Scapulohumeral osteoarthritis in 20 Shetland ponies, miniature horses and falabella ponies.

This research examines the symptoms, diagnosis, and possible causes of scapulohumeral osteoarthritis in 20 small horse breeds. Despite exploring various treatment options, none proved significantly beneficial, and the majority of the animals remained lame, requiring the occasional use of painkillers. Certain joint abnormalities possibly predispose these breeds to the affliction.

Objective and Methodology

• The purpose of this research was to thoroughly examine the clinical and diagnostic characteristics of 20 cases of scapulohumeral osteoarthritis (an affliction of the shoulder joint involving bone degeneration) in small horse breeds such as Shetland ponies, miniature horses, and falabella ponies.
• With each case, a detailed review of the history and clinical signs was carried out, while also conducting radiographic examinations to discern and compare the internal impacts of the condition on these animals.

Findings

• The history and clinical signs were found to be similar across all studidentified cases, signaling a correlation between this condition and the smaller horse breeds in question.
• Radiographically, consistent changes were detected in all the cases. The primary changes observed included the development of articular osteophytes (bone spurs in the joint) and periarticular enthesiophytes (bone spurs near the joint).
• In six of the cases, there was radiographic evidence suggesting dysplasia of the scapulohumeral joint (abnormal shape or size of the joint), though it remained unclear whether this dysplasia was an initial cause or a result of the disease’s progression.

Treatment and Prognosis

• No specific treatment was demonstrated to be advantageous. Pain management through occasional use of oral non-steroidal anti-inflammatory drugs was applied to manage the persistence of lameness in the horses.
• Ultimately, six of the subjects had to be euthanized due to severe and continuous lameness. The remaining 14 animals also continued to suffer from lameness but managed to survive on pastures with periodic doses of anti-inflammatory medication.

Possible Etiology

• Though no concrete cause was identified for the condition, the researchers proposed that an underlying dysplasia or deficiency of lateral support may predispose the small horse breeds’ scapulohumeral joint to this degenerative disease.