Posterior tibial tendon dysfunction is one of several terms to describe a painful, progressive flatfoot deformity in adults. Other terms include posterior tibial tendon insufficiency and adult acquired flatfoot. The term adult acquired flatfoot is more appropriate because it allows a broader recognition of causative factors, not only limited to the posterior tibial tendon, an event where the posterior tibial tendon looses strength and function. The adult acquired flatfoot is a progressive, symptomatic (painful) deformity resulting from gradual stretch (attenuation) of the tibialis posterior tendon as well as the ligaments that support the arch of the foot.
The arch of the foot is a very complex structure, consisting of multiple bones and ligaments. Most causes of arch pain are related to the anatomy of the arch and the types of physical activity that you perform. For example, a classic set up for arch pain is people who engage in lots of high impact exercise (such as running) while wearing a type of athletic shoe that does not properly support their type of foot arch.
The foot of a newborn with congenital vertical talus typically has a convex rocker-bottom shape. This is sometimes combined with an actual fold in the middle of the foot. The rare person who is diagnosed at an older age often has a “peg-leg” gait, poor balance and heavy calluses on the soles where the arch would normally be. If a child with congenital vertical talus has a genetic disorder, additional symptoms often are seen in other parts of the body.
The adult acquired flatfoot, secondary to posterior tibial tendon dysfunction, is diagnosed in a number of ways with no single test proven to be totally reliable. The most accurate diagnosis is made by a skilled clinician utilizing observation and hands on evaluation of the foot and ankle. Observation of the foot in a walking examination is most reliable. The affected foot appears more pronated and deformed compared to the unaffected foot. Muscle testing will show a strength deficit. An easy test to perform in the office is the single foot raise.
Non Surgical Treatment
Rest is the most important thing you can do. Stay off your feet, or use a cane. Gently apply ice to the arch for at least 30 minutes, and repeat every 3 or 4 hours. Apply mild compression to the foot. Use a Fabriform PSC Foot and Ankle Strap to help support the arch, reduce swelling, and relieve pain and fatigue. This strap is easy to apply and adjust for a custom fit. Low profile allows it to fit in any shoe. Allows you to apply just the right amount of arch support/compression for your foot. Before stepping down after sleeping or resting, stretch the arch of your foot by pulling up on the ball of the foot and toes, as far as you comfortably can; hold the foot in this position for ten seconds. Repeat at least ten times. Consideration should also be given to the use of night splints. These are very effective for stretching the plantar fascia to relieve first weight bearing pain.
Foot surgery is difficult, especially when large amounts of deformity correction are needed. The ability to bring the foot into a new position may not be lasting, even if everything looks perfect in the operating room. The goal is to provide improved position and function of the foot and ankle. In some patients with very severe deformity, the goal is a foot that functions well in a brace. 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. Particular complications associated with cavus foot surgery include incomplete correction of deformity, return of deformity and incomplete fusion.
To prevent arch pain, it is important to build up slowly to your exercise routine while wearing arch supports inside training shoes. By undertaking these simple measures you can prevent the discomfort of arch pain which can otherwise linger for many months. While you allow the foot to recover, it will help to undertake low impact exercises (such as swimming or water aerobics).
Ankle evert or strengthening. Lie on your side with your feet hanging off the end of your bed or a weight bench. Bend the toes of the foot that is closer to the ceiling slightly toward your head. This is the starting position. Now raise your toes toward the ceiling while keeping the rest of your leg stationary. Return to the starting position. Reps. 10-15. Now point your toes slightly away from your head. This is the starting position. Raise your toes toward the ceiling. Return to the starting position. Reps. 10-15. Ankle invertor strengthening. Same as above, but do the exercises with the foot that is closer to the floor. Dorsiflexor strengthening. Sit on a desk, table, or counter so that your feet don?t touch the ground. Let your feet dangle comfortably. Bend your foot upward as far as you can comfortably go. Do not let your foot pull inward or outward. Return to the starting position. Reps. 10-15.