WAS: Adequan and the IR horse NOW: Subclinical laminitis
Members here have experienced that arthritis is often diagnosed incorrectly in many cases. The foot symptoms you describe are often due to subclinical laminitis. Would recommend a close review of DDT+E for your guy just to be sure.
Here are a couple of posts
Nancy C in NH
ECIRHorse.com - your reference source
for Insulin Resistance and Cushing's Disease
NOLaminitis.org - see you at the next ECIR Group No Laminitis! Conference
--- In EquineCushings@..., "Robin Lake" <lake22802@...> No laminitic episodes in this guy but is now back in shoes due to flat soles/tenderness when ridden.