In captivity I have seen some bucks, having damaged an antler in velvet, carry that as "memory" in future antlers, and Ive also seen other examples where it gradually goes away and rights itself after a couple years. Oddly, Ive seen hard antler damage do this too. George and Anthony Bubenik from Geulph University have done alot of studying with unilateral and bilateral atrophy and other neat antler deformities.