Jumper's knee is an injury of the patellar tendon. The patellar tendon is the cord-like tissue that joins the patella (kneecap) to the tibia (shinbone).
What Are the Signs & Symptoms of Jumper's Knee?
Common symptoms of jumper's knee include:
pain below the kneecap, especially during sports, climbing stairs, and bending the knee
a swollen knee joint
What Causes Jumper's Knee?
Jumper's knee is an overuse injury (when repeated movements injure a part of the body). It happens when frequent jumping, running, and changing direction damages the patellar tendon. It's also called patellar tendonitis.