A case of bilateral hip dysplasia in a foal.

The research article describes a case study of a rare condition known as bilateral hip dysplasia in a young foal. The foal, aged 14 weeks, had been experiencing lameness for a significant duration, and its condition was unrelated to typical causes such as fractures or traumatic dislocation. The study discusses the diagnosis, including symptoms and radiographic findings, and provides a detailed examination of the affected joints.

Overview of Hip Dysplasia

• Hip dysplasia is a degenerative condition that affects the hip joint, leading to lameness, erosion of the joint cartilages, and other symptoms. Usually, it is associated with certain horse breeds like the Norwegian Dole horse and is thought to be inherited.
• Though there have been a few reported cases of unilateral (affecting one side) degenerative arthritis and subluxation in young horses, this case study reports a rare occurrence of bilateral (affecting both sides) hip dysplasia.

Case Description

• The subject was a 14-week-old Andalusian-Arab cross filly foal that had been experiencing lameness in the right hind leg. The lameness had moderate onset with no indicators of septic arthritis or trauma, and the foal was otherwise in good health.
• The initial clinical indicators were hind limb abnormalities such as bilateral gluteal muscle atrophy and shortened stride phases, more noticeable on the right hind leg. There was no pain response detected upon palpation or manipulation of the hind legs.
• Despite a normal haemogram result, the symptoms indicated a chronic, non-infectious process involving the coxofemoral joints.

Radiographic Findings

• Radiographs of the foal’s hip joints revealed severe abnormalities. Both femoral heads (the ball-shaped part of the hip joint) were luxated (dislocated), appearing both laterally (to the side) and caudally (to the back).
• The outlines of the femoral heads were also abnormal – they were flattened and exhibited a rough texture, indicative of a significant degenerative condition.

The research concludes with the unique presentation of bilateral hip dysplia in a foal, providing valuable insight mainly because hip ailments are generally linked to trauma or fractures. Further information about the sire’s offspring could provide more insight into the genetic predisposition of this condition and the likelihood of its occurrence in future generations.