Arthrectomy for traumatic proximal interphalangeal arthritis in the lateral digit in a heifer

Abstract

Instructive information on the treatment for chronic deep infections of digital joints in a 9-month-old Holstein heifer is described in this report. Preoperative ultrasonographic and radiographic examinations revealed soft tissue swelling and subchondral bone lysis at the distal part of the proximal phalanx in the lateral digit. Arthrectomy was performed under xylazine sedation to remove infectious articular cartilage tissues. Immature callus formation was observed via radiography at the surgical site by the 28th postoperative day. On the 48 th postoperative day, callus fell into disrepair on the radiographs along with aggravation of the locomotion score. After the application of a half-limb cast, the immature callus formed again by the 62nd postoperative day (11 months), and bony callus formation was observed by the 74th postoperative day. Thereafter, the heifer could walk well with marked improvement in the locomotion score. The withers height of the heifer at 15 months (137 cm) was within the range of that in other heifers of the same age on this farm (136 ± 5 cm); however, the body weight (BW) of this heifer (382 kg) was lower than the BW of others (443 ± 30 kg). The BW gain from 11 to 15 months of age seemed to be higher in the present heifer (+136 kg) than in others (+109 ± 8 kg), suggesting that BW of the present heifer was returning to the original BW. Based on these observations, we suggested that arthrectomy was an effective treatment option for the present case of digital joint arthritis.