Brief Outline of Patellar Tendinitis (Jumper’s Knee)
Activities that require repetitive jumping like basketball or volleyball can lead to tendinitis in the patellar (tendon) ligament, also referred to as jumper’s knee. The force placed on the tendon over time can lead to inflammation and pain. The pain is generally felt just below the knee cap.
Anatomy and Physiology of Patellar Tendinitis (Jumper’s Knee)
Patellar tendinitis affects the teno-osseous junctions of the quadriceps tendon as it attaches o the superior pole (extremity) of the patella, and the patellar (tendon) ligament as it attaches the inferior pole of the patella and the tibial tuberosity. Pain is concentrated on the patellar (tendon) ligament, but can also occur at the insertion of the patellar (tendon) ligament into the tibial tuberosity. The patellar (tendon) ligament is involved in extending the lower leg, but is also the first area to experience shock when landing from a jump. It is forced to stretch as the quadriceps to contracts to slow down the flexion of the knee. This repetitive stress can lead to minor trauma in the tendon, which will lead to inflammation. Repetitive flexing and extending of the knee also places stress on this tendon if the tendon does not travel in the required path.
Cause of Patellar Tendinitis (Jumper’s Knee)
Repetitive jumping and landing activities. Running and kicking activities. Untreated minor injury to the patellar tendon.
Signs and Symptoms of Patellar Tendinitis (Jumper’s Knee)
Pain and inflammation of the patellar tendon, especially from repetitive or eccentric knee extension activity or kneeling. Swelling and tenderness around the tendon.
Complications if Left Patellar Tendinitis (Jumper’s Knee) Unattended
As with most tendinitis, inflammation that is left untreated will cause additional irritation, which causes more inflammation, setting up a vicious cycle. This can eventually lead to a rupture of the tendon. Damage to surrounding tissue may also occur.