The hip joint is one of the most important joints in the human body. It allows us to walk, run, and jump. It bears our bodyââ¬â¢s weight and the force of the strong muscles of the hip and leg. Yet the hip joint is also one of our most flexible joints and allows a greater range of motion than all other joints in the body except for the shoulder. The hip joint is a ball-and-socket synovial joint formed between the os coxa (hip bone) and the femur.