Meet Our SurgeonLonnie D. Davis, MD

  • Dr. Davis is like no other...his compassion and kindness is superior! Easy to talk to, explains everything, open to all questions and takes time with you.

    Bonnie - Fairfax VA

  • He did an excellent job on my surgery and follow up. All was as expected. He answers questions thoroughly but does not waste patient time.

    Irene - Reston VA

  • Given the extent of my injury and accident, Dr. Davis did a miraculous job getting me back to normal. He always kept me informed of what to keep an eye on, and how to address certain aspects of my new life adjusting to this injury.

    Jake - Reston VA

  • He was very knowledgeable and excellent at translating what the issue with my knee was from medical terminology into layman's terms. He was extremely thorough and with this being my third opinion on my knee, I immediately decided I would continue through the surgery process with Dr. Davis.

    Eva - Washington DC

  • He is fantastic! Very kind. Smart. Answered my questions. I know nothing. And he was so patient. Treated my son with wonderful kindness and dignity. Dr. Davis is a good man. Glad to have met him! Will definitely go to his office in the future if we have a need for it.

    Jodi - Reston VA

  • It was my first appointment with Dr. Davis and he impressed me with his concern for my wellbeing. He is extremely thorough, spends plenty of time with you and has an excellent bedside manner. I would recommend him to anyone with a sports related injury.

    Lauren - Alexandria VA

  • I'm pretty active and have seen Dr. Lonnie Davis for a number of sports-related injuries for the past few years. I've seen him for a torn ACL, stress fracture in the foot, rock-climbing hand and ankle injuries, etc. I was really impressed with how well my ACL surgery, care and recovery went. He's been great at diagnosing the problems and getting me back to sports.

    Jennie - Annandale VA

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Lonnie D Davis MD

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 orthopedists. To learn more about patellofemoral pain syndrome, let us first learn about normal knee anatomy and function.

Signs and symptoms

Patellofemoral Pain Syndrome can include the following:

  • Pain in front of the knee, under and around the knee cap
  • Increased pain when walking up stairs and especially with walking down stairs.
  • Increased pain with kneeling and squatting
  • Pain can worsen with activity and also occur 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
  • Swelling around the knee can occur but is rare


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


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.


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 orthopedic specialist 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

A form of electromagnetic radiation that is 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.

  • MRI

Magnetic and radio waves are used to create a computer image of 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.


Stay off the injured knee as much as possible and 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

Although uncommon, surgical treatment is sometimes necessary to help relieve the pain if your PFPS persists and does not respond to conservative treatment. Your surgeon may recommend arthroscopy to evaluate your condition and repair or remove any fragmented cartilage.

Useful Links

  • The American Academy of Orthopaedic Surgeons
  • Medical Society of Virginia
  • American Orthopaedic Society for Sports Medicine
  • American Board of Orthopaedic Surgery
  • mid atlantic shoulder elbow society
  • mclean high school
  • STOP Sports Injuries