The crossword solution for the term 'Knee Counterpart' is 'ELBOW' (5 letters). The ELBOW is the joint located between the upper arm and the forearm. It is a hinge joint that allows the arm to bend and straighten. The ELBOW is the counterpart to the knee, which is the joint located between the thigh and the lower leg. Both the ELBOW and the knee are important joints in the body that allow us to move our arms and legs.