<prompt> An athletic teenage girl complains of anterior knee pain on climbing stairs and on getting up after prolonged sitting. Which of the following is the most likely diagnosis?Chondramalacia PatellaePlica SyndromeBipaite PatellaPatellofemoral osteoahritis  <response>: CAUSES: Mechanical overload of the patellofemoral joint. a Malcongruence - patellofemoral surfaces b Malalignment -- extensor mechanism - weakness of vastus medialis ingle injury -- damage to aicular surface CLINICAL FEATURES Introspective teenage girl or athletic young adult Flat foot Knock kneed athletes Spontaneous Pain in front of knee beneath the knew cap Maybe ho recurrent displacementsinjury Aggravated by activityclimbing down stairsstanding after prolonged sitting with knees flexed Both knees Swelling-give way-catchingnot true locking Gratinggrinding sensation when knee is extended Conservative Rx Reassurance Ice Application Physiotherapy Avoid stressful activities Stretching and strengthening medial quadriceps in 15 mins 4 timesday -- Quad sets bicycling, pool running, swimming flutter kick Aspirin Ibuprofen Naproxen Suppo for a valgus foot STEROIDS BEST AVOIDED ref : maheswari 9th ed 