Rhoads David P, Baker Kevin C, Israel Raj, Greene Perry W
Department of Orthopaedic Surgery, William Beaumont Hospital, Royal Oak, Michigan, USA.
J Arthroplasty. 2008 Dec;23(8):1239.e25-30. doi: 10.1016/j.arth.2007.09.017. Epub 2008 Apr 11.
A case report regarding the fracture of an alumina ceramic femoral head used in ceramic-on-ceramic total hip arthroplasty is presented. The patient, who was seen in the emergency room with pain, grinding, and instability in the hip immediately after a slip-without-fall event, also reported having fallen from a height of 8 ft 6 months earlier. Characterization of the alumina fracture surfaces by light and scanning electron microscopy suggests that the previous fall may have favored the nucleation and growth of subcritical cracks in the ceramic, which lead to fracture during the slip-without-fall event. The case report addresses the significance of impact trauma on the structural integrity of ceramic materials, which should not be ignored by patient or physician regardless of perceived severity.
本文报告了一例陶瓷对陶瓷全髋关节置换术中使用的氧化铝陶瓷股骨头骨折的病例。该患者在一次未摔倒的滑倒事件后立即因髋部疼痛、摩擦和不稳定被送往急诊室，患者还报告6个月前曾从8英尺高处坠落。通过光学显微镜和扫描电子显微镜对氧化铝骨折表面进行表征表明，先前的坠落可能促进了陶瓷中亚临界裂纹的成核和生长，导致在未摔倒的滑倒事件中发生骨折。该病例报告阐述了冲击创伤对陶瓷材料结构完整性的重要性，无论患者或医生认为严重程度如何，都不应忽视这一点。
