Anterior knee pain may be found with patellar instability (subluxation or complete dislocation of the patella out of the trochlear groove) or patellofemoral arthrosis. It may also have no objectively defined cause, in which case the label “patellofemoral pain syndrome” is applied. Many patients with patellofemoral pain syndrome improve with no treatment. Patellar instability may be treated with muscle strengthening therapy or braces; at times, however, surgery is needed.
Full Article - https://www.orthopaedia.com/patellofemoral-disorders/
