[Acetabulum without cement. Short-term results of a series of 112 threaded cups].

Between January 1982 and December 1987 we used 112 threaded acetabular cups in 102 patients undergoing total hip replacement. The clinical and radiographic results of 107 implants are reported in this survey. Using the functional grading of the hip advocated by Merle d'Aubigné and Postel, 62% can be classified as excellent, very good or good.

[Bone anchorage and surface condition of the implant. Validity of extraction tests].

The mechanical strength of the bone-implant interface depends on the morphology and the composition of the implant surface. The great variety of coating materials as well as the condition of the surfaces to be covered, makes a comparative and preclinical evaluation of the different materials for prostheses necessary. The results, the validity and the limits of the extraction tests are discussed in this article.