i'm no dr so i want u 2 know that b4 i tell u anything.. many years ago i started having foot pain..drs thought maybe a foot spur.. but it wasn't. only many, and i mean many years later i learned it wasn't my foot, but my lower back.. a m.r.i. would show it.. i pray ur dad finds out soon and get his foot 2 stop hurting. also my father -n-law had problems with his foot . his foot would drag and sometimes he would fall. it wasn't his foot tho that was the problem, but his neck.. he had 2 neck surgeries, but neither surgery helped. Gbu