Overview

Patellar tendinitis is an injury to the tendon connecting your kneecap (patella) to your shinbone. The patellar tendon works with the muscles at the front of your thigh to extend your knee so you can kick, run and jump.

Patellar tendinitis, also known as jumper's knee, is most common in athletes whose sports involve frequent jumping — such as basketball and volleyball. However, even people who don't participate in jumping sports can get patellar tendinitis.

For most people, treatment of patellar tendinitis begins with physical therapy to stretch and strengthen the muscles around the knee.

Symptoms

Pain is the first symptom of patellar tendinitis, usually between your kneecap and where the tendon attaches to your shinbone (tibia).

The pain in your knee may:

  • At first be present only as you begin physical activity or just after an intense workout
  • Worsen until it interferes with playing your sport
  • Eventually interfere with daily movements such as climbing stairs or rising from a chair

When to see a doctor

For knee pain, try self-care measures first, such as icing the area and temporarily reducing or avoiding activities that trigger your symptoms.

Call your doctor if your pain:

  • Continues or worsens
  • Interferes with your ability to perform routine daily activities
  • Is associated with swelling or redness about the joint

Causes

Patellar tendinitis is a common overuse injury, caused by repeated stress on your patellar tendon. The stress results in tiny tears in the tendon, which your body attempts to repair. But as the tears in the tendon multiply, they cause pain from inflammation and weakening of the tendon. When this tendon damage persists for more than a few weeks, it's called tendinopathy.

Risk factors

A combination of factors may contribute to the development of patellar tendinitis, including:

  • Physical activity. Running and jumping are most commonly associated with patellar tendinitis. Sudden increases in how hard or how often you engage in the activity also add stress on the tendon, as can changing your running shoes.
  • Tight leg muscles. Tight thigh muscles (quadriceps) and hamstrings, which run up the back of your thighs, can increase strain on your patellar tendon.
  • Muscular imbalance. If some muscles in your legs are much stronger than others, the stronger muscles could pull harder on your patellar tendon. This uneven pull could cause tendinitis.

Complications

If you try to work through your pain, ignoring your body's warning signs, you could cause increasingly larger tears in the patellar tendon. Knee pain and reduced function can persist if you don't tend to the problem, and you may progress to the more serious patellar tendinopathy.

Prevention

To reduce your risk of developing patellar tendinitis, take these steps:

  • Don't play through pain. As soon as you notice exercise-related knee pain, ice the area and rest. Until your knee is pain-free, avoid activities that put stress on your patellar tendon.
  • Strengthen your muscles. Strong thigh muscles are better able to handle the stresses that can cause patellar tendinitis. Eccentric exercises, which involve lowering your leg very slowly after extending your knee, are particularly helpful.
  • Improve your technique. To be sure you're using your body correctly, consider taking lessons or getting professional instructions when starting a new sport or using exercise equipment.
Jan. 08, 2015
References
  1. Patellar tendon tear. American Academy of Orthopaedic Surgeons. http://orthoinfo.aaos.org/topic.cfm?topic=a00512. Accessed Dec. 15, 2014.
  2. Beutler A, et al. Approach to the athlete or active adult with knee pain. http://www.uptodate.com/home. Accessed Dec. 15, 2014.
  3. Rath E, et al. Clinical signs and anatomical correlation of patellar tendinitis. Indian Journal of Orthopaedics. 2010;44:435.
  4. Christian RA, et al. Patellar tendinopathy: Recent developments toward treatment. Bulletin of the Hospital for Joint Diseases. 2014;72:217.
  5. AskMayoExpert. When are platelet-rich plasma (PRP) peripheral injections indicated for tendinopathy? Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2014.
  6. Khan K, et al. Overview of the management of overuse (chronic) tendinopathy. http://www.uptodate.com/home. Accessed Dec. 15, 2014.