tailieunhanh - Mô đun của Cấy ghép Giả

Phần lớn các thành phần của tổng số doanh thay thế hiện đang sử dụng mô-đun ở một mức độ nào đó. Mô đun làm giảm hàng tồn kho và làm tăng lựa chọn của bác sĩ phẫu thuật trong arthroplasty tổng doanh chính và sửa đổi. Sử dụng một giao diện mô đun, tuy nhiên, làm tăng nguy cơ phiền muộn, | Modularity of Prosthetic Implants Robert L. Barrack MD Abstract The vast majority of total-joint-replacement components currently utilized are modular to some degree. Modularity reduces inventory and increases the surgeon s options in both primary and revision total-joint arthroplasty. Use of a modular interface however increases the risk of fretting wear debris and dissociation and mismatching of components. The use of modular heads in total hip replacement is firmly established. The occurrence of corrosion and fretting has been recognized and most manufacturers have improved the quality of the interface to minimize these problems. Modular polyethylene liners also offer advantages particularly in revision procedures where the option of additional screw fixation remains important. Many uncemented acetabular components are inserted without screws which may generate renewed interest in one-piece factory-preassembled components. The conformity locking mechanism and nonarticular interface of modular acetabular components have all been studied and improved. Modular tibial components offer additional flexibility in the performance of total knee replacement but introduce the risk of dissociation and increased polyethylene wear in revision procedures modularity provides a valuable option for dealing with bone loss and an additional method of fixation by means of press-fit stems. Modular humeral components offer a significant advantage with limited apparent risk however longer clinical experience is required to assess potential problems. J Am Acad Orthop Surg 1994 2 16-25 A modular total-joint-replacement component is generally defined as one that the surgeon assembles at the time of implantation. Two-piece components were originally designed to allow replacement of the polyethylene liner or to provide a metal backing which theoretically improves stress distribution. Later a metal backing became necessary to provide a metal surface for porous coating. With the advent of .

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