球窝关节的两部分骨结构组成，是一种滑液关节，是最灵活的关节，可移动的骨头末端成圆球状，刚好可以塞入固定骨头的凹槽中，骨头可以旋转及朝各个方向转动。
它毕竟是一个简单的球窝关节；它有一定的载荷；它在有限的生命中需要可靠性；它必须包含适合工作环境的材料。
It is after all a simple ball and socket joint; it has certain loads imposed on it; it needs reliability over a defined life; it must contain materials suitable for the working environment.
球窝关节—在肩膊容许三平面的运动。
Ball and socket joint at shoulder allows movement in 3 planes.
在髋关节病变的“球窝”变成不规则，粗拙，变形，导致疼痛和关节活动范围减小(图1)。
In the diseased hip, the "ball and socket" become irregular, rough, and deformed, causing pain and decreased range of motion (Figure 1).
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