Uncemented hip prosthesis: a new screw stem model with a review of 73 cases

A new uncemented prosthetic stem based on a screw system is presented. The biomechanical, metallurgic and technical principles on which this innovation is based are discussed. The indication and surgical technique are described and 73 cases are reported. The new stem is easy to apply and makes it possible to regulate anteversion precisely, and above all, to satisfy the preconceived biomechanical requirements. Some cases with a shorter follow-up are included because we allowed a suitable time lapse after our earlier cases before extending our indication. However, there is considerable documentation of screw stems in the literature on the long term toleration of screw stems.