Hinge joint and Knee joint

Hinge joint noun - A freely moving joint in which the bones are so articulated as to allow extensive movement in one plane.

Knee joint and hinge joint are semantically related. In some cases you can replace phrase "Knee joint" with "Hinge joint", this phrases are similar.

Knee joint noun - Hinge joint in the human leg connecting the tibia and fibula with the femur and protected in front by the patella.

Hinge joint and knee joint are semantically related. You can use "Hinge joint" instead a noun phrase "Knee joint".