Indications for and surgical techniques in surface prostheses: Our experience [Indicazioni e tecnica chirurgica nelle protesi di superficie la nostra esperienza]

Aim. Prosthetic hip resurfacing is not a novel concept. Metal-on-polyethylene coupled prostheses implanted in the 1970s and early 1980s produced poor outcomes. The results of implantation of metal-on-metal coupled devices in large case series with adequate follow-up periods are now beginning to emerge. The choice of a surgical technique consistent with the device's biomechanics remains a vital consideration. Methods. From 4 November 2004 to 7 June 2005, 9 ASR Depuy hip prostheses were implanted in 8 patients (1 bilateral implantation) at the Department of Orthopedics and Traumatology, Asti Community Hospital. The instrumentarium furnished by the prosthesis manufacturer was used to place the devices. Results. The small number of implants and short follow-up periods do not provide enough data for achieving a statistically significant analysis of device survival. What can be stated is that no mobilization or dislocation of the prostheses has been observed to date. Patient satisfaction with the outcome was excellent. Conclusion. Based on our experience and the clinical outcomes, we believe that the metal-on-metal surface devices with a cemented femoral component may ensure good implant stability and good resistance to component wear comparable with those offered by conventional prostheses.