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[Term] Broken-back foot-pastern axis Descriptive (clinical) [Definition] 
The angle that the dorsal hoof wall makes with the ground is lower than the angle the dorsum of the pastern makes with the ground. This angle can be measured using radiographs but it is difficult to measure accurately because it changes with positioning and weightbearing.
Equine Therapeutic Farriery | Dr. Stephen O'Grady, veterinarians, farriers, books, articles
Definition