Patellar tendinitis, sometimes referred to as "jumper’s knee," is pain in the kneecap where it connects to the shin. The pain is usually described as an aching pain that arises gradually.

Patellar tendinitis is seen frequently in athletes such as basketball or volleyball players, who repeatedly stress their knees with jumping motions. Treatment for patellar tendinitis includes rest, ice, NSAIDs for pain, and physical therapy to strengthen the muscles and tendons surrounding the knee. Surgery or injections may be considered if pain is severe or chronic.