The reverse shoulder prosthesis


reverse shoulder prothesis, Grammont prosthesis, Delta arthroplasty


What is a reversed 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.


How a reversed shoulder prosthesis works:
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 rotator cuff is torn and the shoulder destructed due to arthritis. Other situations that make such an implant necessary are more part fractures of the humeral head.
Some years ago arthritis of the shoulder combined 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 conventional implants.


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