What condition is DISH commonly associated with?   Diabetes increases your risk of having DISH.  Also certain medications can increase your risk, such as the retinoids.

What other orthotic could be used in knee OA?   A medial unloading brace to correct the varus deformity has been proved to help with symptoms of knee OA.

What hand joint is more commonly affected than the above mentioned one?   The 1st carpometacarpal joint is actually the most common in the hand.