The subluxed cuboid is very frequently a missed diagnosis. It can also be difficult to treat. Treatments can vary from manipulation, taping the side of the foot to hold the cuboid in place works sometimes, ultrasound therapy, anti-inflammatory medicine, muscle relaxers, injections of cortisone, orthotics, even immobilization in a cast brace.
Sometimes, I will refer a particularly difficult case to a chiropractor. I will usually check if they even know what I am talking about- some of them specialize in other areas.
You might also need to get some further tests such as a bone scan or MRI to rule out a fracture.
Vivian Abrams DPM