<unk>  <unk> ; not to be confused with jumper's knee) is knee pain as a result of problems between the kneecap and the femur. The pain is generally in the front of the knee and comes on gradually. Pain may worsen with sitting, excessive use, or climbing and descending stairs. While the exact cause is unclear, it is believed to be due to overuse. Risk factors include trauma, increased training, and a weak quadriceps muscle. It is particularly common among runners. The diagnosis is generally based on the symptoms and examination. If pushing the kneecap into the femur increases the pain, the diagnosis is more likely. Treatment typically involves rest and rehabilitation with an Exercise Physiologist. Runners may need to switch to activities such as cycling or swimming. Insoles may help some people. Symptoms may last for years despite treatment.<unk>  is the most common cause of knee pain, affecting more than 20% of young adults. It occurs about 2.5 times more often in females than males.
Patellofemoral pain syndrome
Chondromalacia patellae
Patellar subluxation syndrome
Patellar tendinitis
Greater trochanteric pain syndrome
Infrapatellar fat pad syndrome
Anterior compartment syndrome
Infrapatellar bursitis