Middle of the leg (4)

I believe the answer is:
knee
(Other definitions for knee that I've seen before include "One has a cap" , "middle part of leg" , "Capped joint?" , "Where the femur meets the tibia" , "joint input" .)
I believe the answer is:
knee
(Other definitions for knee that I've seen before include "One has a cap" , "middle part of leg" , "Capped joint?" , "Where the femur meets the tibia" , "joint input" .)