Patellarfemoral<unk>  syndrome can become a chronic injury, with an estimated 50% of people reporting persistent patellar-femoral<unk>  after a year. Risk factors for a prolonged recovery (or persistent condition) include age (older athletes), females, increased body weight, a reduction in muscle strength, time to seek care, and in those who experience symptoms for more than two months.
Patellofemoral pain syndrome
Chondromalacia patellae
Patellar subluxation syndrome
Patellar tendinitis
Greater trochanteric pain syndrome
Infrapatellar fat pad syndrome
Anterior compartment syndrome
Infrapatellar bursitis