Patellar tendonitis is an injury to the tendon connecting your kneecap (patella) to your shinbone.
The patellar tendon works with the muscles at the front of your thigh to extend your knee so that you can kick, run and jump.
Patellar tendonitis, also known as jumper's knee, is most common in athletes whose sports involve frequent jumping, such as basketball and volleyball.
Anyone, however, can get patellar tendonitis.
The first symptom of patellar tendonitis is pain between your kneecap and where the tendon attaches to your shinbone (tibia).
Patellar tendonitis is a common overuse injury, caused by repeated stress on your patellar tendon. The stress results in tiny tears and as these tears multiply, the tendon weakens and becomes inflamed. Tendinopathy is diagnosed when this damage persists for more than a few weeks.
For most people, treatment of patellar tendonitis begins with physical therapy to stretch and strengthen the muscles surrounding the knee.
Make sure your shoes fit well and provide good shock absorption. If you have flat feet, consider shoe inserts.
Orthotics can help align and stabilize your foot and ankle, taking stress from your lower leg.