Over-pronation occurs when the foot collapses too far inward stressing the plantar fascia (the area underneath the arch of the foot.) Normally, one pronates every time he/she walks, but excessive pronation is called over-pronation. When this occurs it can cause pain in the feet, knees, hips, low back and even the shoulder.
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.
With over pronation, sufferers are most likely to experience pain through the arch of the foot. A lack of stability is also a common complaint. Over pronation also causes the foot to turn outward during movement at the ankle, causing sufferers to walk along the inner portion of the foot. This not only can deliver serious pain through the heel and ankle, but it can also be the cause of pain in the knees or lower back as well. This condition also causes the arch to sink which places stress on the bones, ligaments, and tendons throughout the foot. This may yield other common conditions of foot pain such as plantar fasciitis and heel spurs.
A quick way to see if you over-pronate is to look for these signs. While standing straight with bare feet on the floor, look so see if the inside of your arch or sole touches the floor. Take a look at your hiking or running shoes; look for wear on the inside of the sole. Wet your feet and walk on a surface that will show the foot mark. If you have a neutral foot you should see your heel connected to the ball of your foot by a mark roughly half of width of your sole. If you over-pronate you will see greater than half and up to the full width of your sole.
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.
Depending on the severity of your condition, your surgeon may recommend one or more treatment options. Ultimately, however, it's YOUR decision as to which makes the most sense to you. There are many resources available online and elsewhere for you to research the various options and make an informed decision.