Use of antimicrobial-impregnated polymethyl methacrylate beads for treatment of chronic, refractory septic arthritis and osteomyelitis of the digit in a bull.

A 6-year-old 895-kg Angus bull was evaluated for a 6-month history of left hind limb lameness that was refractory to antimicrobial treatment. On physical examination, there was soft-tissue swelling associated with the lateral digit. Radiography revealed septic arthritis of the distal interphalangeal joint and osteomyelitis of the distal and middle phalanges. Treatment included debridement and lavage. Bacteriologic culture of debrided tissues yielded aerobic and anaerobic organisms. Antimicrobials were administered parenterally and locally in the form of antimicrobial-impregnated polymethyl methacrylate beads. The limb also was placed in a cast to promote ankylosis. The bull recovered, and the digit was salvaged.