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.
The tendon of the thigh muscle normally slides in a groove on the upper leg bone (femur; femoral groove) as the knee joint moves. When a patellar dislocation (luxation) occurs, the patella typically shifts toward the outside (lateral) aspect of the knee joint, leaving the femoral groove.