title: Problems of the knee extensor mechanism.
mesh_terms: D006801:Humans; D007718:Knee Injuries / Q000175:diagnosis*; D007719:Knee Joint / Q000033:anatomy & histology / Q000502:physiology; D009132:Muscles / Q000293:injuries; D010329:Patella / Q000293:injuries; D013708:Tendon Injuries / Q000175:diagnosis