The fracture and the surface of a hip joint fractured invivo has been studied by SEM.It is concluded that the fracture was due to corrosion fatigue cracking by bending stress.

• 利用SEM对实际使用时断裂的髋关节的断口和表面进行了分析,认为此关节的断裂为以弯曲应力为主的腐蚀疲劳断裂。