英语语法分析

One patient had a previous patellectomy.

一个病人先前有髌股切除手术史。

Objective Study on how to strengthen knee extension function following patellectomy.

目的探讨髌骨切除后加强伸膝肌力的方法。

Objective to investigate the clinical effects of tension band internal fixation of patella, partial patellectomy and modified partial patellectomy on displaced fracture of patella in the elderly.

目的评价髌骨张力带内固定术、部分切除术及改良式部分髌骨切除术治疗老年移位性髌骨骨折的疗效。