You may feel that overpronation is equivalent to a death sentence for athletes when you browse some of the running websites and social media comments. One might believe it can result in the many overuse injuries which runners get and precisely why they require the special motion control athletic shoes or foot supports to correct it. This does get discussed in some groups that it is something that is evil and that it should be managed.
Pronation is a normal motion of the foot where the ankle rolls inwards and also the arch of the foot flattens. Overpronation occurs when there may be too much of this natural motion. There is no clear definition of precisely what overpronation really is and what may be perceived as normal and abnormal. This issue is alleged to cause an inefficient running gait, so extra energy is required to run. It is also claimed that a foot that overpronates might cause all sorts of issues from hallux valgus to heel pain to leg injuries. For that reason athletes that do overpronate are generally strongly encouraged to use foot orthoses to support the foot and make use of the motion controlling running shoes.
Despite this, there are plenty of stories of runners who do have a significant severe form of overpronation whom never ever have conditions and may run easily. It has ended in comments that the entire theory about overpronation can be a misconception and is not really a problem. They're saying it is made up by those who earn money from foot supports and also running footwear.
However, if you look at the actual research evidence, then yes, overpronation (however you wish to define it) is a problem in runners. The published meta-analyses and systematic reviews of all of the research reveal that this is usually a small risk factor for overuse injury in athletes, but that risk is still statistically important. Which means that overpronation is a problem is athletes however its most likely not as big a problem it has been viewed as in earlier times.