Kohlers Disease
This is an uncommon problem of the tarsal navicular bone, but I have seen 3 in the last 2 weeks! They were all in 5-6 year old boys. They all caused the child to limp and all were really poor at telling me where it hurts, which is pretty typical for this age. Once the pain was located to the bone, it was clear what this probably was and the x-rays confirmed it. In each case the navicular on the affected side was ‘squashed’ compared to the other foot (see these x-rays). I put all 3 into walking braces to protect the foot. Will report back how they did.