James Law, Text book of veterinary medicine… (1902)
“ The lesions are mainly concentrated in the stifle, hock, knee and fetlock. In some cases the dorsal and lumbar muscles suffer and there is arching of the back with great tenderness on manipulation. In other cases the muscles of the quarter or shoulder are involved as shown by their stiffness and extreme sensibility to touch.546The pig is found down, indisposed to rise, and when up, stands drawn together with limbs rigid and feet resting on the toes. He will often point one toe to the ground repeatedly, before resting on the foot, or shift the weight uneasily from foot to foot. ”
