cavum articulare

例句：

1. 1. The doctor performed an arthroscopic surgery on the patient's knee.
   医生对患者的膝盖进行了关节镜手术。
2. 2. The cartilage in the joint was severely damaged due to a sports injury.
   由于运动伤害，关节中的软骨严重受损。
3. 3. The patient was advised to avoid activities that could strain the joint.
   患者被建议避免可能导致关节受伤的活动。