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"Going with us after all? I hope so, my boy." "No," said I, "I just wanted to say that that nigh mare was lame day before yesterday, and I I I didn't want you to start off with her without knowing it." Dunlap asked about her lameness, and got out to look her over. He felt of her muscles, and carefully scrutinized her for swelling or swinney or splint or spavin or thoroughpin.

Distension of the Tarsal Sheath of the Deep Digital Flexor. The terms "thoroughpin" or "throughpin" are translations from the French vessignon chevillé and have the same significance. They are so named because of the diametrically opposed distensions of the sheath of the deep flexor tendon in such manner that the distensions appear to be due to a supporting peg. Anatomy.

During the acute inflammatory stage there is marked lameness present but this soon subsides when local antiphlogistic agents are applied to the parts. In fact, spontaneous relief from lameness usually results in the course of ten days' time following the appearance of thoroughpin.

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. Symptomatology. Thoroughpin is characterized by a distended condition of the tarsal sheath which is manifested by protrusions anterior to the tendo Achillis.

As a result of acute synovitis a chronic synovial distension of the tarsal sheath occurs. 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. Some animals are undoubtedly predisposed to disease of synovial structures.