LINK C.F.P. HIP PROSTHESIS – HISTORY AND PHILOSOPHY OF NECK PRESERVING

Abstract

The neck is the firmer structure of the proximal femur designed to spread the stresses both in compression and tension towards the metadiaphisys and the greater trochanter. Therefore femural neck preserving in total hip arthroplasty allows an optimized stresses’ distribution to obtain both an optimal integration and a subsequent better bone remodelling. The solidity of the structure and the geometric architecture with a femural neck angle of 125° guarantee the maximum primary stability, especially torsional of the stem. At last femural neck retaining allows, when requested, the revision with a richer bone-stock. For the aforementioned reasons since 1979 I proposed the femural neck preservation making a short cementless stem named Biodinamica. From 1983 to 1996 I personally implanted 498 Biodinamica prostheses with very satisfactory results showing a long term survival of the 98% (f.up 13 to 17 years). In 1996 with Ing. Keller it has been created the C.F.P. stem with the T.O.P. acetabular cup as evolution of Biodinamica system. The improvements are critical: materials have changed (from Cr-Co-Mb to Ti alloy), coating and design too. We report clinical and radiographical results of 10 years of C.F.P. implants that showed a further improvement, not only about the prosthesis’ survival, but especially regarding their quality with a 91% excellent clinical outcome. In conclusion we report the 25 years experience retaining the femural neck in hip arthroplasty with Biodinamica (498) and after C.F.P. (445) of a complessive cases of 943 arthroplasty.