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Analysis of a retrieved Delta III total shoulder prosthesis

¹ Orthopaedic Hospital, University Lausanne, Av. Pierre-Decker 4, CH-1005 Lausanne, Switzerland.
² Department of Orthopaedic Surgery, University of Zurich, Balgrist, Forchstrasse 340, CH-8008 Zurich, Switzerland.
³ Schulthess Clinic, Lengghalde 2, CH-8008 Zurich, Switzerland.

Correspondence should be sent to Dr R. W. Nyffeler.

A reversed Delta III total shoulder prosthesis was retrieved post-mortem, eight months after implantation. A significant notch was evident at the inferior pole of the scapular neck which extended beyond the inferior fixation screw. This bone loss was associated with a corresponding, erosive defect of the polyethylene cup. Histological examination revealed a chronic foreign-body reaction in the joint capsule. There were, however, no histological signs of loosening of the glenoid base plate and the stability of the prosthetic articulation was only slightly reduced by the eroded rim of the cup.

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