Luxation (dislocation) of the superficial flexor tendon
The superficial flexor tendon is held onto the point of the hock by strong ligament-like attachments. Luxation (dislocation) of the tendon occurs when one of the attachments ruptures. This usually occurs due to trauma.
Signs
The animal will show a very sudden severe lameness with swelling at the point of the hock. Once this initial period is over the tendon can be seen occasionally slipping off the hock, each time causing distress to the animal. Eventually the tendon adapts a new position to the side of the point of the hock which can be easily seen.
Treatment
The condition is initially treated with rest and anti-inflammatory drugs such as phenylbutazone (‘bute’) and bandaging of the limb. After this period surgical treatment can be attempted or the animal simply kept on box rest until the tendon settles in a new position. Most horses usually require at least a year off work and not all of them become sound.