Naughton Dunn

Naughton Dunn, M.A., M.B., Ch.B. (1884 – November 19, 1939) was an acclaimed Scottish-born British orthopaedic surgeon and foundational leader of the interwar orthopaedic golden age. Revered internationally for inventing the Naughton Dunn triple arthrodesis for the definitive reconstruction of paralytic foot deformities, pioneering the subcortical osteotomy (‘shingling’) technique for recalcitrant fracture non-unions, and serving as the chief architect and senior surgeon of the Royal Orthopaedic Hospital in Birmingham, Dunn combined biomechanical ingenuity with clinical craftsmanship. As a devoted disciple of Sir Robert Jones and President of the British Orthopaedic Association (1938–1939), he helped transform orthopaedics from an empirical discipline of passive splinting and manipulative correction into a modern surgical specialty founded upon rigorous mechanical principles and restorative biology.

1. The Shoulders of Giants: Historical Context & Significance

During the early decades of the twentieth century, orthopaedic surgery confronted two monumental clinical crises: the ravages of epidemic acute anterior poliomyelitis and the catastrophic musculoskeletal destruction wrought by the First World War. Infantile paralysis left thousands of children and adolescents with permanent, progressive lower limb deformities. Among the most debilitating was paralytic calcaneocavus and drop foot, where paralysis of the gastrocnemius-soleus complex left the anterior dorsiflexors unopposed. As affected children attempted to bear weight, the calcaneus tilted into steep vertical dorsiflexion while the forefoot plunged downward, concentrating crushing loads upon a small, callused heel pad and rendering plantigrade ambulation impossible without cumbersome callipers and steel braces. Contemporary interventions—ranging from simple subcutaneous tenotomies and soft-tissue reefings to blind subtalar fusions—invariably failed because they ignored the abnormal lever arms of the foot; without muscular balance, arthrodesed feet still collapsed under the unyielding mechanical demands of stance.

Simultaneously, the trenches of the Great War overwhelmed military hospitals with massive compound fractures, segmental bone loss, and extensive peripheral nerve lacerations. High rates of recalcitrant pseudoarthrosis and chronic non-union threatened thousands of young soldiers with limb amputation or permanent infirmity. Traditional surgical bone grafting of the era was perilous: large autografts required wide surgical stripping, which devascularized host bone, invited fulminant sepsis in contaminated scar beds, and frequently culminated in complete graft necrosis. Orthopaedic surgery urgently required leaders capable of bridging the mechanical discipline of skeletal reconstruction with the biological imperatives of blood supply and tissue preservation.

“If I have seen further, it is by standing on the shoulders of giants.”

Sir Isaac Newton (1675) / Bernard of Chartres

Modern foot and ankle surgeons, pediatric reconstructive specialists, and traumatologists stand squarely upon the shoulders of Naughton Dunn. Possessing a profound understanding of dynamic functional anatomy and the biomechanics of gait, Dunn revolutionized the surgical management of the paralytic foot. Rather than merely stiffening the hindfoot, he recognized that durable stability required altering the lever arm of the entire foot. By excising the navicular bone and displacing the forefoot posteriorly beneath the talus, Dunn created an elegant, self-balancing biomechanical construct that restored plantigrade gait and eliminated the need for external braces. In traumatology, his concept of “subcortical osteotomy” or “shingling” anticipated modern biological osteosynthesis by decades, proving that bone union could be provoked through meticulous stimulation of the periosteal cambium layer without stripping vital host vasculature. Every clinician who plans a stabilizing hindfoot arthrodesis or mobilizes corticoperiosteal flaps for fracture healing works within the conceptual lineage forged by Naughton Dunn.

2. Early Life, Formative Education & Career Milestones

Education and Formative Surgical Training

Naughton Dunn was born in Aberdeen, Scotland, in 1884 into a family that prized academic achievement and Scottish intellectual rigor. He matriculated at the University of Aberdeen, first completing a Master of Arts (M.A.) degree in 1904, which cultivated his lifelong eloquence, analytical clarity, and precision of expression. Turning his formidable energies to medicine, he entered the Aberdeen Medical School, where he achieved an exemplary academic record, graduating with the degrees of Bachelor of Medicine and Bachelor of Surgery (M.B., Ch.B.) with honours in 1909.

Drawn to the rapidly emerging discipline of reconstructive surgery, Dunn traveled south to Liverpool to seek training under the undisputed father of modern British orthopaedic surgery, Sir Robert Jones. Appointed house surgeon at the Royal Southern Hospital in Liverpool, Dunn quickly established himself as one of Jones’s most gifted and dedicated disciples. In the clinics and operating theatres of Liverpool, Dunn immersed himself in Jones’s foundational teachings: the primacy of functional restoration, the meticulous use of mechanical splinting, the discipline of operative non-touch technique, and compassionate attention to the crippled child. Jones recognized in the young Aberdonian not only extraordinary operative dexterity, but a penetrating diagnostic intellect and an innate capacity for administrative organization. Dunn served as private assistant to Sir Robert Jones, forging a profound personal and professional bond that would shape the rest of his career.

With the outbreak of the First World War in 1914, Dunn entered active military service, receiving a commission in the Royal Army Medical Corps (RAMC). Rising rapidly to the rank of Major, he was deployed to military orthopaedic centers, including the famous Military Orthopaedic Hospital at Shepherd’s Bush in London under the direct command of Sir Robert Jones, who had been appointed Director-General of Military Orthopaedics. Dunn treated catastrophic bullet and shrapnel wounds, complex non-unions, and peripheral nerve injuries, mastering the art of secondary nerve repair and tendon transposition. In 1917, recognizing the critical need for top-tier surgical leadership in the industrial heart of England, Sir Robert Jones dispatched Dunn to Birmingham to assume command of all military orthopaedic hospitals in the West Midlands region.

Academic Appointments and Clinical Leadership

Upon his arrival in Birmingham, Major Dunn encountered a fragmented system of convalescent homes and auxiliary hospitals struggling under the influx of thousands of wounded soldiers. With remarkable organizational energy, he centralized military trauma care, established specialized rehabilitation workshops, and introduced standardized protocols for fracture care and peripheral nerve reconstruction. His wartime success made him indispensable to the region, and following demobilization, the civic and medical leaders of Birmingham determined that Dunn must remain permanently in their city.

Dunn was appointed Senior Surgeon to the Royal Orthopaedic and Spinal Hospital in Birmingham and Lecturer in Orthopaedic Surgery at the University of Birmingham. During the 1920s, Dunn recognized that the care of crippled children and adult orthopaedic patients was severely hampered by division between voluntary societies and municipal hospitals. He spearheaded the historic amalgamation of the Birmingham Cripples’ Union, the Woodlands convalescent home at Northfield (generously donated by the Cadbury family), and the Royal Orthopaedic and Spinal Hospital in Broad Street. Under Dunn’s surgical leadership and institutional vision, these entities merged to create the unified Royal Orthopaedic Hospital (ROH) at The Woodlands, establishing Birmingham as one of the world’s preeminent centers for orthopaedic surgery and surgical training.

Dunn’s influence extended across the Midlands and into the Welsh borders. He maintained a close working relationship with Sir Robert Jones and Dame Agnes Hunt, serving as Surgical Director and Senior Surgeon at the Robert Jones and Agnes Hunt Orthopaedic Hospital in Oswestry, Shropshire. Travelling tirelessly between Birmingham, Oswestry, and regional clinics, Dunn established an integrated network of decentralized orthopaedic outpatient clinics across Warwickshire, Worcestershire, and Shropshire, ensuring that patients in remote rural districts received the same expert surgical evaluation as those in metropolitan teaching centers.

Within the national and international surgical community, Dunn was regarded with immense affection and respect. Known universally to his residents and colleagues as “N. D.”, he possessed a magnetic personality, a dry Scottish wit, and a brilliant clinical diagnostic instinct. In 1918, he stood among the visionary band of surgeons who co-founded the British Orthopaedic Association (BOA). Exactly two decades later, in 1938, his peers elected him President of the British Orthopaedic Association. Although his presidential tenure was tragically curtailed by the onset of a long and distressing illness, he led the association with wisdom during the fraught months leading up to the Second World War. Dunn died on November 19, 1939, at the premature age of fifty-five. To perpetuate his memory and fellowship, his former pupils and Midlands colleagues founded the Naughton Dunn Club, which continues to anchor the regional orthopaedic fraternity, while the prestigious annual Naughton Dunn Lecture commemorates his surgical legacy at national and regional meetings.

3. Core Orthopaedic Breakthroughs, Eponymous Signs & Innovations

Naughton Dunn’s contributions fundamentally altered the management of complex musculoskeletal disorders. Rather than viewing deformities as static anatomical flaws requiring forceful redressement, Dunn analyzed the dynamic mechanical vectors operating across joints, devising reconstructive operations that restored lasting biological and functional equilibrium.

Hallmark Anatomical, Diagnostic and Operative Contributions

• The Naughton Dunn Triple Arthrodesis: A definitive stabilizing operation for severe paralytic deformities of the foot, especially paralytic calcaneocavus and flail drop foot following poliomyelitis. The procedure combines complete excision of the navicular (scaphoid) bone, resection of a lateral wedge from the calcaneocuboid joint, and subtalar arthrodesis with posterior translation (retro-displacement) of the distal foot. This shifts the weight-bearing center posterior directly under the tibial axis and shortens the anterior lever arm.
• Subcortical Osteotomy (‘Shingling’) for Fracture Non-Union: An innovative biological operative technique for ununited fractures and pseudarthroses. Longitudinal osteoperiosteal flaps and slivers of cortical bone are elevated across the fracture gap with osteotomes while maintaining their periosteal vascular attachments, activating the osteogenic cambium layer and creating an abundant vascularized in-situ bone graft bed without devitalizing host bone.
• Comminuted Olecranon Fracture Excision and Triceps Advancement (1939): A pioneering approach to severe, non-reconstructible articular fractures of the olecranon process. Dunn demonstrated that radical excision of comminuted intra-articular fragments followed by direct transosseous advancement and suturing of the triceps tendon into the proximal ulnar shaft permitted stable, early active mobilization and avoided the non-unions, hardware pain, and secondary osteoarthritis common with primitive internal fixation.
• Dynamic Tendon Transposition in Upper Extremity Peripheral Nerve Injuries (1918): Landmark operative paradigms developed during World War I for irreversible radial, median, and ulnar nerve paralyses. Dunn established principles of direct, straight-line muscular routing, appropriate tensioning, and pre-operative joint mobilization to restore active wrist extension, finger grasp, and thumb opposition.
• Institutional Unification of the Royal Orthopaedic Hospital, Birmingham: The organizational synthesis that brought together The Woodlands in Northfield, the Birmingham Cripples’ Union, and the Royal Orthopaedic and Spinal Hospital, establishing a modern unified orthopaedic institution supported by an extensive decentralized regional clinic system.

The biomechanical architecture of the Naughton Dunn triple arthrodesis represented an extraordinary intellectual leap in reconstructive foot and ankle surgery. In a normal foot, the triceps surae acts through the Achilles tendon on the posterior lever arm of the calcaneus, balancing the anterior lever arm across the ankle and subtalar joints. When acute poliomyelitis destroyed the anterior horn cells supplying the calf muscles, the gastrocnemius-soleus complex was rendered completely flaccid while the anterior dorsiflexors often remained intact. This uncoupled dynamic pulled the forefoot into dorsiflexion while gravity and weight-bearing tilted the os calcis into an almost vertical orientation. During stance, body weight acted far behind the ankle axis, driving the midfoot into sharp cavus and causing severe instability. Previous attempts at subtalar arthrodesis failed because they merely bonded the deformed joints together without addressing the disproportionate anterior lever arm; under the relentless torque of walking, the construct broke down.

Dunn solved this dilemma by addressing the underlying lever arms. Executed through an anterolateral incision extending from below the external malleolus to the base of the second metatarsal, his technique began with meticulous extraperiosteal exposure of the midtarsal and subtalar joints. Dunn excised the entire navicular bone, removing the anatomical spacer between the talar head and the cuneiforms. A calculated lateral wedge was then resected from the calcaneocuboid joint, and the cartilaginous surfaces of the anterior and posterior subtalar facets were denuded down to bleeding cancellous bone. With the navicular completely removed, the forefoot was displaced posteriorly (retro-displaced), allowing the posterior surfaces of the three cuneiforms to dock directly against the head and neck of the talus, while the cuboid shifted backward along the calcaneus. This posterior translation shortened the anterior lever arm of the foot and lengthened the effective posterior lever arm. Most importantly, it moved the fulcrum of body weight posterior, centering the line of gravity directly down the tibial shaft and into the mid-tarsal block. Ground reaction forces no longer produced a deforming dorsiflexion torque, allowing patients with complete calf paralysis to walk with a stable, plantigrade, brace-free foot.

In the management of ununited fractures of long bones, Dunn challenged the orthodox surgical dogma of his era. Standard surgical teaching dictated that non-union required aggressive resection of the dense eburnated bone ends and wide excision of the intervening fibrous pseudarthrosis tissue, followed by massive onlay cortical bone grafting. However, extensive circumferential periosteal stripping stripped the remaining blood supply from the fractured cortex, leaving an ischemic segment prone to indolent non-union or catastrophic infection. Dunn questioned this destructive approach, intuiting that the fibrous tissue bridging a pseudarthrosis contained latent osteogenic potential if provided with adequate mechanical stability and biological stimulus.

In his subcortical procedure—later popularized globally as “shingling”—Dunn utilized a sharp, thin osteotome to raise multiple longitudinal slivers, flakes, or shingles of cortical bone directly from the ununited shaft across the fracture line, extending several centimeters above and below the defect. Crucially, these cortical flakes were elevated without separating them from their overlying periosteal sleeve. By lifting these vascularized osteoperiosteal flaps away from the underlying host bone while keeping their soft-tissue attachments intact, Dunn stimulated the cambium layer of the periosteum, the body’s primary osteogenic engine. The raised shingles created a rich, hyperemic envelope of living autologous bone chips bathed in vascularized tissue, dramatically expanding the cross-sectional surface area for new bone formation. Dunn demonstrated that this gentle, non-destructive biological intervention induced rapid callus bridging across previously unyielding pseudarthroses, avoiding the morbidity of distant bone graft harvest and laying the conceptual foundation for modern biological osteosynthesis.

In his 1939 paper in the British Medical Journal, published shortly before his death, Dunn tackled one of the most perplexing challenges in acute skeletal trauma: the severely comminuted fracture of the olecranon process. In an era before modern internal fixation was perfected, attempts to reconstruct multiple intra-articular fragments with wire cerclages or external splints frequently resulted in non-union, fibrous pseudarthrosis, prominent subcutaneous hardware, or painful incongruous post-traumatic arthritis with severe loss of elbow flexion. Dunn proposed a bold alternative: if the articular fragment comprised less than one-third to one-half of the olecranon and was extensively fragmented, all loose articular fragments should be cleanly excised down to healthy, viable bone. The terminal tendon of the triceps brachii was then dissected, advanced distally, and securely anchored directly into the raw proximal dorsal cortex of the ulna via heavy transosseous sutures drilled through the bone. Dunn showed that because the coronoid process, anterior capsule, and collateral ligaments remained intact, joint stability was fully preserved. Free of articular steps or unstable hardware, the elbow could be mobilized actively within days, yielding an excellent functional arc of motion, robust triceps extension power, and complete relief from chronic articular pain.

4. Master Class Pro-Tip

In reconstructing the paralytic calcaneocavus foot via triple arthrodesis, mere joint denudation is mechanically insufficient. Total excision of the navicular (scaphoid) bone combined with posterior translation of the distal midfoot directly under the talar neck is the foundational maneuver. By shortening the anterior lever arm and moving the fulcrum of body weight posterior, this retro-displacement neutralizes the deforming dorsiflexion moment arm and achieves stable, plantigrade foot balance despite absent triceps surae power.

Master Class Surgical Pearl: Biomechanical Balancing in Triple Arthrodesis

5. Primary Landmark Publications & Bibliography

The foundational contributions of Naughton Dunn are preserved in these original landmark monographs and peer-reviewed surgical literature:

• Dunn, N. (1922). Stabilizing Operations in the Treatment of Paralytic Deformities of the Foot. Proceedings of the Royal Society of Medicine, 15(Surg Sect), 15–22. https://doi.org/10.1177/003591572201502020
• Dunn, N. (1918). The treatment of disabilities of the upper extremity in military surgery. British Journal of Surgery, 6(22), 248–258. https://doi.org/10.1002/bjs.1800062208
• Dunn, N. (1928). The Surgery of Muscle and Tendon in Relation to Infantile Paralysis. Proceedings of the Royal Society of Medicine, 22(2), 243–248. https://doi.org/10.1177/003591572802200266
• Dunn, N. (1939). Fractured Olecranon. British Medical Journal, 1(4074), 214–215. https://doi.org/10.1136/bmj.1.4074.214
• Dunn, N. (1937). The Surgery of Muscle and Tendon in Relation to Paralysis and Injury. Postgraduate Medical Journal, 13(144), 362–367. https://doi.org/10.1136/pgmj.13.144.362

6. Biographical Provenance & Acknowledgments

This historical biography was synthesized for the OrthopaedicsOne Knowledge Network as part of A Who’s Who of Orthopaedics, adapted and expanded from the foundational biographical directory Who’s Who in Orthopedics (Springer-Verlag London, 2005, page 88) edited by Seyed B. Mostofi, BSc, MBBS, FRCS (Ed).