Elbow pads and knee pads are essential on a skateboard. 滑滑板时带护肘和护膝是必要的。
The trousers have double thickness knee panels for extra protection. 这条裤子上有双倍厚的护膝片以加强保护。
He put out his right knee in a football match. 在一场足球比赛中他的右膝盖骨脱臼了。
A subluxation occurs when the kneecap is pulled toward the outside of the knee. 当膝盖骨被拉到膝部外面发生半脱位。
One month after completion of the second therapeutic program, the knee pain of both patients had obviously decreased and the patellar positions had markedly improved. 而一个月之后完成第二个疗程，膝盖的疼痛明显缓解并且髌骨的位置有显著的改善。
