Definition of phlegm for English Language Learners. : 1  a thick, yellowish liquid that is produced in the nose and throat especially when a person has a cold. : 2  calmness in a difficult or unpleasant situation.
Kneecap (Patellar) Subluxation. A subluxing patella (kneecap) is a temporary, partial dislocation of the kneecap from its normal position in the groove in the end of the thigh bone (femur). This groove is located between two bumps at the end of the thigh bone called the femoral condyles.
Dislocation of the patella occurs when the kneecap is pulled out of the groove on the end of the thigh bone. The kneecap is always pulled to the outside of the groove. Once a patella dislocation occurs, it is much more likely to occur again in the future.