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.
A dislocation of the kneecap occurs when the patella comes completely out of its groove on the end of the thigh bone (femur), and comes to rest on the outside of the knee joint. Kneecap dislocations usually occur as a significant injury the first time the injury occurs, but the kneecap may dislocate much more easily thereafter.
Shoulder pain, stiffness or weakness can make it difficult to carry out everyday tasks, like reaching for something on a high shelf, driving a car or brushing your hair. If you have pain that won’t go away, it’s time to see a doctor.
The sensation of knee instability or weak knees, which many describe as the knee "giving out," may occur suddenly or develop gradually over time. It may be the only symptom of a problem or be accompanied by signs such as popping, locking, pain, bruising, or swelling.