This surgery fixes a torn Achilles tendon. That's the large tendon that connects the calf muscles to the heel. The tear is called a rupture, meaning the tendon has completely torn in two.

Stress fractures are one or more tiny cracks in a bone. These fractures are common in the legs and feet. That's because your legs and feet have to support your weight and absorb the forces of walking, running and jumping.

This condition, commonly called golfer's elbow, is an inflammation of the tendons that connect the muscles of the forearm to the elbow. The pain is primarily felt at the medial epicondyle, the bony bump on the inner side of the elbow.

This is a looseness of the shoulder joint. With it, your arm slides around too much in the socket. It may slip out of the socket easily. Instability can happen because the ligaments that hold your shoulder together aren't tight enough. Or, the cartilage around your shoulder socket may be damaged.

Ligaments are fibrous, elastic bands of tissue that connect and stabilize the bones. An ankle sprain is a common, painful injury that occurs when one or more of the ankle ligaments is stretched beyond the normal range of motion. Sprains can occur as a result of sudden twisting, turning or rolling movements.