The term 'leg joint' refers to three major joints in the human body: the KNEE, ANKLE, and HIP. The KNEE is a hinge joint located between the femur and tibia bones of the lower leg, allowing for flexion and extension of the leg. The ANKLE is a synovial joint located between the tibia and fibula bones of the lower leg and the talus bone of the foot, allowing for movement in multiple directions. The HIP is a ball-and-socket joint located between the femur and the pelvis, allowing for a wide range of motion.