Normally, when you walk or run, your heel is the first part of your foot to strike the ground. As your body weight shifts to the middle of the foot, the arch of the foot naturally flattens out a bit. This flattening is called pronation. If your feet flatten more than normal, it?s called over-pronation or flat feet. Over-pronation can cause many problems, such as an Achilles tendon injury or heel pain. It may lead to knee problems.
Pronation can occur as an overuse syndrome in active runners, where a great deal of stress is placed on ligaments and tendons that support the medial column. Obesity is another predictor for pronation and deterioration of the medial ligaments and posterior tibial tendon due to excessive stress on these tissues. Acute Trauma can also lead to over-pronation when ligaments are torn or tendon is ruptured. Once again this can lead to a collapse of the medial column. Arthritic conditions involving the knee joint when the joint is in varus (inner collapse) posture, this places the center of gravity over the ankle joint rather than the foot causing undue pressure on the inner ankle.
Overpronation may have secondary effects on the lower legs, such as increased rotation of the tibia, which may result in lower leg or knee problems. Overpronation is usually associated with many overuse injuries in running including medial tibial stress syndrome, or shin splints, and knee pain Individuals with injuries typically have pronation movement that is about two to four degrees greater than that of those with no injuries. Between 40% and 50% of runners who overpronate do not have overuse injuries. This suggests that although pronation may have an effect on certain injuries, it is not the only factor influencing their development.
Pronounced wear on the instep side of shoe heels can indicate overpronation, however it's best to get an accurate assessment. Footbalance retailers offer a free foot analysis to check for overpronation and help you learn more about your feet.
Non Surgical Treatment
The following exercises help retrain the foot and ankle complex to correct overpronation. Exercises may be performed while wearing shoes, or for an even greater challenge, in bare feet. Duck Stand. This exercise is designed to prepare for the more dynamic BT exercises ahead by waking up the gluteal muscles and teaching clients how the gluteal muscles control the degree of foot pronation. For example, when the glutes contract concentrically, they rotate the leg outward. As the leg rotates outward, the arch of the foot raises (i.e., supinates). Stand beside the BT with both heels together and feet turned outward. (Note: As you progress, perform this exercise while standing on the BT.) Try to rotate legs outward by tightening buttock muscles while tilting pelvis under. As legs rotate outward, arches of the feet raise up out of pronation. Hold position for 30 seconds. Big Toe Pushdowns. This exercise is designed to strengthen the muscle of the big toe that holds up the arch of the foot (i.e., flexor hallucis longus muscle). This stops the foot from overpronating. Stand on top of the BT dome with feet facing forward. Use gluteal muscles to raise the arches of the feet (see previous exercise - "Duck Stand"). Keep arches raised while pushing down big toe into the BT. While pushing down, tension build in the arch on the underside of their foot should be felt. Hold position for 15 seconds.
Calcaneal "Slide" (Sliding Calcaneal Osteotomy) A wedge is cut into the heel bone (calcaneus) and a fixation device (screws, plate) is used to hold the bone in its new position. This is an aggressive option with a prolonged period of non-weightbearing, long recovery times and many potential complications. However, it can and has provided for successful patient outcomes.