Hips are made up of two ball and socket joints that fit together in a way to withstand a lot of wear and tear, with a cushion of cartilage inside that allows for fluid movement. The cartilage helps prevent friction as the hip bone moves in its socket, but with time tends to wear down or become damaged.
Muscles and tendons attached to the hip may also get torn, stretched or overused. The hip bone itself could also be fractured during a fall or injury. When this happens, individuals might experience serious hip pain, which leads to the inability to walk properly or move freely.