shoulder prosthesis the shoulder function and shoulder pain get better than using convetional implants.
Grammont prosthesis: the "glenosphere" is implanted which means, that the "ball" is placed onto the glenoid surface, after reaming it.
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Other themes & sites arround the shoulder:
Diseases of the shoulder ( german ): http://www.schulterinfo.de , http://www.schulter.info
Diseases of the shoulder ( english ): http://www.shoulderinformation.com
Shoulder arthroplasty: http://www.schulterprothesen.net , http://www.schulterprothesen.com , http://www.shoulderprosthesis.com , http://www.prothesenatlas.de
Frozen shoulder ( german ): http://www.schultersteife.de
Shoulder specialists ( german ): http://www.schulterspezialisten.de
Shoulder examination ( german ): http://www.schulteruntersuchung.de
Shoulder videos ( german ): http://www.schultervideo.de