Pain referred to area of<unk>  tendon
Pain worsened with going from sitting to standing and running (especially uphill)
Point tenderness at distal aspect of<unk> or proximal part of<unk>  tendon
Point tenderness at distal aspect of<unk> or proximal part of<unk>  tendon
Patellar tendonitis
Knee dislocation
Hip bursitis
Knee fractures
Prepatellar bursitis 
Patella fracture
Pes anserine bursitis
Segond fracture