骨质弹性降低后就不能承受正常生活中的慢性重复性压力。衰竭骨折常发生于那些脆弱的骨骼。引起骨质抵抗力减低的原因很多。最常见的原因有:绝经后的骨质疏松,类固醇治疗后及长期应用化疗等。衰竭骨折多发生于骨盆和下肢如耻骨、髂骨、骶骨等,而髋臼上的衰竭骨折较少见,因此不 After the reduction of bone elasticity can not withstand the chronic reproductive stress in normal life. Failure fractures often occur in those vulnerable bones. There are many reasons for the decrease in bone resistance. The most common reasons are: postmenopausal osteoporosis, steroid therapy and long-term use of chemotherapy. Failure fractures occur in the pelvis and lower limbs such as pubis, ilium, sacrum, etc., and the failure of the acetabulum fractures less common, so not