A joint, such as the elbow, in which a convex part of one bone fits into a concave part of another, allowing motion in only one plane.

• 屈戌关节,绞链关节：屈戌关节（如肘），一块骨的凸出部分与另一块骨的凹进部分吻合，可以允许在一个水平面中运动