Total hip replacement using the APR II system

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Abstract
The APR hip system was originally designed to allow cementless fixation of hip arthroplasty after the poor results of cemented arthroplasty were noted in younger, more active patients. The APR II system is the next generation in this line of proximally porous-coated titanium implants. The anatomic proximal bow and numerous size options maximizes fit of the prosthesis to the cortical bone of the proximal femur, which, along with the porous-coated medial collar, allows for excellent proximal fixation of the prosthesis to bone. Several distal sleeve options allow for excellent fill of the femoral diaphysis to maintain proper alignment and reduce toggle. A proximally grit-blasted stem, specifically designed for cemented fixation, allows for symmetrical cement columns via proximal methacrylate spacers and a distal centralizer. The technique used by the designing surgeon of the APR system (LDD) to produce accurate and reproducible cemented and cementless hip arthroplasty is described in a step by step fashion. The radiographic evaluation of cementless arthroplasty and specific recommendations for when to use cement fixation are also included. © Williams & Wilkins 1991. All Rights Reserved.

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