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.
While a dislocation is a complete disunion, or separation, between the two articulating bones of the synovial joint, a subluxation is an incomplete disunion of the two articulating bones. In the case of a subluxation, the two bones that meet up will partially separate from each other and return to their normal position. This process is called spontaneous reduction. The bones continue to touch each other along the articulating surfaces, but not in the same nature as if they were not injured.