Kneecap Problems

Pain Coming from Patellar Conditions

patella
The kneecap is a common source of knee pain. Jeannot Olivet / Getty Images

The patella, or kneecap, is one of three bones, along with the tibia (shin bone) and femur (thigh bone), that make up the knee joint. All of these bones are covered with a layer of cartilage at points where their surfaces come into contact. Furthermore, the patella is wrapped within a tendon. This tendon connects the quadriceps muscle of the thigh to the shin bone (tibia) below the knee joint.

The patella is important functionally because it increases the leverage of the knee joint.

From a mechanical perspective, the patella allows for an increase of about 30% in strength of extension (kicking) of the leg at the knee joint.

Signs of Kneecap Problems

Problems with the kneecap typically cause pain in the area around the kneecap. Often these symptoms are noticed doing specific activities:

  • Walking stairs (particularly down)
  • Prolonged sitting
  • Kneeling

Kneecap problems can be diagnosed on physical examination by a skilled clinician.  Tests often performed to diagnose kneecap problems include x-rays, MRIs, and other tests.  There are several common problems associated with the kneecap that can cause problems and pain in the knee:

Chondromalacia Patellae (Runner's Knee)
The most common disorder is known as chondromalacia, often called Runner's Knee. Chondromalacia occurs because of irritation of the cartilage on the undersurface of the kneecap.

Prepatellar Bursitis (Housemaid's Knee)
Prepatellar bursitis, or Housemaid's Knee Syndrome, is a condition of swelling and inflammation over the front of the knee.

This is commonly seen in patients who kneel for extended periods, such as carpet layers and gardeners.

Patellar Subluxation
Also called an unstable kneecap, patients who experience this painful knee condition have a patella that does not track evenly within its groove on the femur.

Kneecap Dislocation
When the kneecap comes completely out of its groove, the condition is called a patella dislocation.

When the kneecap dislocates, it must be put back into its groove.

Patellar Tendon Tear
Patellar tendon tears are serious injuries when the tendon connecting the kneecap to the shin is ruptured.  Recovery takes at least 4-6 months, possibly longer for return to sports.

Treatment of Kneecap Problems

Treatment of these various kneecap conditions depends on the diagnosis, however there are some general guidelines that can be followed. For more information, and for a diagnosis of your knee pain, it is important to see your doctor.

  • Rest
    Resting the injured knee to allow time for inflammation to subside is very important. Cross-training will allow you to keep in shape. When you do return to activity, do so gradually.
  • Physical Therapy
    Physical therapy is very important to balance the strength of the muscles around the knee joint. Most importantly, the quad and hamstring muscle groups should be flexible and balanced.
  • Ice the Injury
    Apply ice to the knee to cool down inflammation in stimulate blood flow to the area. Be careful not to ice too much!
  • Anti-Inflammatory Medications
    Anti-inflammatory medications may help with inflammation and will also help alleviate some of the pain associated with patella conditions.
  • Arthroscopic Surgery
    While surgery is seldom needed because of a kneecap problem, arthroscopy is a treatment option if the problem is not getting any better with conservative treatment.
  • Kneecap Stabilization
    When the problem with the kneecap is an issue with dislocation or instability, there are several surgical options to stabilize the kneecap.
  • Patellar Resurfacing
    There are surgical options to replace the kneecap.  Much like people have a full knee replacement, just the kneecap portion of the joint can be replaced.

Sources:

Post WR. "Anterior Knee Pain: Diagnosis and Treatment" J. Am. Acad. Ortho. Surg., December 2005; 13: 534 - 543.

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