Other Names
Gait abnormality, unsoundness. Lameness is a symptom rather than a disease in itself, but it represents the single most common reason horses are presented to vets in the UK and worldwide.
What is Equine Lameness?
Lameness is any abnormality of gait caused by pain, mechanical restriction, or neurological deficit affecting one or more limbs. It is not a diagnosis — it is a presenting sign that requires thorough veterinary investigation to identify the underlying cause. The causes of equine lameness are extraordinarily varied, ranging from a simple stone bruise to complex degenerative joint disease, tendon injury, foot imbalance, or neurological disease.
Lameness is the most economically significant health problem in the equine industry. Studies consistently report that the majority of performance horse wastage — horses retired, sold, or unable to compete — is attributable to musculoskeletal disease causing lameness. In racehorses, laminitis and tendon injuries dominate; in sport horses, joint disease and foot problems account for the largest proportion of cases.
The foot is involved in approximately 80–90% of forelimb lameness cases in horses, making foot-related disease — particularly navicular disease, laminitis, sole bruising, and foot imbalance — the most common causes of lameness that practitioners encounter. Hind limb lameness often has a different distribution, with hock and stifle disease being particularly common.
What Causes Equine Lameness?
The causes of lameness are too numerous to list exhaustively, but the major categories include:
Foot problems:
- Laminitis — inflammation of the sensitive laminae within the hoof capsule
- Navicular disease (palmar foot pain) — degenerative changes affecting the navicular bone and surrounding structures
- Sole bruising and puncture wounds
- White line disease and foot abscesses
- Hoof capsule distortion from poor trimming or shoeing
- Pedal osteitis — inflammation of the pedal bone (coffin bone)
Joint disease:
- Osteoarthritis (degenerative joint disease) — the most common joint disease in horses, particularly affecting the distal joints of the limb
- Septic arthritis (joint infections) — a surgical emergency
- Osteochondrosis (OCD) — developmental cartilage defects, particularly in young horses
- Synovitis and capsulitis — joint lining inflammation
Soft tissue injuries:
- Tendon injuries — suspensory ligament desmitis and superficial digital flexor tendon (SDFT) tendinitis are particularly common in competition horses
- Ligament sprains and tears
- Muscle injuries (tying-up, exertional rhabdomyolysis)
- Bursitis — inflammation of fluid-filled sacs (e.g. capped elbow, capped hock)
Bone disease:
- Stress fractures — common in racehorses and event horses
- Complete fractures — may be catastrophic or amenable to surgical repair depending on location
- Spavin (bone spavin) — osteoarthritis of the distal hock joints
Neurological causes:
- Equine protozoal myeloencephalitis (EPM)
- Equine herpesvirus myeloencephalopathy
- Wobbler syndrome (cervical vertebral stenotic myelopathy)
Symptoms and Signs
Lameness ranges from subtle to severe. Vets grade lameness on a scale of 0–5 (the American Association of Equine Practitioners grading system is widely used):
- Grade 0: No lameness detectable
- Grade 1: Inconsistent lameness, difficult to observe; not consistently apparent under any circumstances
- Grade 2: Consistent lameness under specific conditions (hard surface, circling, flexion)
- Grade 3: Consistently observable at trot on a straight line
- Grade 4: Obvious lameness at walk
- Grade 5: Non-weight-bearing or minimal weight-bearing lameness
Observable signs vary by affected limb and cause:
Forelimb lameness signs: The horse “nods” its head downward when the sound limb lands and raises its head when the lame limb bears weight (“head nods down on the sound side”). The lame limb shows a shortened cranial phase (reduced forward swing).
Hindlimb lameness signs: The pelvis drops on the sound side (“hip hike”). The lame hind limb may show reduced engagement, poor push-off, or dragging of the toe.
Other signs of musculoskeletal pain:
- Reluctance or refusal to perform certain movements (jumping, lateral work, collected paces)
- Behavioural changes — nappiness, poor performance, tension, or resistance
- Muscle wasting over the hindquarters, topline, or affected limb
- Heat, swelling, or pain on palpation of specific structures
- Shortened stride length or altered footfall pattern
- Stiffness after rest that improves (or worsens) with exercise
Diagnosis
Lameness investigation is a systematic process. Your vet will typically follow a structured examination protocol:
History and observation: When did lameness start? Under what conditions? Does it improve or worsen with work? Any recent changes in work, farriery, or management?
Static examination: Conformation assessment, limb palpation for heat, swelling, or pain, hoof tester application to identify painful areas, and assessment of foot balance.
Dynamic examination: Observation at walk and trot on hard and soft surfaces, on straight lines and circles, on both reins. Flexion tests — holding a joint in flexion for 60–90 seconds then trotting straight — can localise lameness to a region. Ridden assessment may reveal lameness not apparent in-hand.
Diagnostic nerve and joint blocks: Local anaesthetic is injected to numb specific regions (perineural blocks) or joints (intra-articular blocks). When lameness improves after a block, the source of pain is identified as being within the blocked region. This is the most powerful tool for accurate lameness localisation.
Imaging: Once the region is localised, imaging confirms the diagnosis:
- Radiography (X-ray) — bone and joint disease, fractures, laminitis
- Ultrasonography — tendon, ligament, and soft tissue injuries
- MRI — the gold standard for foot pain; reveals lesions in soft tissues and bone not visible on X-ray
- Scintigraphy (bone scan) — identifies areas of increased bone activity throughout the skeleton; useful for diffuse or poorly localised lameness
- CT (computed tomography) — fractures, complex bone lesions
See also our entries on equine hoof cracks and equine saddle sores for related conditions affecting working horses.
Treatment
Treatment depends entirely on the underlying cause and varies enormously. Broad categories include:
Rest and controlled exercise: Appropriate rest is fundamental to most musculoskeletal injury recovery. The duration and type of rest depends on the injury — tendon injuries may require 6–18 months; joint disease may be managed with modified work rather than total rest.
Anti-inflammatory medication: NSAIDs (phenylbutazone, flunixin, meloxicam) reduce pain and inflammation. Topical NSAIDs (e.g. diclofenac gel) are used for superficial joint conditions. Long-term NSAID use requires monitoring for gastric and renal side effects.
Farriery: Corrective trimming and shoeing is central to managing foot-related lameness. Remedial shoes (e.g. egg-bar shoes, wedge pads, heart-bar shoes) can significantly reduce pain and support the foot during recovery. Regular collaboration between vet and farrier is essential.
Intra-articular injections: Corticosteroids (often combined with hyaluronic acid) injected directly into affected joints reduce inflammation and provide significant pain relief. These are commonly used in the management of osteoarthritis of the hocks, coffin joint, and stifle.
Regenerative therapies: Platelet-rich plasma (PRP), interleukin receptor antagonist protein (IRAP), stem cell therapy, and autologous conditioned serum are increasingly used for tendon and ligament injuries and joint disease. Evidence for efficacy is growing.
Surgery: Required for specific conditions including fracture repair, joint fusions (e.g. distal tarsal joints in spavin), removal of OCD fragments, tendon splitting, or annular ligament desmotomy.
Physiotherapy and rehabilitation: Hydrotherapy, controlled exercise programmes, and physiotherapy are important components of rehabilitation, particularly for tendon and ligament injuries.
Prevention
- Work closely with a good farrier — regular, balanced trimming and shoeing at appropriate intervals (typically every 6–8 weeks) is the single most important preventive measure for foot-related lameness
- Manage work load appropriately — incremental fitness building, adequate warm-up and cool-down, and rest days reduce overuse injuries
- Maintain correct body weight — obesity is a major risk factor for laminitis and increases joint loading
- Ensure horses work on appropriate surfaces — consistent, well-maintained going reduces concussive and traumatic injuries
- Monitor pasture quality and restrict grazing of laminitis-prone horses during spring grass growth
- Ensure balanced nutrition — correct vitamin and mineral supplementation supports musculoskeletal health
- Learn to observe your horse’s movement critically — early identification of subtle gait changes enables earlier intervention
When to Call the Vet
- Non-weight-bearing lameness at any pace — always an emergency
- Sudden severe lameness following exercise or a fall
- Any suspected fracture or penetrating wound to the foot or joint
- Lameness accompanied by significant heat, swelling, or discharge
- Persistent lameness lasting more than 24–48 hours despite rest
- Subtle recurring lameness that does not resolve with a few days of rest
- Progressive deterioration in performance or behavioural changes that suggest musculoskeletal pain
Prognosis
Prognosis depends entirely on the cause, severity, and duration of the condition before treatment. Simple foot abscesses carry an excellent prognosis; stress fractures in racehorses carry a good prognosis with appropriate management; catastrophic long-bone fractures in the field may be untreatable. Degenerative joint disease can often be managed effectively to maintain performance horses in work, though complete resolution is not possible.
Early investigation of lameness consistently improves outcomes. Horses that are investigated promptly and treated appropriately return to work sooner and with better long-term soundness than those where lameness is ignored or managed symptomatically without identifying the cause.
Frequently Asked Questions
Should I ride a lame horse?
No. If your horse is visibly lame, do not ride. Exercising a lame horse causes further pain, potentially worsens the underlying injury, and delays recovery. Rest the horse, assess whether the lameness is improving with rest over 24–48 hours, and call your vet if it does not resolve or is severe from the outset.
What is the most common cause of forelimb lameness in horses?
Foot-related problems account for approximately 80–90% of forelimb lameness in horses. Navicular disease (palmar foot pain syndrome), laminitis, foot abscesses, sole bruising, and foot imbalance from inappropriate shoeing or trimming are the most frequently encountered causes. This is why any thorough lameness investigation starts with a careful examination of the foot.
How long does lameness investigation take?
A straightforward lameness investigation — history, static and dynamic examination, regional nerve blocks, and radiography — can be completed in 1–2 hours in the field. More complex cases requiring MRI, bone scanning, or referral to a specialist centre will take longer. The investigation time is almost always worth it: treating the correct diagnosis is far more effective than guessing.
Can poor saddle fit cause lameness?
Yes, though saddle-related lameness is often subtle and may present as poor performance, resistance, back pain, or reluctance rather than overt gait asymmetry. A poorly fitting saddle can cause pain that results in compensatory movement patterns, muscle tension, and secondary musculoskeletal problems over time. If you suspect saddle fit as a contributing factor, have both a vet and a qualified saddle fitter assess the horse.