Monteggia and Galeazzi Fractures
High-yield overview
Forearm Ring Concept | Bado Classification | Fracture of Necessity | Fix the Bone, Reduce the Joint
65%Bado Type I (anterior) - most common Monteggia overall
80%Galeazzi conservative failure rate in adults (Mikic)
PosteriorBado Type II is the commonest pattern in adults
7.5 cmRadius fracture within 7.5cm of joint = high DRUJ instability
Bado Classification (Monteggia)
Type I (~65%)
PatternAnterior radial head dislocation, anterior ulna angulation
TreatmentORIF ulna; radial head usually reduces
Type II (~18%)
PatternPosterior/posterolateral dislocation; PIN risk; commonest in adults
TreatmentORIF ulna; address radial head/coronoid
Type III (~16%)
PatternLateral dislocation, ulnar metaphyseal fracture; paediatric
TreatmentReduction; fix ulna if unstable
Type IV (~1%)
PatternAnterior dislocation with both-bone proximal-third fractures
TreatmentORIF radius + ulna
Critical Must-Knows
- Forearm ring concept: PRUJ + IOM + DRUJ - if one bone fractured with displacement, disruption must occur elsewhere
- Monteggia = proximal Ulna fracture + radial head dislocation (M = Misses radial head at elbow)
- Galeazzi = distal Radius fracture + DRUJ disruption (G = Got the wrist DRUJ) - 'fracture of necessity'
- Radiocapitellar line: Draw along radial neck/shaft axis - must pass through capitellum on ALL views
- Key principle: Fix the fractured bone anatomically and the joint usually reduces spontaneously
Clinical Pearls
- "Bado classification for Monteggia: Type I anterior (most common overall), Type II posterior (PIN risk, commonest in adults), Type III lateral, Type IV both bones
- "'Any isolated ulna fracture is a Monteggia until proven otherwise' - always image the elbow
- "Galeazzi DRUJ assessment: After ORIF radius, stress test in neutral/pronation/supination - supination is most stable
- "Missed Monteggia = major medico-legal issue - chronic radial head dislocation has poor reconstruction outcomes
Critical Forearm Exam Points
Monteggia (Proximal)
Misses the radial head (proximal = elbow). Any isolated ulna fracture is a Monteggia until proven otherwise.
Galeazzi (Distal)
Got the DRUJ (distal = wrist). Distal radius fracture with DRUJ disruption. "Fracture of necessity" - surgery in adults.
Ring Concept
The forearm is a ring structure. If one bone is fractured and displaced, there must be disruption elsewhere (either the other bone or a joint).
Imaging Rule
Always image the entire forearm including joints above (elbow) and below (wrist). Missing a joint injury is a major pitfall.
At a Glance
Monteggia and Galeazzi are the two classic forearm fracture-dislocations that test the ring concept: fix the fractured bone anatomically and the dislocated joint usually reduces. Monteggia = proximal ulna fracture + radial head dislocation (Bado I-IV). Galeazzi = distal-third radius fracture + DRUJ disruption, the "fracture of necessity". The dominant mistake in both is missing the associated joint injury.
Mnemonic
MUGRMonteggia vs Galeazzi
| M | Monteggia M = Misses the radial head at elbow |
| U | Ulna Proximal ulna fracture + radial head dislocation (upper) |
| G | Galeazzi G = Got the DRUJ at wrist |
| R | Radius Distal radius fracture + DRUJ disruption |
| M | Monteggia M = Misses the radial head at elbow | G | Galeazzi G = Got the DRUJ at wrist |
| U | Ulna Proximal ulna fracture + radial head dislocation (upper) | R | Radius Distal radius fracture + DRUJ disruption |
Hook:MUGR: Monteggia = Upper/elbow, Galeazzi = wRist
Mnemonic
APLBBado Classification (Monteggia)
| A | Anterior (Type I) Radial head dislocates anteriorly - commonest overall |
| P | Posterior (Type II) PIN at risk; commonest in adults |
| L | Lateral (Type III) Common in children, metaphyseal ulna fracture |
| B | Both bones (Type IV) Rarest, both radius and ulna fractured |
| A | Anterior (Type I) Radial head dislocates anteriorly - commonest overall | L | Lateral (Type III) Common in children, metaphyseal ulna fracture |
| P | Posterior (Type II) PIN at risk; commonest in adults | B | Both bones (Type IV) Rarest, both radius and ulna fractured |
Hook:APLB = Anterior-Posterior-Lateral-Both - directions the radial head goes
Mnemonic
FASGaleazzi Management
| F | Fix radius ORIF with 3.5mm plate via volar Henry approach |
| A | Assess DRUJ Stress test in neutral/pronation/supination intraop |
| S | Stabilise If unstable: supination cast, K-wire, or TFCC repair |
| F | Fix radius ORIF with 3.5mm plate via volar Henry approach |
| A | Assess DRUJ Stress test in neutral/pronation/supination intraop |
| S | Stabilise If unstable: supination cast, K-wire, or TFCC repair |
Hook:Be FASt to recognise and treat Galeazzi - Fix, Assess, Stabilise
Overview and Epidemiology
Monteggia and Galeazzi fractures are the two classic forearm fracture-dislocations that test the ring concept: because the radius and ulna are bound at both ends (PRUJ and DRUJ) and along the shaft (interosseous membrane), a displaced fracture of one bone mandates a corresponding joint or bony disruption elsewhere. Missing the associated joint injury is the central pitfall in both.
- Monteggia = proximal ulna fracture + radial head dislocation. Classified by Bado I-IV. Type I (anterior) is most common overall and the dominant paediatric pattern; Type II (posterior) is the commonest pattern in adults (Ring, JBJS Am 1998).
- Galeazzi = fracture of the distal third of the radius + DRUJ disruption. The "fracture of necessity" - conservative treatment fails in ~80% of adults (Mikic, JBJS Am 1975), so adults require ORIF.
Epidemiology (global):
- Monteggia lesions account for roughly 1-2% of forearm fractures; bimodal, with a paediatric peak (fall on outstretched hand) and an adult peak (higher-energy trauma, often Bado II).
- Galeazzi fracture-dislocations comprise ~3-7% of forearm fractures, predominantly adults aged 30-50, frequently work- or sport-related.
- Across all settings the governing principle is identical: fix the fractured bone anatomically and the joint usually reduces.
Anatomy and Biomechanics
The Forearm Ring Concept
The forearm functions as a closed ring whose three links must all be intact for normal rotation:
- Proximal radioulnar joint (PRUJ) - radial head in the radial notch of the ulna; stabilised by the annular ligament. Disrupted in Monteggia.
- Interosseous membrane (IOM) - the central band transmits ~70% of axial load from the radius to the ulna; the key longitudinal stabiliser.
- Distal radioulnar joint (DRUJ) - ulna head in the sigmoid notch of the radius; primary stabiliser is the TFCC. Disrupted in Galeazzi.
Clinical consequence: If one bone fractures and displaces, the ring must fail elsewhere. Hence an isolated displaced ulna fracture is a Monteggia until proven otherwise, and any distal radius fracture demands DRUJ assessment.
DRUJ stabilisers (relevant to Galeazzi):
- TFCC (triangular fibrocartilage complex) - primary stabiliser; dorsal and palmar radioulnar ligaments
- Interosseous membrane and pronator quadratus
- ECU subsheath
Ring Structure Components
| Structure | Location | Clinical Relevance |
|---|---|---|
| PRUJ | Elbow | Radial head dislocation in Monteggia |
| IOM | Central forearm | Longitudinal stability; lost in Essex-Lopresti |
| DRUJ | Wrist | Disrupted in Galeazzi |
Mechanism of Injury
Monteggia:
- FOOSH with forced hyperpronation (classically Type I, anterior)
- Direct blow to the posterior proximal forearm
- Axial load through a supinated forearm (associated with Type II in adults)
Galeazzi:
- FOOSH with the forearm pronated
- Direct dorsoradial blow to the wrist
- Axial load with rotation
Classification Systems
Bado Classification of Monteggia Lesions
Classified by the direction of radial head dislocation and the associated ulna fracture pattern.
- Type I - Anterior radial head dislocation; ulna fracture with anterior angulation. Most common type overall and the dominant paediatric pattern. Mechanism: hyperpronation.
- Type II - Posterior/posterolateral radial head dislocation; ulna fracture with posterior angulation. Commonest pattern in adults and frequently associated with radial head and coronoid fractures. Highest PIN palsy association.
- Type III - Lateral/anterolateral radial head dislocation; ulnar metaphyseal fracture. Largely a paediatric injury.
- Type IV - Anterior radial head dislocation with fractures of both radius and ulna in the proximal third.
Bado Types Summary
| Type | Radial head | Ulna fracture | Note |
|---|---|---|---|
| I | Anterior | Anterior angulation | Commonest overall / paediatric |
| II | Posterior | Posterior angulation | Commonest in adults; PIN risk |
| III | Lateral | Metaphyseal | Paediatric |
| IV | Anterior | Both-bone proximal third | Rare |
Clinical Assessment
Monteggia - examination:
- Pain, swelling and deformity of the proximal forearm/elbow
- Palpable/dislocated radial head; reduced elbow flexion-extension and forearm rotation
- Always test PIN function (especially Type II): finger and thumb extension at MCP joints, wrist extension in radial deviation. Document pre- and post-operatively.
Galeazzi - examination:
- Wrist pain and swelling; tenderness over the DRUJ and ulnar fovea
- Prominent ulna head (dorsal or palmar depending on rotation)
- Painful, restricted forearm rotation
- Assess the median nerve / AIN given the volar surgical territory
Radiographic features:
| Finding | Monteggia | Galeazzi |
|---|---|---|
| Fracture location | Proximal ulna | Distal third of radius |
| Joint to assess | Radial head position | DRUJ |
| Key sign | Radiocapitellar line disrupted | DRUJ widening over 2mm vs contralateral; radial shortening; ulnar styloid base fracture |
Radiocapitellar Line
On every elbow view (AP, lateral, oblique), a line drawn along the axis of the radial neck/shaft must pass through the centre of the capitellum. If it misses, the radial head is dislocated. This single check is how missed Monteggia injuries are caught.
Investigations
Radiographic Assessment
Essential views:
- AP and lateral of the entire forearm
- Dedicated elbow views (AP, lateral) - mandatory for any ulna fracture
- Dedicated wrist views (PA, lateral) - mandatory for any distal radius fracture
- Contralateral comparison views are invaluable for ulnar variance and DRUJ width
Key radiographic features - Monteggia:
- Proximal ulna fracture with angulation
- Radiocapitellar line disrupted on at least one view
- Coronoid and radial head fractures in Bado II (look specifically)
Key radiographic features - Galeazzi:
- Distal radius fracture (middle/distal third junction)
- DRUJ widening over 2mm compared with the contralateral side
- Ulnar styloid (base) fracture indicating TFCC avulsion
- Radial shortening / loss of radial height
Imaging Checklist
| Finding | Monteggia | Galeazzi |
|---|---|---|
| Fracture location | Proximal ulna | Distal radius |
| Joint to assess | Radial head position | DRUJ widening |
| Key line / measure | Radiocapitellar line | Radial height + DRUJ width |
Management Algorithm
Algorithm
Adults - operative:
- ORIF of the ulna restores length, alignment and IOM tension.
- 3.5mm DCP or LCP; compression plating for simple patterns, bridge plating if comminuted
- Anatomic reduction is the single most important step
- Assess the radial head after ulna fixation.
- Reduces concentrically and is stable in most cases - no further action
- Irreducible/unstable: explore for interposed annular ligament/capsule; repair or reconstruct as needed
- In Bado II address associated radial head and coronoid fractures
- Post-op: brief protection then early ROM; avoid forced rotation initially.
Children:
- Closed reduction of the ulna often restores the radial head
- Fix the ulna (flexible nail or plate) if the reduction is unstable or for length-unstable patterns
Surgical Technique
Monteggia ORIF
Position and approach:
- Supine, arm table, tourniquet
- Posterior (subcutaneous border) approach to the proximal ulna; lateral Kocher interval (anconeus / ECU) if the radial head must be explored
Ulna fixation:
- 3.5mm DCP or LCP
- Compression plating for simple patterns; bridge plating if comminuted
- Restore length and correct angulation precisely - this is what reduces the radial head
Radial head assessment:
- After fixing the ulna, take the elbow through full flexion-extension and pronation-supination
- Concentric, stable reduction in most cases
- If unstable/irreducible: explore via Kocher, remove interposed annular ligament/capsule, repair or reconstruct the annular ligament; address radial head/coronoid fractures (Bado II)
Surgical Approaches
| Injury | Approach | Plate |
|---|---|---|
| Monteggia | Posterior ulna (+/- lateral Kocher) | 3.5mm DCP/LCP |
| Galeazzi | Volar Henry radius | 3.5mm or anatomic plate |
Key Differences
Monteggia vs Galeazzi Comparison
Differential Diagnosis
The differential is about recognising the whole injury rather than the obvious fracture, and distinguishing the fracture-dislocations from their mimics.
Forearm Fracture-Dislocation Differential
| Diagnosis | Fracture | Joint disruption | Distinguishing feature |
|---|---|---|---|
| Monteggia | Proximal ulna | Radial head (PRUJ) | Radiocapitellar line disrupted on elbow views |
| Galeazzi | Distal radius | DRUJ | DRUJ widening, radial shortening, ulnar styloid base fracture |
| Isolated ulna (nightstick) fracture | Ulna shaft, minimally displaced | None | Radial head congruent on all views (must exclude Monteggia) |
| Essex-Lopresti | Radial head | DRUJ + IOM | Longitudinal pain; IOM ruptured; do NOT excise radial head |
| Both-bone forearm fracture | Radius + ulna shafts | Usually none | Two shaft fractures without a joint dislocation |
| Congenital radial head dislocation | None | Chronic radial head dislocation | Bilateral, dome-shaped/hypoplastic capitellum, convex radial head, no trauma |
Complications
- Missed diagnosis - the most important and most preventable complication; up to half are missed initially, leading to chronic radial head dislocation that is difficult to reconstruct (see Controversies).
- Radial head instability - usually from inadequate ulna reduction; occasionally interposed annular ligament. Re-examine ulna alignment first.
- PIN palsy - associated with Bado II; usually neurapraxia that recovers; document function pre- and post-op.
- Proximal radioulnar synostosis / heterotopic ossification - more frequent after high-energy Bado II and radial head fixation.
- Stiffness - mitigated by early mobilisation once fixation is stable.
Postoperative Care
Rehabilitation Protocol
Monteggia:
- Brief backslab (~2 weeks) for wound/soft-tissue rest, then early elbow and rotation ROM
- Avoid extremes of pronation/supination for 4-6 weeks
- Aim for full ROM by 8-12 weeks
Galeazzi (stable DRUJ):
- Removable splint for comfort ~2 weeks, then early active ROM
- Progressive strengthening from ~6 weeks
Galeazzi (unstable DRUJ):
- Supination cast or K-wires for ~6 weeks, then ROM
- Delayed start but still aim for full ROM
Outcomes and Prognosis
Expected Results
Monteggia (acute):
- Good/excellent results in the majority with anatomic ulna fixation; in Ring's adult series 40 of 48 were excellent/good
- Unsatisfactory outcomes cluster in Bado II with associated radial head/coronoid injury
- Minor loss of terminal extension is common; forearm rotation usually preserved
Galeazzi (acute):
- Good results with anatomic radial fixation and a stable (or stabilised) DRUJ
- Worse outcomes with residual radial shortening or persistent DRUJ instability
Chronic / missed injuries:
- Significantly poorer; chronic Monteggia reconstruction in children gives meaningful but incomplete gains, and results are best when surgery is within one year (Chen 2018)
- Chronic DRUJ instability: variable results with reconstruction
Outcome Summary
| Injury | Acute Treatment | Chronic |
|---|---|---|
| Monteggia | Good/excellent in most (40/48 in Ring) | Better if within 1 year; incomplete |
| Galeazzi | Good with stable DRUJ | Variable with DRUJ reconstruction |
Evidence Base and References
Monteggia Fractures in Adults (Bado II Predominance)
Ring D, Jupiter JB, Simpson NS • J Bone Joint Surg Am (1998)
Key Findings:
- 48 adult Monteggia fractures, mean follow-up 6.5 years
- Bado type II (posterior) was the commonest adult pattern (38 of 48)
- 26 of 38 type II had associated radial head fractures; coronoid fractures common
- Stable anatomic plate fixation of the ulna gave excellent/good results in 40 of 48; unsatisfactory outcomes clustered in type II with radial head/coronoid involvement
Clinical Implication: In adults, anatomic plate fixation of the ulna is the foundation of treatment; the challenge is managing the associated radial head and coronoid injuries common in Bado type II.
Galeazzi 'Fracture of Necessity'
Mikic ZD • J Bone Joint Surg Am (1975)
Key Findings:
- 125 patients with Galeazzi-type fracture-dislocations (86 adults with the classic lesion)
- Conservative (cast) treatment failed in ~80% of adults; succeeded only in children
- Operative fixation of both the radius and the DRUJ gave excellent results in over half
- Established the 'fracture of necessity' concept - radial shortening perpetuates DRUJ instability
Clinical Implication: Conservative treatment of adult Galeazzi fractures is unreliable; anatomic radial fixation with attention to the DRUJ is mandatory.
Galeazzi: Treatment-Oriented Classification (7.5cm Rule)
Rettig ME, Raskin KB • J Hand Surg Am (2001)
Key Findings:
- 40 Galeazzi fractures treated with ORIF of the radial shaft
- Type I (fracture within 7.5cm of the distal radius articular surface): 12 of 22 had intraoperative DRUJ instability
- Type II (fracture over 7.5cm from the joint, middle third): only 1 of 18 unstable
- Distance of the radial fracture from the DRUJ predicts the need for DRUJ stabilisation
Clinical Implication: The more distal the radial fracture, the higher the chance of DRUJ instability after fixation - anticipate supplemental DRUJ stabilisation for fractures within 7.5cm of the joint.
Chronic (Missed) Monteggia in Children
Chen HY, Wu KW, Dong ZR, et al. • Int Orthop (2018)
Key Findings:
- 20 children with neglected radial head dislocation after missed Monteggia
- Open reduction plus ulnar lengthening/angulation osteotomy without annular ligament reconstruction
- Significant gains in elbow flexion, pain and stability (MEPI); radial head reduction maintained in 18 of 20
- Surgery within one year of injury gave better functional outcomes than later presentation
Clinical Implication: Correcting the ulnar deformity (osteotomy) is central to reducing a chronically dislocated radial head; early reconstruction outperforms delayed surgery, reinforcing the value of early diagnosis.
Bado Classification of the Monteggia Lesion
Bado JL • Clin Orthop Relat Res (1967)
Key Findings:
- Original description of the Monteggia lesion and its four types
- Types I-IV defined by direction of radial head dislocation and ulna fracture pattern
- Type I anterior is the most common type overall
- Remains the universal classification for describing Monteggia injuries
Clinical Implication: Bado's classification is the shared language for Monteggia lesions worldwide and directs both diagnosis and the surgical plan.
Full reference list:
- Bado JL. The Monteggia lesion. Clin Orthop Relat Res. 1967;50:71-86.
- Ring D, Jupiter JB, Simpson NS. Monteggia fractures in adults. J Bone Joint Surg Am. 1998;80(12):1733-44. PMID 9875931.
- Mikic ZD. Galeazzi fracture-dislocations. J Bone Joint Surg Am. 1975;57(8):1071-80. PMID 1201989.
- Rettig ME, Raskin KB. Galeazzi fracture-dislocation: a new treatment-oriented classification. J Hand Surg Am. 2001;26(2):228-35. PMID 11279568.
- Chen HY, Wu KW, Dong ZR, et al. The treatment of chronic radial head dislocation in Monteggia fracture without annular ligament reconstruction. Int Orthop. 2018;42(9):2165-72. PMID 29713746.
Controversies and Areas of Uncertainty
- Reconstruct vs accept the chronically dislocated radial head (paediatric Monteggia): Reconstruction (ulnar osteotomy +/- open reduction +/- annular ligament reconstruction) improves stability and pain but carries notable complication rates and unpredictable rotation, and outcomes deteriorate beyond one year. Some advocate observation in late/minimally symptomatic presentations. There is genuine debate over whether annular ligament reconstruction is necessary at all - Chen et al achieved maintained reduction in 18 of 20 children without it, relying on ulnar lengthening/angulation osteotomy.
- Need for trans-capitellar K-wires: Useful when radial head reduction is unstable, but they risk breakage and are avoided by some surgeons in favour of robust osteotomy correction.
- Bado II radial head and coronoid management: The decision to fix, replace or excise the radial head, and whether to fix small coronoid fragments, drives outcome in adult Monteggia and remains individualised.
- Galeazzi DRUJ: how to stabilise: Choice between K-wire transfixation, supination immobilisation, TFCC repair and ulnar styloid fixation is not standardised; the unifying principle is anatomic radial length restoration first, then test and treat residual instability.
- Ulnar styloid fixation: Whether to fix a styloid base fragment in an otherwise stable DRUJ is contested; isolated tip fractures generally do not need fixation.
Exam Viva Scenarios
Use these scenarios to practise clinical reasoning and management decisions
CLINICAL SCENARIOStandard
Scenario 1: Monteggia Type I - Acute ORIF and Radial Head Reduction
CLINICAL PROMPT
"A 35-year-old man presents to the emergency department after falling from a ladder onto his outstretched dominant right arm. He has pain and deformity of the proximal forearm. X-rays show a fracture of the proximal ulna with anterior angulation. On the AP view, the radial head appears congruent with the capitellum, but on the lateral view, the radial head appears to be slightly anterior to the capitellum. What is your diagnosis and how do you manage this injury?"
PRACTICAL APPROACH
This is a **Monteggia fracture-dislocation**, specifically **Bado Type I** - a proximal ulna fracture with **anterior radial head dislocation**. This classic exam case tests the candidate's ability to identify the subtle radial head dislocation that is easily missed. **Key diagnostic principle - radiocapitellar line**: On **every view** (AP, lateral, oblique), draw a line along the axis of the radial neck/shaft - it should pass through the **centre of the capitellum**. Here the lateral view shows the radial head anterior to the capitellum, confirming anterior dislocation, while the AP view looks deceptively normal. **Why it matters**: Monteggia injuries are frequently missed initially (up to 50% in some series), and a **missed Monteggia is a significant medico-legal issue** because chronic radial head dislocation presenting months later is difficult to treat. **Forearm ring concept**: the forearm is a ring via the PRUJ, IOM and DRUJ; a displaced ulna fracture mandates disruption elsewhere - hence the radial head dislocation. The teaching is 'any isolated ulna fracture is a Monteggia until proven otherwise'. **Bado classification**: Type I anterior (commonest overall, this case); Type II posterior (commonest in adults, PIN risk); Type III lateral/metaphyseal (paediatric); Type IV both-bone proximal third. **Management (adult, operative)**: supine, arm table, tourniquet; posterior approach to the proximal ulna. Perform **ORIF of the ulna** with a 3.5mm DCP or LCP, achieving **anatomic reduction** to restore length and alignment - this is the critical step. After fixation, take the elbow through full flexion-extension and rotation to confirm the radial head has reduced concentrically and is stable. If it is **unstable or irreducible**, explore via a lateral Kocher interval for interposed annular ligament/capsule and repair or reconstruct as needed. **Post-op**: short backslab for ~2 weeks then early ROM, avoiding forced rotation for 4-6 weeks. **Complications to mention**: missed diagnosis, radial head instability from inadequate ulna reduction, PIN palsy (mainly Type II, usually recovers), synostosis/HO and stiffness.
KEY CLINICAL POINTS
Radiocapitellar line must pass through the capitellum centre on ALL views - if it misses, the radial head is dislocated
Bado Type I = anterior radial head dislocation with anterior ulna angulation (most common type overall)
Anatomic ulna ORIF with a 3.5mm plate is the critical step - the radial head usually reduces once the ulna is reduced
Missed Monteggia is a medico-legal issue - chronic radial head dislocation has poor reconstruction outcomes
Forearm ring: an isolated displaced ulna fracture is a Monteggia until proven otherwise - always image the elbow
COMMON PITFALLS
Not checking the radiocapitellar line carefully on the lateral view (normal-looking AP but dislocated lateral)
Accepting inadequate ulna reduction, leaving persistent radial head subluxation
Missing PIN palsy in Type II (test finger and thumb extension pre- and post-op)
In children, confusing acute injury with congenital radial head dislocation (bilateral, dome-shaped capitellum, no trauma)
FURTHER QUESTIONS
"What is the Bado classification and which type is commonest in adults?"
"Which nerve is at risk in Type II Monteggia and how do you test it?"
"How would you manage a chronic Monteggia presenting 6 months after injury?"
CLINICAL SCENARIOChallenging
Scenario 2: Galeazzi Fracture - ORIF and DRUJ Assessment
CLINICAL PROMPT
"A 28-year-old professional gymnast falls on her outstretched hand during training. She has pain at the wrist and distal forearm. X-rays show a fracture of the distal radius at the junction of the middle and distal thirds with dorsal angulation. You also notice the DRUJ appears widened compared to the contralateral side (3mm vs 1mm), and there is a small ulnar styloid fracture. The emergency department doctor asks if this can be treated in a cast. What is your diagnosis and management plan?"
PRACTICAL APPROACH
This is a **Galeazzi fracture-dislocation** - a distal-third radius fracture with **DRUJ disruption** - classically the **'fracture of necessity'** because conservative treatment fails in roughly 80% of adults (Mikic, JBJS Am 1975), so adults require surgery. **Diagnosis**: radius fracture at the mid/distal third junction plus DRUJ disruption shown by DRUJ widening over 2mm versus contralateral (3mm here), an ulnar styloid (base) fracture suggesting foveal TFCC avulsion, and a prominent ulna head clinically. **Pathoanatomy**: the DRUJ is stabilised by the TFCC (dorsal/palmar radioulnar ligaments and disc), IOM and pronator quadratus; radial shortening/angulation from the fracture unloads these and allows DRUJ subluxation. The Rettig-Raskin classification is useful: fractures **within 7.5cm** of the distal radius articular surface (type I) are far more likely to be DRUJ-unstable after fixation than those over 7.5cm (type II). **Surgical management**: Step 1 - **ORIF of the radius** via the volar Henry approach (interval between brachioradialis/radial nerve and FCR/median nerve, protecting the radial artery) using a 3.5mm or anatomic plate; the priority is restoring **radial length**, bow and rotation, because residual shortening perpetuates DRUJ instability. Step 2 - **intraoperatively test DRUJ stability**: stress the ulna head dorsally and volarly in neutral, pronation and supination and compare with the other side; gross laxity or over 50% translation is unstable, and supination is the most stable position. Step 3A - if **stable**, no further fixation and early ROM. Step 3B - if **unstable**, options are above-elbow immobilisation in supination for ~6 weeks, K-wire transfixation of the reduced DRUJ (2 × 1.6mm, removed at ~6 weeks), TFCC repair for an accessible foveal/peripheral tear, or ulnar styloid base ORIF for a large foveal fragment. **Answer to the ED doctor**: this is a fracture of necessity - casting fails in ~80% of adults, causing malunion, radial shortening and chronic DRUJ instability, so surgical fixation is mandatory. **Complications**: persistent DRUJ instability, malunion with ulnocarpal impaction, and stiffness if motion is delayed unnecessarily.
KEY CLINICAL POINTS
Galeazzi = 'fracture of necessity' - ~80% conservative failure in adults (Mikic 1975); operate
Distal-third radius fracture + DRUJ disruption (widening over 2mm, ulnar styloid base fracture, prominent ulna head)
ORIF radius via volar Henry - restoring radial length is the key to DRUJ stability
Test the DRUJ intraoperatively in neutral/pronation/supination after fixing the radius; supination is most stable
Rettig-Raskin: fractures within 7.5cm of the joint are much more likely to need DRUJ stabilisation
COMMON PITFALLS
Not testing DRUJ stability intraoperatively after radial fixation (must check before closing)
Failing to restore radial length (residual shortening perpetuates DRUJ instability)
Ignoring an ulnar styloid base fracture indicating foveal TFCC avulsion
Telling the ED this can be treated conservatively in an adult (fracture of necessity)
FURTHER QUESTIONS
"What are the radiographic signs of DRUJ disruption on standard X-rays?"
"How would you manage chronic DRUJ instability presenting 6 months after a Galeazzi injury?"
"What is the Essex-Lopresti lesion and how does it differ from a Galeazzi fracture?"
CLINICAL SCENARIOCritical
Scenario 3: Missed Monteggia - Chronic Radial Head Dislocation
CLINICAL PROMPT
"You are asked to see a 12-year-old boy referred by his GP for a 'funny elbow'. He fell from monkey bars 8 months ago and was treated in a cast for an 'ulna fracture' at another hospital. Since the cast came off he has progressive elbow pain and cannot fully extend or supinate. Examination shows a prominent radial head laterally. X-rays show a healed ulna fracture with residual anterior angulation, and the radial head is dislocated anteriorly/laterally with a flattened, dome-shaped capitellum. What has happened and how do you manage this?"
PRACTICAL APPROACH
This is a **missed Monteggia** with **chronic radial head dislocation** - one of the most significant medico-legal complications in orthopaedic trauma. The original injury was a Monteggia (ulna fracture with radial head dislocation); the radial head dislocation was not recognised, the ulna healed in malunion (anterior angulation), and over 8 months chronic changes have developed. **Why these are missed**: up to half initially, usually because the **radiocapitellar line was not checked** on the lateral elbow film; the AP can look normal, attention fixes on the obvious ulna fracture, and dedicated elbow views may not be obtained. **Chronic pathological changes**: radial head deformity/elongation, capitellar flattening (dome-shaped, as here), annular ligament scarring/contracture, capsular contracture, and ulnar malunion - so the radial head will not stay reduced by closed means. **Management** depends on time since injury and age; at 8 months in a 12-year-old, reconstruction is reasonable. Reconstruction: (1) **ulnar osteotomy** at the malunion to restore length and correct the anterior angulation - the deformity that displaces the radial head - and fix it; (2) **open reduction of the radial head** via a lateral approach, excising interposed scar; (3) stabilisation - historically with **annular ligament reconstruction** (Bell-Tawse-type, using triceps fascia/palmaris), although Chen et al (Int Orthop 2018) maintained reduction in 18 of 20 children with osteotomy and open reduction **without** annular ligament reconstruction, sometimes with a temporary trans-capitellar K-wire for an unstable reduction. **Outcomes are better when surgery is within one year** of injury (Chen 2018); this patient falls within that window. **Alternative**: observation in late/minimally symptomatic presentations, accepting some permanent loss of terminal extension and supination, with possible radial head excision deferred to skeletal maturity if very symptomatic - excision in a child risks loss of longitudinal support. **What should have happened**: check the radiocapitellar line on the lateral view; any isolated displaced ulna fracture is a Monteggia until proven otherwise; acute ulna ORIF reduces the radial head in the great majority with good results. **Counselling**: explain the missed diagnosis, the guarded prognosis with likely residual stiffness, the better odds because he is within a year, and involve the family in shared decision-making; document meticulously.
KEY CLINICAL POINTS
Missed Monteggia is a medico-legal disaster - up to 50% missed by not checking the radiocapitellar line on the lateral view
Chronic dislocation develops radial head deformity, capitellar flattening and annular ligament scarring - closed reduction fails
Reconstruction centres on ulnar osteotomy to correct the malunion, plus open radial head reduction (+/- annular ligament reconstruction)
Outcomes are better when surgery is within one year of injury (Chen 2018); annular ligament reconstruction may not be essential
Prevention: 'any isolated ulna fracture is a Monteggia until proven otherwise' - image the elbow and check the radiocapitellar line
COMMON PITFALLS
Attempting closed reduction without correcting the ulnar malunion (will fail - fix the primary bony deformity first)
Not counselling the family about the guarded prognosis and the missed-diagnosis implications
Reconstruction in very late presentation (over 1 year) where results are poorer - consider observation
Radial head excision in a child (loss of longitudinal support - defer until skeletal maturity unless severe symptoms)
FURTHER QUESTIONS
"Describe the Bell-Tawse technique for annular ligament reconstruction"
"What is the radiocapitellar line and why is it critical in diagnosing Monteggia?"
"At what timing threshold would you favour observation over reconstruction for chronic Monteggia?"
MCQ Practice Points
Clinical Pearl
Q: What is the Bado classification of Monteggia fractures?
A: Type I: anterior radial head dislocation, anterior ulna angulation (commonest overall). Type II: posterior dislocation, posterior angulation (commonest in adults, PIN risk). Type III: lateral dislocation, metaphyseal ulna fracture (paediatric). Type IV: anterior dislocation with both-bone proximal-third fractures. All require radiocapitellar line assessment.
Clinical Pearl
Q: What radiographic line must be checked to diagnose a Monteggia lesion?
A: The radiocapitellar line - drawn along the radial neck/shaft axis it should pass through the capitellum on all views (AP, lateral, oblique). Disruption indicates radial head dislocation. "Any isolated ulna fracture is a Monteggia until proven otherwise" - always obtain elbow views. Missed in up to 50% initially.
Clinical Pearl
Q: What defines a Galeazzi fracture-dislocation?
A: Distal radius fracture with DRUJ disruption. Called the "fracture of necessity" - requires surgery in adults. DRUJ instability arises from a disrupted TFCC and loss of radial length. Signs: ulnar fovea tenderness, DRUJ widening on PA view, ulnar styloid base fracture, and instability on stress testing.
Clinical Pearl
Q: What is the Essex-Lopresti injury?
A: Radial head fracture + interosseous membrane disruption + DRUJ instability (longitudinal radioulnar dissociation). If the radial head is excised, the radius migrates proximally causing wrist pain and weakness. Treat with radial head replacement (not excision) and protect/reconstruct the IOM.
Clinical Pearl
Q: Why is anatomic ulna reduction critical in Monteggia treatment?
A: Anatomic ulna reduction restores length and IOM tension so the radial head usually reduces spontaneously. Persistent dislocation after ulna fixation suggests interposed tissue (annular ligament/capsule) requiring open reduction. In children, anatomic closed reduction is often sufficient; adults typically need ORIF of the ulna.
Guidelines, Registries & Global Practice
OrthoVellum is a global resource - the principles below hold across exam systems (FRCS, FRACS, EBOT/FEBOT, ABOS, DNB/MS, MRCS, SICOT).
Global epidemiology:
- Monteggia lesions: ~1-2% of forearm fractures; paediatric peak (Type I/III) and adult peak (Type II, higher-energy).
- Galeazzi: ~3-7% of forearm fractures; adults 30-50, often occupational/sport.
Side-by-side guidance and consensus (recommendations are broadly concordant):
| Body | Position on these injuries |
|---|---|
| AO Foundation | Anatomic ORIF of the fractured bone with plate fixation; restore length/alignment so the joint reduces; assess and address the associated joint |
| BOA / BOAST (UK) | Adult diaphyseal forearm and forearm fracture-dislocations managed operatively with timely imaging of the whole forearm including both joints |
| AAOS (US) | No injury-specific clinical practice guideline; teaching follows the ring-concept and anatomic fixation principles above |
| EFORT / European consensus | Endorses anatomic radial/ulnar fixation and intraoperative joint (radial head / DRUJ) assessment |
Registry note: Acute forearm fracture-dislocation fixation is not captured in arthroplasty registries (NJR, AJRR, AOANJRR), as these injuries are managed with osteosynthesis rather than implants; the evidence base is case series and classification studies rather than registry or RCT data.
High- vs limited-resource practice variation:
- Well-resourced settings: routine CT for complex Bado II, locking plates, intraoperative fluoroscopic DRUJ stress testing, radial head arthroplasty available for Essex-Lopresti.
- Limited-resource settings: greater reliance on plain radiographs and contralateral comparison, conventional DCP fixation, K-wire DRUJ transfixation and supination casting; the same anatomic-reduction principles still govern outcome.
- Universal priority everywhere: image the whole forearm and both joints and check the radiocapitellar line - the diagnostic miss, not the implant, is the main cause of poor outcomes.
Monteggia and Galeazzi Quick Reference
Clinical summary
Monteggia
- •Proximal ulna fracture + radial head dislocation
- •Bado I anterior (commonest overall); Type II posterior commonest in adults (PIN risk)
- •Fix ulna anatomically and the radial head reduces
- •Check radiocapitellar line on all views
Galeazzi
- •Distal radius fracture + DRUJ disruption
- •Fracture of necessity - operate in adults (~80% conservative failure)
- •ORIF radius, restore length, then assess DRUJ stability
- •Supination is the stable position for the DRUJ
Ring Concept
- •Forearm = ring (PRUJ + IOM + DRUJ)
- •If one bone fractured + displaced...
- •...there must be disruption elsewhere
- •Always X-ray entire forearm + both joints
Key Complications
- •Missed diagnosis (especially Monteggia)
- •Persistent joint instability
- •Malunion affecting rotation
- •PIN palsy (Monteggia Type II)