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.
Patellar Subluxation. Definition: Patellar subluxation occurs when the kneecap (the patella) is partially and temporarily dislocated from its normal alignment within the knee joint. Patellar tracking disorder is similar, in that the kneecap is not kept within its normal position, but it occurs on a regular basis as the knee bends and straightens.