Hasegawa Masahiro, Sudo Akihiro, Hirata Hitoshi, Uchida Atsumasa
Department of Orthopaedic Surgery, Mie University Faculty of Medicine, Mie, Japan.
J Arthroplasty. 2003 Aug;18(5):658-61. doi: 10.1016/s0883-5403(03)00193-1.
In total hip arthroplasty, a modular acetabular component with a sandwich insertion (alumina ceramics/polyethylene/titanium) was proposed. The polyethylene layer might reduce the rigidity of the ceramics and prevent an impingement between the ceramic liner rim and the femoral neck. A case of an acetabular liner fracture of the ceramic sandwich cup was presented. The fracture occurred 1.4 years after the operation without trauma. Because the ceramic liner rim was hit by the head following the impingement between the neck and the polyethylene, the cause of the fracture might be the stress concentration at the rim of the ceramic liner, of which the thickness was only 4 mm. At revision surgery, the fractured ceramic liner was replaced with a polyethylene liner without inner ceramic liner.
在全髋关节置换术中，有人提出了一种采用三明治式插入结构（氧化铝陶瓷/聚乙烯/钛）的模块化髋臼组件。聚乙烯层可能会降低陶瓷的刚性，并防止陶瓷内衬边缘与股骨颈之间发生撞击。本文报告了一例陶瓷三明治杯髋臼内衬骨折的病例。骨折发生在术后1.4年，无外伤史。由于颈部与聚乙烯之间发生撞击后，陶瓷内衬边缘被股骨头撞击，骨折原因可能是陶瓷内衬边缘的应力集中，其厚度仅为4毫米。在翻修手术中，将断裂的陶瓷内衬更换为无内部陶瓷内衬的聚乙烯内衬。
