Total hip replacement using APR system

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Abstract
The APR hip system is designed to give maximum immediate stability. The socket is initially fixed with cancellous bone screws. The cancellous-structured titanium pores allow long-term stability by bone ingrowth. The posterior bowed femoral component has a large medial, lateral, and anteroposterior diameter as well as a square stem, which contributes to an optimal match of proximal and distal press-fit and rotatory stability. Proximal-only porous coating for a proximal-only bone ingrowth attachment with a porous coated collar gives maximum proximal transfer of compressive loads and minimizes shear and the threat of distal fixation. The surgical technique described provides excellent exposure for implantation of components. Exposure is improved by release of the quadratus femoris muscle and the gluteus maximus tendon insertion to the femur, which allows retraction of the femur anteriorly to the acetabulum. Closure of the entire posterior hip is accomplished at the completion of the operation. Intraoperative techniques are described for matching the proximal and distal fill of the femur and for developing collar-calcar contact. A step-by-step operative technique for implantation is illustrated

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