[Active acetabulum base stabilization as a supplement to endoprosthesis in polyarthritis-induced acetabular protrusion].

In many cases, rheumatoid arthritis results in protrusio acetabuli. In order to effect a durably stable support over the whole extent of the acetabulum, the active stabilization of the socket base in an endoprothetic joint replacement through a corticospongy plastic is more promising than the application of passive measures. Rheumatoid arthritic persons underwent 127 hip-joint replacements as first-time surgeries. In 47 operations out of the 127, we also carried out the active stabilization of socket bases because of protrusio acetabuli. Through the implantation of corticospongy bone material into the protrusions, socket bases with enough strain capacity could be recreated. Loosenings or reprotrusions were not observed over a period of up to 5 years.