Patella Pain

Patellofemoral pain syndrome

Patellofemoral pain syndrome, also referred to as PFPS, is one of the most commonly reported knee problems, accounting for one in four knee complaints seen by orthopaedists.

Signs and symptoms

Pain in front of the knee, under and around the knee cap
Increased pain when walking up or down stairs
Increased pain with kneeling and squatting
Pain can worsen with activity and also with long bouts of inactivity
Pain can occur in one or both knees
Pain is usually described as “aching” but can also be “sharp” or “ burning” pain
A sensation that the knee may “give out” is often reported
A grinding sensation can be felt or heard when the knee is extended
Snapping or popping on one side of the knee cap
Swelling around the knee can occur

Causes

Patellofemoral pain syndrome is caused by a multitude of factors that affect the way the patella moves along the groove of the femur (trochlear groove) when the leg is bent or straightened. The patella normally moves up and down with a slight tilt without touching the other knee bones. In PFPS patients, the patella rubs against the femur causing pain.

A combination of factors can cause this abnormal tracking and include the following:

Overuse/overload injury: Repeated weight-bearing impact sports such as soccer and running can cause PFPS.
Anatomical defect: Flat feet and high arches can cause misalignment of the knee joint.
Weak quadriceps muscles: Quadriceps, the anterior thigh muscles, function to help hold the kneecap in place during movement. Weak thigh muscles can lead to abnormal tracking of the patella, causing it to rub against the femur, producing pain in the kneecap.

Risk Factors

Anyone can develop patellofemoral pain at any point in their lives; however there are certain risk factors that may predispose you to developing patellofemoral pain. These include the following:

Starting a new physical activity
Increasing the intensity of a physical activity too quickly
Injury or trauma to the kneecap can lead to recurring episodes of instability
Unusual alignment of the kneecap
Arthritis
Obesity
Weak or tight thigh muscles
Flat feet, knock knees, or high arches
Females are affected more than men as wider hips increase stress on the kneecap
Commonly seen in young athletes

Prevention

Although it may not always be possible to prevent patellofemoral pain syndrome, there are some measures you can take to decrease your risk.

These include:

Appropriate warm-up prior to beginning an activity
Alternate high impact activities with low impact activities
Run on softer surfaces
Gradually increase distance or intensity level
Proper footwear for your activity is essential
Strengthening your quadriceps to prevent abnormal tracking of the patella
Stop the activity if symptoms of PFPS occur with a gradual return once symptoms improve.

Diagnosis

Evaluating the source of patellofemoral pain is critical in determining your treatment options for relief of the pain. Knee pain should be evaluated by an orthopaedist for proper diagnosis and treatment.

Your physician will perform the following:

Medical History
Physical Examination

Depending on what the history and exam reveal, your doctor may order medical tests to determine the cause of your knee pain and to rule out other conditions.

Diagnostic Studies may include:

X-rays

Used to take pictures of bones

CT Scan

This test creates 3D images from multiple X-rays and shows your physician structures not seen on regular X-ray.

Magnetic and radio waves are used to create computer images of the bones and soft tissue such as nerves and ligaments.

Treatment Options: Acute

Treatment for patellofemoral pain will depend on the exact cause of the pain and whether the pain is acute or chronic.

Treatment guidelines for acute PFPS include:

Pain Medications:

Over the counter NSAID’s (non-steroidal anti-inflammatory drugs) such as ibuprofen can help with the pain and any swelling.

Rest:

Avoid activities that cause the pain as more damage could result from putting pressure on the injury. You can perform non-weight bearing activities such as swimming. Slow, gradual resumption of activities.

Ice: Ice packs applied to the injury will help diminish swelling and pain. Ice should be applied over a towel to the affected area for 20 minutes every hour. Never place ice directly over the skin.

Treatment Options: Chronic

If your knee pain persists despite the above treatments, your doctor may suggest more intensive treatments. These may include the following:

Physical Therapy:

PT can teach you the proper stretching and strengthening exercises appropriate for your condition. Weak or tight quadriceps (thigh muscles) is a common cause of PFPS, so focusing on this muscle group is a primary focus for treatment of PFPS. If the cause of your knee pain is a different muscle group, such as hamstrings, your therapist will individualize your exercises accordingly.

Bracing: Soft braces with cut outs over the patella may be suggested for support and alignment.

Taping: Your therapist may show you how to tape the knee to bring it into proper alignment.

Orthotics: Shoe inserts may be ordered when PFPS is caused by foot abnormalities, such as flat feet.

Treatment Options: Surgery

Approximately 80% of patient with PFPS have satisfactory resolution of their symptoms with conservative treatment. For the 20% of patients with persistent kneecap pain despite conservative treatment, surgical treatment is sometimes necessary.. Common reasons for persistent kneecap pain despite conservative treatment include abnormal tracking of the patella, synovitis with soft tissue impingement, plica band syndrome and recurrent dislocation of the patella. Your surgeon may recommend arthroscopy to evaluate your condition and repair or remove excessive synovial tissue, plica bands, fragmented cartilage or to perform a lateral retinacular release.