他的膝盖因关节炎而变得骨节突出。

His knees became ___knobby due to arthritis.

那个瘦高的孩子膝盖骨节突出，在短裤下清晰可见。

The lanky kid had ___knobby knees that were clearly visible under his shorts.

爷爷的手杖顶端有一个节状的突起。

The top of grandpa's cane has a ___knobby shape.