Definition

Feet usually have an arch on the inside portion of the foot. A flat foot is a foot that has lost or never developed this arch. It is often associated with the lower part of the legs being angled outwards

Most flat feet are flexible. This type rarely causes problems and usually does not require treatment. Rigid flat feet can cause problems and should be treated.

Normal Foot Arch

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Causes

Infants and young children naturally have flat feet. The arch should develop over time. Sometimes, the arch does not develop. It is not always clear why this happens.

Flat feet may develop because of:

    
  • Ruptured or damaged tendon that supports the arch
  • Medical conditions that affect muscles or nerves in the foot
  • Degenerative changes in certain foot joints
  • Ligament damage in the foot
  • Risk Factors

    Factors that increase your chance of flat feet include:

        
  • Family history
  • Diseases that cause muscle or nerve damage, such as peripheral neuropathy, diabetes, cerebral palsy, spina bifida, or muscular dystrophy
  • Foot injuries
  • Conditions of the feet that can injure foot tissue, such as osteoarthritis
  • Conditions present at birth, such as excess laxity of joint capsules and ligaments, such as Ehlers-Danlos syndrome
  • Obesity
  • Symptoms

    Flat feet may not cause any symptoms at all. Rigid flat feet may cause:

        
  • Pain
  • Calluses, blisters, or skin redness on the inner side of the foot
  • A stiff foot
  • Weakness or numbness of the foot
  • Rapid wearing out of shoes—worn shoes lean in toward each other
  • Difficulty or pain with activities like running—in the foot, knee or hip
  • Diagnosis

    The doctor will ask about your symptoms and medical history. A physical and foot exam will be done. Flat feet can be diagnosed by appearance. Doing simple tasks during the exam can help determine if the foot is rigid.

    Treatment

    If the flat foot is rigid and causing problems, treatment will be with a foot specialist. Flat foot treatment options may include:

    Physical Therapy and Exercises

    Physical therapy may relieve discomfort. A specific stretching and strengthening program may be used. Exercises can help with the strength of the surrounding muscles. They may relieve some of the pressure in the foot.

    Orthotics and Support

    Orthotics are shoe inserts that support the foot. These inserts may help to reduce pain and disability in some people. In mild cases, a well-fitting pair of shoes with arch support may be all that is needed.

    Flat feet caused by nerve or muscle disease may need special braces.

    Surgery

    Feet that do not respond to the treatments above may need surgery. The surgery will help to create a supportive arch.

    Prevention

    Well-fitted shoes with good arch support may help prevent flat feet. Maintaining a healthy weight may also lower wear and tear on the arches.