USET key terms

The sling of the third metacarpal or metatarsal bone formed by the suspensory ligament and its two branches, the proximal sesamoid bones, and the distal sesamoidean ligaments. It supports the fetlock and stores elastic energy during weight-bearing.

A linked system of muscles and tendons in the hindlimb in which the stifle and hock flex and extend together. The peroneus tertius and superficial digital flexor muscle coordinate these coupled joints, so movement at one joint mechanically drives the other.

A network of ligaments, tendons, and muscle tone that lets a standing horse lock its limbs with minimal muscular effort. It supports the forelimb and hindlimb during rest and sleep, reducing fatigue and energy expenditure.

Two small bones at the palmar or plantar aspect of the fetlock joint. They act as pulleys for the flexor tendons and are part of the suspensory apparatus. Fractures here are common in racehorses.

Sensitive and insensitive interlocking folds inside the hoof that suspend the distal phalanx within the hoof capsule. Their failure causes laminitis and rotation or sinking of the coffin bone.

The coffin bone, the terminal bone of the digit. It sits inside the hoof capsule, anchors the deep digital flexor tendon, and transmits load to the sole and wall. Its position changes in laminitis.

The order in which the four hooves strike the ground during a stride. It distinguishes walk, trot, canter, and gallop and is fundamental to gait identification.

One complete cycle of limb movement, from the first ground contact of one hoof to the next contact of the same hoof. A stride contains two steps, one for each fore and hind pair.

The portion of a stride when a hoof is on the ground bearing weight. Its duration relative to swing phase affects loading and stress on tendons and joints.

The portion of a stride when a limb is off the ground moving forward. Limb clearance, joint flexion, and protraction during swing affect injury risk and gait quality.

A period in canter and gallop when all four hooves are off the ground. Its presence and duration help distinguish these gaits from the walk and trot.

The normal downward rotation of the fetlock joint during weight-bearing. Excessive or reduced hyperextension can indicate lameness, tendon injury, or altered limb loading.

A catalog of a species' behaviors with objective descriptions used in systematic observation. It lets observers record behavior consistently and forms the basis of welfare assessment and behavior studies.

A repetitive, invariant behavior with no obvious function, such as crib-biting or weaving. It often develops in horses kept in restricted environments and is a welfare indicator.

The species-typical requirements for normal function and welfare, including foraging, social contact, movement, and rest. Housing and management that prevent these needs lead to stress and abnormal behavior.

The level of a stimulus at which a horse shows a fear reaction. It varies with temperament, experience, and arousal, so handlers adjust approach and pressure to stay below it.

The personal space around a horse that, when entered, causes it to move away. Handlers use its edge to drive horses calmly without triggering panic.

Sugars, starches, and fructans in feed that are digested to glucose and can raise blood insulin. Restricting them is central to managing laminitis and insulin dysregulation.

A standardized visual and palpable rating of fat cover over the neck, ribs, and tailhead, usually on a 1-to-9 scale. It guides feeding and monitors obesity risk and welfare.

Progressive exercise that improves cardiovascular fitness, muscle strength, and tendon resilience. Programs increase workload gradually to reduce injury risk and improve performance.

The level of work a horse can perform before fatigue, breathlessness, or lameness appears. It is assessed during conditioning and rehabilitation to set safe workloads.

A standardized score, commonly on the 0-to-5 American Association of Equine Practitioners scale, describing the severity of a gait deficit at walk, trot, or after flexion. It supports consistent communication and monitoring.

A diagnostic procedure in which a limb joint is held in flexion for a set time and the horse is trotted afterward. Worsening lameness suggests pain in the flexed region, though results are not specific.

Inflammation and failure of the lamellar attachments inside the hoof, allowing the distal phalanx to rotate or sink. It causes severe pain and is a major cause of chronic lameness.

A non-invasive imaging technique using high-frequency sound to assess soft tissues such as tendons and ligaments. It guides injury diagnosis and rehabilitation progress in equine practice.

The phased repair of injured tendon, from inflammation through repair to remodeling. Loading is controlled during rehabilitation because scar tissue is weaker and less elastic than normal tendon.

A rehabilitation approach that increases controlled loading in planned stages. It promotes tissue adaptation while avoiding re-injury, and is adjusted according to response and assessment findings.

A manual therapy technique applying controlled passive movement to a joint to restore motion and reduce pain. It is used within a plan and requires appropriate training and veterinary agreement.

Hands-on techniques such as massage, stretching, and joint mobilization used to improve soft tissue function and comfort. It complements, but does not replace, veterinary diagnosis and treatment.

The therapeutic application of cold, such as ice or cold-water therapy, to reduce pain, swelling, and tissue temperature after exercise or injury. Timing and duration follow a plan.

The initial measurement of a horse's condition, gait, and function before treatment begins. It provides the reference against which progress and outcomes are compared.

A written schedule of goals, interventions, frequency, and review points for a patient. It is based on assessment findings, agreed with the veterinarian and owner, and updated as the horse responds.

A defined, repeatable way to judge whether treatment is helping, such as a lameness score or range-of-motion measurement. It makes progress objective and supports clear documentation.

Permission given by an owner or agent after receiving clear information about proposed procedures, risks, benefits, and alternatives. It is documented before treatment begins.

The legal and professional limits of what a practitioner is trained and permitted to do. Working outside them, such as diagnosing or prescribing without authorization, is unsafe and unethical.

Directing a client to a veterinarian when findings suggest disease, injury, or a condition beyond the practitioner's role. Prompt referral protects the horse and respects professional boundaries.

A handling principle in which light pressure is applied to ask for a movement and released the moment the horse responds. Correct timing teaches calm compliance and reduces conflict behavior.