Swimmer's Ear (Otitis Externa) Otitis externa is an infection of the ear canal caused by bacteria or fungi. It often is called swimmer's ear because it is associated with frequent swimming. Shoulder Dislocation A shoulder dislocation occurs when the top of the bone of the upper arm (the humerus) moves out of its usual location in the shoulder joint. Torn Meniscus A meniscus is a disk-shaped piece of cartilage that acts as a shock absorber inside a joint. Leg Fracture In the leg, fractures can occur almost anywhere along the straight shafts of the leg's three long bones - the femur (the thigh bone) and the tibia and fibula in the lower leg. Posterior Cruciate Ligament (PCL) Injuries A PCL injury is a sprain (stretch or tear of a ligament). Fallen Arch A fallen arch or flatfoot is known medically as pes planus. The foot loses the gently curving arch that normally is on the inner side of the sole, just in front of the heel. ACL (Anterior Cruciate Ligament) Injuries The anterior cruciate ligament (ACL) and the posterior cruciate ligament (PCL) are two tough bands of fibrous tissue that connect the femur (thigh bone) and tibia (the large bone of the lower leg) at the knee joint. Heel Pain Heel pain is a common symptom that has many possible causes. Athlete's Foot (Tinea Pedis) Athlete's foot, also known as tinea pedis, is a common foot infection caused by fungi called dermatophytes. Ankle Fracture Whenever a bone breaks or cracks, the injury is called a fracture. In the ankle, three different bones can be fractured.