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.
Atlantoaxial Subluxation. Lateral radiograph of the cervical spine. There is an increased distance of the predentate space between the anterior surface of the dens and the posterior surface of the anterior tubercle of C1 (white arrow) which should be less than 3 mm in an adult (blue line).