膝盖骨的

Fauchelevent had dislocated his kneepan in his fall.

割风的膝盖骨跌脱了。

For knee joint ache: The focus of the knee joint is on the both side of the knee, pointed out by binger in the following pictures.

六、膝痛患者：膝痛的病灶在膝盖骨的两侧，手的地方。