A splint is a rigid or semi-rigid support applied externally to a limb to restrict movement, reduce pain, and protect damaged tissue while it heals. In equine medicine, splints are used after fractures of the lower leg, post-surgical stabilization, or when a soft-tissue injury requiring immobilization or ligament injury requires immobilization. Unlike a cast, a splint does not fully encircle the limb, which allows for swelling without creating a pressure injury.
Splinting materials range from traditional wooden or metal stays wrapped in bandaging to modern fiberglass and thermoplastic materials that can be molded to the contour of the bony splint calcification site and surrounding structures. Correct padding underneath the splint is critical: inadequate padding leads to pressure sores, while excessive padding can allow the limb to shift inside the device and defeat the purpose of immobilization.
In the context of equine bony “splints” (an unrelated but common usage), the term also describes a calcified growth on the interosseous ligament between the cannon bone and the splint bones of the lower leg. This calcification is not a device but a pathological change, though the same word is applied in barn usage. Both senses appear in veterinary literature, so context determines meaning. Proper diagnosis, whether the injury requires a physical splint or involves a bony splint lesion, requires veterinary assessment and often radiographs of the hoof and lower limb.
Recovery under a splint varies with the severity of the underlying injury. Horses with lower-limb fractures stabilized by splinting before transport to a referral hospital have significantly better surgical outcomes than those moved without support. After removal, gradual reintroduction to weight-bearing and monitoring for acute pain episodes guides the rehabilitation timeline.