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Objective— To determine if intra‐articular anesthesia of the distal interphalangeal joint could alleviate lameness associated with the navicular bursa in horses.

Study Design— Experimental investigation.

Animals— Six clinically normal horses.

Methods— Lameness was induced in each horse by injecting either the left or right front navicular bursa with 5 mg of amphotericin‐B. Forty‐eight hours later each horse was videotaped walking and trotting before, and 5, 30, and 60 minutes after injecting the distal interphalangeal joint of the treated limb with 5 mL of 2% mepivacaine hydrochloride. All video recordings were then rerecorded onto master tapes in a random sequence. Four clinicians, unaware of the animal identity related to observation time or limb treated, independently viewed these tapes and graded the lamenesses.

Results— There was a significant reduction in lameness 5 and 30 minutes after anesthetic …