Kohlers disease is a problem if the growing navicular bone in the feet of children. It is due to an interruption of the blood supply to the bone. As the bone is at the top of the arch of the foot, it takes considerable load during walking so this disruption to the blood supply leads to a softening and deformity in the bone. The most common age of onset is around 5 years of age and it presents with pain over the top of the arch, sometimes with some swelling and it may lead to a limp.
What to do for it?
Don’t do anything, go to the doctor.