[Short-term results (2-5 years) of type Furlong hydroxyapatite-coated hip endoprosthesis].

The short term clinical and radiological results of a hydroxyapatite-coated hip prosthesis with bonding osteogenesis on the hydroxyapatite ceramic and bony tissue reaction had to be studied. 233 patients who had hip replacement were followed up for two to five years and assessed radiologically and by the Merle D'Aubigné rating. Primary total hip arthroplasty as well as revision arthroplasty show sufficient clinical results.

Analogous effects of organic calcium antagonists and magnesium on the epiphyseal growth plate.

High doses of both calcium antagonists and magnesium lead to disorders in the early phase of calcification. Analogous to known mechanisms of calcification outside the bone, the calcium overload of cellular suborganelles, which may play a role in enchondral ossification, is assumed to be prevented or delayed by calcium antagonists and magnesium. In accordance with the relevant literature, which describes analogous cytoprotective effects of calcium antagonists and magnesium in association with extraskeletal calcification and ossification, the qualitative agreement of histologic findings in the epiphyseal growth plate suggests a homologous, primarily intracellular mechanism of action of both magnesium and organic calcium antagonists.

[The mechanical behavior of bone in severe osteoporosis with special reference to the hip endoprosthesis].

The mechanical properties of bone are changed by osteoporosis. A collective of 50 hip endoprostheses was examined for loosening of the acetabular cup and stem, the appearance of para-articular ossification, and the reaction of osteoporotic bone to the implant.

[Experiences with the Mittelmeier ceramic screw acetabulum in exchange operations for loose endoprostheses].

This is a report about our experience with the replacement of loosened acetabular endosprotheses by the self locking ceramic Endoprosthesis Mittelmeier. That's an analysis of 60 patients concerning age, sex incidence, indications, primary implant type and long term findings. The clinical findings are illustrated according to the schedule of Merle d' Aubigné.