英语语法分析

Redislocation occurred in 4 Patients (7% ) , mainly attributed to defective acetabular labium.

术后再脱位失败4个关节（7％），其原因主要是髋臼盂唇缺损。

Both, older than 50 years, had experienced catastrophic early hip redislocation associated with femoral head pathology after the original surgery.

这两名患者年龄大于50岁、均经历了与初次创伤后股骨头病变相关的严重的早期髋关节再脱位。