Symptoms of Patellar Tendonitis
The main symptom of patellar tendonitis is pain and tenderness just below the kneecap.

The pain usually starts after exercise, and continued exercise will likely increase the discomfort. Jumping, running, and landing are likely to make the pain worse.

A person may begin to notice weakness in the knee, particularly during exercises that put pressure on this part of the body.

When the leg is straight, the area below the knee may feel tender when touched. The area around the knee can also feel tight or stiff, particularly first thing in the morning.

A large tear of the patella tendon is a serious injury, and a complete tear will separate the tendon from the kneecap. A person may hear a tearing or popping sound, and will feel significant pain. The knee may also swell and bruise. Walking may be difficult and a person may be unable to straighten the leg.