Of the many body parts we benignly neglect, our feet may be the most taken for granted. They get us where we need to go, supporting a lot of weight given their size relative to the rest of our bodies. They are structurally complex, comprising 26 bones, 33 joints, and 100+ muscles, tendons, and ligaments apiece. Indeed, over a quarter of the bones in the body are located in the feet. Most human feet have arches much like the ones in some bridges and other architectural structures. And much like these man-made structures, our bipedal arch turns out to be a useful engineering phenomenon. ?The arches distribute weight evenly across the feet and up the legs, and can affect walking. A well-developed arch is balanced between rigidity (for stability and flexibility (for adapting to surfaces). What, then, are the implications of fallen arches, otherwise known as flat feet, where no or little foot arch exists and the instep of the foot touches the ground? There are two types of flat feet. A person with flexible flat feet has some arch, especially when standing on the toes. A person with rigid flat feet has no arch whatsoever. Infants usually have flat feet, with the arch developing in childhood.
Having low or no arches is normal for some people. In these cases, flat feet are usually inherited and the feet are fairly flexible. Occasionally, flat feet can be caused by an abnormality that develops in the womb, such as a problem with a joint or where two or more bones are fused together. This is known as tarsal coalition and results in the feet being flat and stiff. Flat feet that develop in later life can be caused by a condition that affects the joints, such as arthritis, or an injury to a muscle, tendon or joint in the foot. Conditions that affect the nervous system (brain and spinal cord) can also cause the arches to fall. Over time, the muscles gradually become stiffer and weaker and lose their flexibility. Conditions where this can occur include cerebral palsy, spina bifida and muscular dystrophy. Adult-acquired flat feet often affect women over 40 years of age. It often goes undiagnosed and develops when the tendon that supports the foot arch gradually stretches over time. It's not fully understood what causes the tendon to become stretched, but some experts believe that wearing high heels and standing or walking for long periods may play a part. Obesity, high blood pressure (hypertension) and diabetes are all risk factors. Recent research has found a link with changes to the tendon in the foot and an increase in a type of protein called proteolytic enzyme. These enzymes can break down some areas of the tendon, weakening it and causing the foot arch to fall. Similar changes are also seen in other conditions, such as Achilles tendonitis. This could have important implications for treating flat feet because medication that specifically targets these enzymes could provide an alternative to surgery. However, further research is needed and this type of treatment is thought to be about 10 to 15 years away.
The primary symptom of fallen arches is painful or achy feet in the area in which the foot arches or on the heel. This area may become swollen and painful to stand still on. This causes the patient to improperly balance on their feet which in turn will cause other biomechanical injuries such as back, leg and knee pain.
Many medical professionals can diagnose a flat foot by examining the patient standing or just looking at them. On going up onto tip toe the deformity will correct when this is a flexible flat foot in a child with lax joints. Such correction is not seen in the adult with a rigid flat foot. An easy and traditional home diagnosis is the "wet footprint" test, performed by wetting the feet in water and then standing on a smooth, level surface such as smooth concrete or thin cardboard or heavy paper. Usually, the more the sole of the foot that makes contact (leaves a footprint), the flatter the foot. In more extreme cases, known as a kinked flatfoot, the entire inner edge of the footprint may actually bulge outward, where in a normal to high arch this part of the sole of the foot does not make contact with the ground at all.
arch support for flat feet
Non Surgical Treatment
Most cases of fallen arches are not painful and need no form of treatment. However, common symptoms of fallen arches can include pain in your feet (particularly in the area of your heel or arch), pain in your feet that persists after long bouts of physical activity or standing up, achy feet, or arch pain when standing on the tips of your toes. Most cases of fallen arches are not preventable. Treatments for fallen arches include, rest, ice, compression, medication to relieve pain, orthotics, or in some cases surgery.
Surgical correction is dependent on the severity of symptoms and the stage of deformity. The goals of surgery are to create a more functional and stable foot. There are multiple procedures available to the surgeon and it may take several to correct a flatfoot deformity. Stage one deformities usually respond to conservative or non-surgical therapy such as anti-inflammatory medication, casting, functional orthotics or a foot ankle orthosis called a Richie Brace. If these modalities are unsuccessful surgery is warranted. Usually surgical treatment begins with removal of inflammatory tissue and repair of the posterior tibial tendon. A tendon transfer is performed if the posterior tibial muscle is weak or the tendon is badly damaged. The most commonly used tendon is the flexor digitorum longus tendon. This tendon flexes or moves the lesser toes downward. The flexor digitorum longus tendon is utilized due to its close proximity to the posterior tibial tendon and because there are minimal side effects with its loss. The remainder of the tendon is sutured to the flexor hallucis longus tendon that flexes the big toe so that little function is loss. Stage two deformities are less responsive to conservative therapies that can be effective in mild deformities. Bone procedures are necessary at this stage in order to recreate the arch and stabilize the foot. These procedures include isolated fusion procedures, bone grafts, and/or the repositioning of bones through cuts called osteotomies. The realigned bones are generally held in place with screws, pins, plates, or staples while the bone heals. A tendon transfer may or may not be utilized depending on the condition of the posterior tibial tendon. Stage three deformities are better treated with surgical correction, in healthy patients. Patients that are unable to tolerate surgery or the prolonged healing period are better served with either arch supports known as orthotics or bracing such as the Richie Brace. Surgical correction at this stage usually requires fusion procedures such as a triple or double arthrodesis. This involves fusing the two or three major bones in the back of the foot together with screws or pins. The most common joints fused together are the subtalar joint, talonavicular joint, and the calcaneocuboid joint. By fusing the bones together the surgeon is able to correct structural deformity and alleviate arthritic pain. Tendon transfer procedures are usually not beneficial at this stage. Stage four deformities are treated similarly but with the addition of fusing the ankle joint.
Patients may go home the day of surgery or they may require an overnight hospital stay. The leg will be placed in a splint or cast and should be kept elevated for the first two weeks. At that point, sutures are removed. A new cast or a removable boot is then placed. It is important that patients do not put any weight on the corrected foot for six to eight weeks following the operation. Patients may begin bearing weight at eight weeks and usually progress to full weightbearing by 10 to 12 weeks. For some patients, weightbearing requires additional time. After 12 weeks, patients commonly can transition to wearing a shoe. Inserts and ankle braces are often used. Physical therapy may be recommended. There are complications that relate to surgery in general. These include the risks associated with anesthesia, infection, damage to nerves and blood vessels, and bleeding or blood clots. Complications following flatfoot surgery may include wound breakdown or nonunion (incomplete healing of the bones). These complications often can be prevented with proper wound care and rehabilitation. Occasionally, patients may notice some discomfort due to prominent hardware. Removal of hardware can be done at a later time if this is an issue. The overall complication rates for flatfoot surgery are low.