(1) Although bone spavin usually causes lameness, this may be obscured if the lesions are bilateral.(2) Bone spavin is arthritis between the little joints in the hocks, which don't have much movement anyways.(3) Among all the sports medicine problems faced by the horse, bone spavin is probably the most common.(4) Like osteoarthritis in people, the cause of spavin is not very well understood.(5) Bog spavins can be large and highly visible, and make horse-owners very nervous, but they're just lumps - not lamenesses.
