膝关节疼痛患者：膝关节疼痛的病灶在膝盖骨的两侧，手指的地方。
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.
婴儿出生的时候是没有膝盖骨的，直到2 - 6周岁的时候才开始生长。
Babies are born without knee caps. They don't appear until the child reaches 2-6 years of age.
这时候，术者会小心地将修整膝盖骨的后部，并用一个小的塑料帽来代替。
If so, the surgeon will carefully trim away the back of the kneecap and replace it with a small plastic cap.
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