Osteomyelitis secondary to trauma involving the proximal end of the radius in horses: five cases (1987-2001).

This research paper investigates how injury-induced osteomyelitis, a type of bone infection, in horses affects the radius bone near the elbow, and the consequent treatment and outcomes. The study involved five horses whose medical history, usage, degree of lameness, and scan results were analyzed. Resultant data showed duration of lameness varied from 14 to 60 days. All horses displayed pain when their elbow joint was manipulated. Radiographic findings revealed the presence of abnormal bone growth and bone lysis. All horses were treated with long-term antimicrobials and one also had a localized treatment at the radial bone. All horses reportedly returned to their previous function post-treatment.

Methodology

• The researchers carried out a retrospective study on data collected from five horses’ medical records.
• The data included the horses’ signals (signs of disease or injury), history, use, degree of lameness, and the results of radiographic, ultrasonographic, and scintigraphic scans.

Findings

• The period of lameness before the horses were referred for treatment ranged from 14 to 60 days. On average, the horses displayed a lameness severity of grade 3 out of 5, with only one limb affected.
• All horses showed indicators of pain during manipulation of the elbow joint and digital palpation (applying pressure with fingers to assess the condition) over the lateral side of the upper end of the radius bone.
• The radiographic scans revealed abnormalities such as periosteal proliferation (increase in the diameter of the bone), osteolysis (destruction or disappearance of bone tissue), and subchondral lysis (bone degradation under the cartilage).
• Scintigraphy (an imaging test that uses radioactive material) performed on three horses showed a high rate of pharmaceutical uptake spread over the upper end of the radius bone.
• Two horses were afflicted with sepsis (a severe infection spreading through the bloodstream) of the elbow joint.

Treatment and Outcome

• All horses were subjected to a long-term course of antimicrobials.
• In addition, one horse was treated with local perfusion (method of delivering medication to a specific part of the body) of the radial medullary cavity (interior of the radius bone) through an indwelling (left in place for a period of time) cannulated screw.
• In terms of outcomes, all horses had returned to their previous activities at the time of follow-up.

Conclusions

• Based on the results, the researchers concluded that osteomyelitis of the upper end of the radius could be caused by a traumatic injury to the antebrachium (the part of the forelimb of a horse that includes the radius and ulna, between the elbow and the knee).
• They recommended a thorough examination of the wound area and elbow joint as the lesions detected could be an extension of septic arthritis.
• The researchers also noted that long-term systemic antibiotic treatment could lead to successful outcomes in such cases.