Internal impingement is a specific type of shoulder injury that is seen primarily in throwing athletes.
Chondromalacia patellae is a term used to describe the damage or softening of the cartilage on the underside of the kneecap. It is similar to patellofemoral pain syndrome (runner's knee) in which the pain is felt under and around the kneecap. This condition is common among young athletics but may also occur in older adults who have arthritis of the knee.
Shoulder pain has several possible causes. If shoulder pain increases as you raise your arm, and the pain is worse than when it’s straight out at 90 degrees, your problem may be impingement.