Tā zài xùnliàn zhōng tuǐbù shòushāng, zhǐhǎo tuìchū le bǐsài.
He injured his leg in training and had to pull out of the competition.
Tips
usage
部 'part, region' after a body word gives the body-region terms of medical and descriptive writing: 头部 'head', 胸部 'chest', 腹部 'abdomen', 背部 'back'. In everyday speech people simply say 腿.