Equine laminitis caused by distal displacement of the distal phalanx: 12 cases (1976-1985).

This study reviews 12 cases of equine laminitis, a serious foot disease in horses, characterized by a displacement in one part of the foot bone (the distal phalanx). The study compares clinical features between horses who survived and those who didn’t to identify potential indicators for prognosis. An interesting finding was that the survivors weighed less than the non-survivors, suggesting body weight could be a key predictive factor.

Subject and Symptoms

• The study revolves around 12 cases of equine laminitis, a painful and potentially crippling disease that affects the horse’s foot. It particularly focuses on cases where the distal phalanx, one component of the foot bone, is displaced.
• The research also attempts to identify prognostic indicators by comparing clinical features of horses that survived the syndrome with those that did not.
• The subjects include a variety of breeds: 8 Quarter Horses, 2 Welsh ponies, 1 Thoroughbred, and 1 Arabian, with a majority being females.
• Significant symptoms included evidence of endotoxemia and/or sepsis, depression or cavitation of the dorsal coronary band, and fluid oozing from the coronary bands. Some affected horses also sloughed off one or more of their hooves.

Findings

• A core finding in this study was the potential influence of body weight on prognosis. The mean body weight of the animals was 442 kg, but interestingly, survivors weighed less (384 kg) than non-survivors (473 kg), indicating that body weight may be a crucial factor in weathering the disease.
• Another key finding was the identification of the dorsal coronary band cavitation as a reliable clinical indicator of distal displacement of the distal phalanx. All affected horses displayed this symptom.
• The condition was often associated with other disorders – 83% of the animals were initially admitted because of a different health issue, and developed laminitis only during the treatment period.
• Sadly, 8 horses had to be euthanized. Necropsy findings in these horses showed severe hemorrhagic, congested laminae and total detachment of the distal phalanx from the hoof wall, along with vascular thrombosis and multifocal areas of hemorrhage and necrosis in the laminae.
• In terms of diagnosis method, radiography did not always successfully reveal the displacement of the distal phalanx. In 8 of the cases, radiography failed, but in the remaining 4, it successfully indicated the problem through an accentuation of the dorsal proximal hoof wall and coronary band cavitation visible on lateral radiographs.