anterior knee pain due to a structural or functional disturbance in the relation between the patella and distal femur.
pa·tel·lo·fem·o·ral syn·drome
(pă-tel'ō-fem'ŏr-ăl sin'drōm) Degenerative condition affecting the articular cartilage of the patella caused by abnormal compression or shearing forces at the knee joint; may cause patellalgia.