below-knee amputation

例句：

1. 1. The patientunderwent a below-knee amputation to improve his mobility.
   这名患者接受了膝下截肢术以改善他的活动能力。
2. 2. The doctor advised the patient to undergo a below-knee amputation due to severe infection.
   由于严重的感染，医生建议患者接受膝下截肢术。
3. 3.The below-knee amputation was successful in restoring the patient's ability to walk.
   膝下截肢术成功地恢复了患者的行走能力。