Loudon J R, Charnley J
J Bone Joint Surg Br. 1980 Nov;62-B(4):450-3. doi: 10.1302/0301-620X.62B4.7430222.
A method is described of measuring radiological subsidence of a femoral prosthesis in relation to the femur after total hip arthroplasty. The method depends on measuring the distance from the tip of the femoral prosthesis to a fixed point in the bone. Subsidence after the use of a conventional design of femoral stem is compared with that after the use of a stem with a dorsal flange (Cobra). A significant reduction in the incidence and amount of subsidence was found when using the dorsal flange. There was also a notable absence of transverse fractures involving the cement near the tip of the stem, which occurred in 26 per cent of the cases using a conventional prosthesis.
本文描述了一种测量全髋关节置换术后股骨假体相对于股骨的放射学下沉的方法。该方法依赖于测量从股骨假体尖端到骨内固定点的距离。将使用传统设计股骨干的下沉情况与使用带有背侧凸缘（Cobra）股骨干的下沉情况进行比较。使用背侧凸缘时，下沉的发生率和下沉量显著降低。在使用传统假体的病例中有26%发生了靠近假体尖端的骨水泥横向骨折，而使用带背侧凸缘假体时这种骨折明显减少。
