Gradual onset of unilateral, anterior knee pain, nonradiating
Pain worsened by prolonged knee flexion ("moviegoer<unk> ") and stair climbing
Press patella away from femoral condyles while patient contracts the quadriceps
Sudden patellar pain and relaxation of the muscle is positive test
Patellofemoral syndrome
Knee dislocation
Ankle sprain
Knee fractures
Hip bursitis
Patella fracture
Patella dislocation
Segond fracture