Various joints present various challenges to surgeons.
Some of your joints, although quite small, carry very large loads. Because of this, the amount of stress or load applied to a particular implant is high. For example, as you carry heavy loads using your arms or twist to move a heavy item from one place to another, the forces generated can make it difficult to design joint implants that resist loosening. Your hip allows you to make a variety of movements. These bones are separated by cartilage that acts as a cushion.