flexion deformity of knee

例句：

1. 1. The patient had a significant knee flexion deformity that required surgery.
   患者有严重的膝关节屈曲畸形，需要进行手术。
2. 2. The doctor advised the patient to avoid activities that could exacerbate the knee flexion deformity.
   医生建议患者避免可能导致膝关节屈曲畸形加重的活动。
3. 3. After the surgery, the patient experienced significant improvement in their knee flexion deformity.
   手术后，患者的膝关节屈曲畸形得到了显著改善。