<prompt> 15F complains of anterior knee pain, increased on climbing stairs and getting up after prolonged sitting. Diagnosis is:Chondromalacia patellaeBipaite patellaePlica syndromePatellofemoral ahritis  <response>: Given scenario suggests diagnosis of Chondromalacia patellae Plica syndrome- anterior knee pain, clicking, clunking, and a popping sensation on patellofemoral loading activity such as squatting Patellofemoral ahritis will be seen at a later age and will have pain in all movements of knee. Bipaite patella is congenital fragmentation of patella and is usually asymptomatic. 