Patellar tendinitis (jumper’s knee) is painful irritation of the strong fibrous band that connects your kneecap to your shine bone. Symptoms of patellar tendinopathy include pain or swelling just below your kneecap, which worsens during activities that require strong quadriceps contraction, like jumping, squatting, rising from a seated position, and stair climbing or running, especially downstairs or downhill. 

The condition is caused by repetitive straining and micro-tearing. Jumping, squatting, or repetitive stair climbing or bending may cause worsening symptoms.

Conservative care, including a well-planned strengthening program, will usually solve the problem. Initially, you may need to decrease your training intensity to help protect your knee. You should stay active but avoid activities that cause more than mild pain. Patellar tendon straps, like a Cho-Pat, can help reduce stress on your patellar tendon and help manage pain in most patients. Ice packs or ice massages for 10-15 minutes may help reduce inflammation, especially following activity.