[Osteosynthesis and simultaneous anchorage of a plastic hip cup in an unstable acetabulum (author' transl)].

Attempts at total hip replacement in the presence of unstable acetabula--which may be caused by a recent fracture or pseudarthrosis--are doomed to failure if conventional implantation technics are used. Such attempts lead inevitably to a rapid loosening of the cup. This article describes a newly developed implant which simultaneously re-establishes acetabular stability while solidly anchoring the cup. Use of this implant contributes to early patient mobilization and undisturbed healing of fractures and pseudarthroses.