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Riders and trainers have written about the one-sided horse for centuries. Some horses find it easier to the left; others resist collection on the right. The conventional explanation — natural laterality, a dominant side, brain hemisphere preference — has gone largely unchallenged in equestrian literature. Leslie-Anne Kennedy’s thesis challenges it directly.

The argument Kennedy develops is that what riders interpret as natural crookedness may in many cases be the observable consequence of Type 1 or Type 2 osteopathic spinal lesion patterns — functional dysfunctions identifiable through systematic assessment, and addressable through osteopathic treatment. This is not a theoretical exercise. Kennedy applies Fryette’s three laws of spinal motion — the foundational framework for understanding how vertebral segments move and restrict — to specific performance difficulties in elite dressage, using the counter change of hand in canter as her central example.

The analysis is forensic. In a Type 1 scoliosis lesion pattern, where sidebending has become fixed in one direction, Kennedy traces how the imbalance cascades through the flying change, the half pass, and the quality of the canter strike-off. The horse is not being difficult. Its spine has a structural reason for what it can and cannot do in each direction.

A case study of a performance mare brings the theory into sharp focus. A combination of occiput-atlas restriction, coxo-femoral dysfunction, gluteal reactivity, and a subtle proprioceptive deficit pointed clearly to a Type 2 lesion pattern. The mare’s gait, her resistance on the left rein, her asymmetric footfall — all of it mapped coherently onto the osteopathic findings. Osteopathic Articular Balancing produced measurable positive results.

The thesis raises a question that should give every rider pause: when a horse resists a movement, how often do we ask whether it physically can, rather than whether it will? Kennedy’s answer, backed by assessment protocols and case evidence, makes a compelling argument for osteopathic evaluation as standard practice in performance horse management.

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The FEI Dressage Handbook lists open mouth, tilted head, and broken neckline as disobedience. It is a classification that has frustrated researchers, welfare advocates, and practitioners for years — because each of those behaviours can equally signal that a horse is in pain. Kirstin Dunncliff’s thesis takes aim at this conflation and asks a direct question: if osteopathy reduces musculoskeletal pain in the performance horse, does behaviour improve as a consequence?

The foundation of the argument is built carefully. Horses are prey animals, evolved to suppress outward signs of vulnerability — including pain — in the presence of predators, which, functionally, includes us. Dunncliff draws on research demonstrating that horses exhibit significantly fewer pain behaviours when a caregiver is present, and that more than a third of horses in one study stopped displaying discomfort entirely when observed directly. This masking means that by the time a behaviour problem is visible enough to be labelled naughtiness, the underlying pain may have been present for some time.

The thesis provides a thorough survey of the tools now available for identifying equine pain — the Horse Grimace Scale, and Dr Sue Dyson’s Ridden Horse Pain Ethogram, which identifies 24 behaviours that, when eight or more are present, indicate musculoskeletal pain with high probability. These are not abstract research instruments; they are practical tools any equine professional can apply at the yard.

Against this backdrop, Dunncliff examines the osteopathic evidence. Studies of sacroiliac joint treatment, cranial osteopathy, and joint manipulation show measurable improvements in gait, posture, and pain threshold. One study recorded 79% positive outcomes following osteopathic treatment for back pain and poor performance. Another showed significant increases in beta-endorphin following treatment — a physiological marker of the body’s own pain-relief response being activated.

The honest conclusion is that the research base, while promising, still needs larger controlled trials that explicitly link osteopathic treatment to observable behavioural change over time. But the direction of the evidence is clear enough to act on. This thesis is essential reading for anyone who has ever been told their horse is simply being difficult.

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Walk into almost any equestrian yard and you will find horses on regular bodywork schedules and riders who have never considered booking a session for themselves. That imbalance sits at the heart of Katie McRory’s research. As a Craniosacral Therapist, Registered Massage Therapist and manual osteopathic practitioner, she noticed that only around ten percent of the riders in her practice received regular bodywork — and set out to understand what that gap might cost the horse.

The study assessed eight horse-and-rider pairs over a four-to-six week period. Riders were evaluated for postural and tissue restrictions while standing and in a supine position. Horses were assessed osteopathically, in free movement, under saddle with their own rider, and then again under saddle with an experienced professional — the latter providing an independent baseline against which rider-specific effects could be measured.

The results are striking in their consistency. Seven of the eight riders weighted the right side of their horse more heavily than the left. Patterns of restriction in the horse — across the shoulder, spine, hip, neck, poll and TMJ — aligned predictably with the specific dysfunction present in the rider. A hip restriction in the rider correlated with increased load on the corresponding side of the horse; a twist through the rider’s torso produced a recognisable signature in the horse’s lateral bend and shoulder mobility.

McRory develops a series of dysfunction statements from the data, grounded in the physics of load and torque and supported by Freyette’s Laws of spinal motion. The professional rider’s horse, notably, showed the least dysfunction of any pair in the study — demonstrating that skill and balance in the saddle can substantially offset the effects.

The conclusion is unambiguous: treating the horse while the rider’s dysfunction remains unaddressed is, at best, a maintenance strategy. For resolution, both partners need care. The data points clearly in that direction, and the thesis makes a compelling case for expanding the conversation around equine health to include the person on top.

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Sacroiliac injury is one of the more elusive diagnoses in equine practice. The region sits deep beneath large muscle masses, the clinical signs are often ambiguous, and the gold-standard diagnostic tool — nuclear scintigraphy — sits behind a cost barrier that many owners cannot cross. The result is that a significant number of horses with chronic hindlimb lameness carry an unconfirmed sacroiliac component, managed as best they can be with the tools available.

Katalin Kincses-Jánosi writes from a dual position of authority — a veterinarian with a PhD who has also trained as an equine osteopath. Her thesis opens with a scholarly review of sacroiliac anatomy, clinical presentation, diagnostic approaches and rehabilitation principles, before narrowing into a case study that brings all of that knowledge to bear on a single patient: a senior chestnut Hungarian halfbred mare with persistent low-to-medium grade left hindlimb lameness.

The mare had already undergone arthroscopy for a separate stifle issue. The lameness remained. A subsequent diagnosis of fibrotic myopathy of the hamstrings added further complexity, and it was into this layered clinical picture that osteopathic manual treatment was introduced. Over a series of sessions spanning several months, Kincses-Jánosi documents her findings in detail — pelvic hypermobility, gluteal sensitivity, lumbar stiffness, asymmetrical rib cage response — and records the specific techniques applied, from whole-body osteoarticular balancing to strain-counterstrain on acupressure points to high-velocity low-amplitude pelvic manipulation.

Woven through the treatment sessions is a progressively evolving exercise programme: dynamic mobilisation of the back, pelvic flexion work, ground pole sequences and lateral movement exercises, each calibrated to the mare’s capacity at each stage and designed to build the deep stabilising musculature that the sacroiliac region depends upon.

What makes this thesis genuinely instructive is its honesty. Progress was not linear — an early introduction of cross-country terrain exercises temporarily worsened the lameness. The author reflects on why, adjusts, and continues. For practitioners working with complex, long-standing cases in older horses, this is an account worth reading in full.

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Poor performance in the sport horse is one of the most commonly encountered problems in equine practice, yet it remains one of the least systematically addressed. The horse that is reluctant to work, loses ground in the final furlongs, stiffens through turns, or simply fails to meet expectations is often passed through multiple treatments before anyone stands back and asks the right questions. Juan Garcia’s thesis is an attempt to provide the framework for doing precisely that.

Garcia structures his approach around Andrew Taylor Still’s four foundational principles of osteopathy and applies them to a clear functional hierarchy of performance problems: pain management, proprioceptive deficits, stiffness, weakness, and neuromuscular control. Each category receives its own clinical logic, its own manual therapy indications, and its own body of supporting evidence. The distinction between mobilisation — controlled movement within physiological range — and manipulation — force taken beyond that range — is carefully drawn, with the clinical reasoning for choosing one over the other made explicit.

The manual therapy toolkit Garcia presents is broad and practically grounded. Massage therapy, passive stretching, joint mobilisation, and spinal manipulation are all discussed in terms of specific indications rather than general application. Particularly valuable is the section on neuromuscular rehabilitation, which covers exercises rarely discussed in short-form clinical resources: limb circumduction, pelvic flexion reflex work, sternal elevation, and tail traction. Each is presented with clear diagnostic and therapeutic rationale.

Garcia also draws on case data to illustrate the real-world impact of these approaches — a private stable study in Mexico found that 82.5% of horses receiving manual therapy improved their racing times, compared to 30% in the control group. Evidence from show jumping contexts reinforces the pattern: rider satisfaction with movement quality improved universally following structured manipulative therapy.

What makes this thesis particularly useful is its honesty about limits. Manual therapy, Garcia argues, is not a solution to every performance problem. Understanding when it applies — and when it does not — is as important as knowing the techniques themselves. For practitioners working in sport horse practice, this is a clear-eyed, clinically useful piece of work.

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Every time a horse moves — whether walking across a field or landing from a jump — an intricate network of muscles, tendons, ligaments and fascia works to suspend the thorax between the forelimbs and direct that power toward purposeful movement. This network, known as the thoracic sling, is the horse’s core stability system. Unlike humans, the horse has no clavicle, no bony connection between forelimb and trunk. That single anatomical fact has enormous consequences — for movement quality, for soundness, and for how we approach dysfunction when it arises.


This thesis offers a richly detailed account of the thoracic sling’s anatomy and function: the serratus ventralis, the deep and superficial pectorals, the rhomboids, trapezius, and the dorsal scapular ligament that anchors the scapula to the spine. Each structure is examined in terms of what it contributes to the whole — how energy is stored and released, how the ribcage is suspended, how the forelimb lines of protraction, retraction, abduction and adduction operate in a quadruped without a collar bone. The myofascial connections that link these structures to the spiral line, the lateral line, and the deep ventral line are explored with reference to both veterinary and human anatomical research, drawing a picture of connectivity that makes the osteopathic principle of treating the whole body not just a philosophy but a functional necessity.

The consequences of thoracic sling dysfunction are wide-ranging and often misread. Resistance to lateral bend, difficulty in canter, fatigue, asymmetry under saddle, even behavioural changes — all can trace a pathway back to this region. The thoracic outlet, through which the vagus nerve, phrenic nerve, and major vessels pass, means that dysfunction here can ripple into respiratory, digestive, and neurological function. The author makes a persuasive case that this area is significantly under-diagnosed in equine practice.

Osteopathic articular balancing, functional technique, positional release, myofascial release and craniosacral techniques are presented as the tools best suited to restoring thoracic sling function — not because they are gentle, but because they are appropriately matched to the complexity and the sensitivity of the structures involved.