joint spacer

例句：

1. 1. The doctor recommended a joint spacer to help with the pain.
   医生推荐了关节垫片来帮助缓解疼痛。
2. 2. The patient needed a joint spacer to support his injured knee.
   患者需要关节垫片来支撑他的受伤膝盖。
3. 3.The joint spacer helped to reduce friction and improve mobility in the joint.
   关节垫片有助于减少摩擦并改善关节的活动能力。