As with the “normal pronation” sequence, the outside of the heel makes the initial ground contact. However, the foot rolls inward more than the ideal fifteen percent, which is called “overpronation.” This means the foot and ankle have problems stabilizing the body, and shock isn’t absorbed as efficiently. At the end of the gait cycle, the front of the foot pushes off the ground using mainly the big toe and second toe, which then must do all the work.
There is a relationship between biomechanics and injury that is specific to each body part. Overall though, poor mechanics will either increase the landing forces acting on the body or increase the work to be done by the muscles. Both increase the stress, which, depending on the individual and the amount of running can become excessive and cause injury.
Common conditions seen with overpronation include heel pain or plantar fasciitis, achilles tendonopathy, hallus valgus and or bunions, patellofemoral pain syndrome, Iliotibial band pain syndrome, low back pain, shin splints, stress fractures in the foot or lower leg.
The best way to discover whether you have a normal gait, or if you overpronate, is to visit a specialty run shop, an exercise physiologist, a podiatrist or a physical therapist who specializes in working with athletes. A professional can analyze your gait, by watching you either walk or run, preferably on a treadmill. Some facilities can videotape your gait, then analyze the movement of your feet in slow-motion. Another (and less costly) way is to look at the bottom of an older pair of run shoes. Check the wear pattern. A person with a normal gait will generally see wear evenly across the heel and front of the shoe. A person who overpronates will likely see more wear on the OUTside of the heel and more wear on the INside of the forefoot (at the ball). A person who supinates will see wear all along the outer edges of the shoe. You can also learn about your gait by looking at your arches. Look at the shape your wet feet leave on a piece of paper or a flat walking surface.
Non Surgical Treatment
The way a foot orthotic works is by altering the weight-bearing surface of the foot. The simulated foot improvement is only possible when standing still with full weight applied. Orthotics are of little help through most of the actual walking cycle. observationPatients may experience some symptom relief, but the orthotic cannot correct the internal osseous misalignment. Over-the-counter foot orthotics are usually of little help and wear out quickly. Custom-made foot orthotics, obtained through your doctor’s office, are generally expensive. Though they last longer and have less chance of ill-effects than OTC brands, they still need to be replaced often. Over a lifetime, an individual can spend several thousands of dollars in total costs associated with orthotics and see little or no results. This is because orthotics only work when you are wearing them and do not treat the cause of the problem. In many cases, the external pressure points created by orthotics can cause more problems than solutions. Blisters, sore feet, sore joints and many other long-term complications can arise as a consequence of wearing orthotics.
Subtalar Arthroereisis. Primary benefit is that yje surgery is minimally invasive and fully reversible. the primary risk is a high chance of device displacement, generally not tolerated in adults.
An implant is pushed into the foot to block the excessive motion of the ankle bone. Generally only used in pediatric patients and in combination with other procedures, such as tendon lengthening. Reported removal rates vary from 38% – 100%, depending on manufacturer.