The hip joint is a ball-and-socket joint that connects the femur (thigh bone) to the pelvis. This joint allows for a wide range of motion, enabling movements such as walking, running, and sitting. The structure of the hip joint includes cartilage, which cushions the bones, and synovial fluid, which lubricates the joint. The hip joint is crucial for maintaining balance and stability in the body. It supports the weight of the upper body while standing and during various activities. Proper function of the hip joint is essential for overall mobility and quality of life.