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The dilatation of this articular synovial sac is what is denominated bog spavin, the term thoroughpin being applied to the dilatation of the tendinous capsule.

The thoroughpin is found at the back and on the top of the hock in that part known as the "hollows," immediately behind the shank bone.

Bog spavin is often present in case of thoroughpin but the two conditions are separate and distinct excepting in that both may occur simultaneously and as the result of the same cause.

Thus it seems that subjects of rather faulty conformation, animals having lymphatic temperaments and the coarse-bred types, are prone to synovial disturbances such as thoroughpin, bog spavin, etc., sometimes having both legs affected.

The terms "thoroughpin" or "throughpin" are translations from the French vessignon chevillé and have the same significance.