Rolando's Fractures

Rolando's fracture, first described by Silvio Rolando in 1910, is a comminuted intra-articular fracture of the first metacarpal base involving the carpometacarpal (CMC) joint. It has three or more fragments, typically in a Y-shaped or T-shaped pattern, and represents approximately 15-20% of thumb metacarpal base fractures.

Rolando or Bennett. The distinction is a classic exam comparison, and it turns on the number of fragments. Bennett's is a two-part fracture-subluxation: the volar-ulnar fragment stays in place because the anterior oblique ligament is intact, the shaft subluxates dorsally under the pull of abductor pollicis longus, and the prognosis is generally good if it is reduced. Rolando's is comminuted, with more articular damage and impaction, and has a worse prognosis despite treatment.

Why the prognosis is guarded. The comminution means greater disruption of the articular surface, and the cartilage damage is sustained at the time of injury. Post-traumatic arthritis is therefore more common than after Bennett's despite optimal treatment, and even an anatomic reduction leaves the prognosis guarded. The comminuted pattern also makes surgical reconstruction challenging.

The joint. The anatomy of the thumb CMC joint is identical to that described for Bennett's fractures; what matters for Rolando's is how the joint is loaded. It is a saddle-shaped (biconcave-biconvex) articulation that allows flexion-extension, abduction-adduction and opposition, under high functional demands in pinch and grip. The articular cartilage is approximately 1-2mm thick, and 40% of hand function depends on the thumb.

The ligaments. The stabilisers of the joint fare differently when the base breaks into several pieces:

The vessels. The princeps pollicis artery, from the radial artery, and the first dorsal metacarpal artery supply the region, and both are at risk during the surgical approach.

Mechanism. A high-energy axial load on a partially flexed thumb drives the metacarpal into the trapezium. The force is greater than in a Bennett's fracture, and it exceeds what the articular surface can tolerate, so the base comminutes. It happens in:

• Punching, often a missed punch
• A fall onto the extended thumb
• Sporting injuries, such as skiing and contact sports
• Motor vehicle accidents

Deforming forces. They are the same as in Bennett's. Abductor pollicis longus inserts on the dorsal base of the first metacarpal and is the major deforming force, pulling the shaft proximally, radially and dorsally. Adductor pollicis pulls the shaft ulnarly and contributes to shortening, and EPL and EPB add an extension and radial deviation force.

The classification is morphological; CT then determines fragment size, impaction and reconstructability. The Y-shaped pattern with large fragments offers the best opportunity for anatomic reconstruction; comminuted patterns favour fixation that relies on ligamentotaxis.

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Rolando PatternComprehensiveFragment Size

• Y-shaped (three-part) - the most common pattern. A volar-ulnar fragment (as in Bennett's), a dorsal-radial fragment and the metacarpal shaft, which may subluxate. It is amenable to ORIF if the fragments are an adequate size.
• T-shaped - a transverse articular split with a vertical fracture into the shaft. The fixation principles are similar.
• Comminuted - multiple small articular fragments, often with central impaction. The most challenging pattern, and it may require external fixation.

Across all thumb metacarpal base fractures, prognosis worsens as the joint is involved and then fragmented:

Extra-articular

Pattern

Does not involve CMC joint

Prognosis

Best

Bennett's

Pattern

2-part intra-articular

Prognosis

Good

Rolando's

Pattern

3+ part comminuted

Prognosis

Fair

Severely Comminuted

Pattern

Multiple small fragments

Prognosis

Poor

Type	Pattern	Prognosis
Extra-articular	Does not involve CMC joint	Best
Bennett's	2-part intra-articular	Good
Rolando's	3+ part comminuted	Fair
Severely Comminuted	Multiple small fragments	Poor

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Gedda - Bennett patterns only. Gedda's 1954 monograph classified the Bennett fracture, not the thumb base as a whole. All three types share the volar-ulnar fragment tethered by the anterior oblique ligament, and differ in impaction and in how far the metacarpal has escaped. There is no Gedda type for a comminuted Rolando pattern.

Type I

Description

Single large volar-ulnar fragment with subluxation of the metacarpal

Type II

Description

Impaction fracture without subluxation

Type III

Description

Small volar-ulnar avulsion fragment with frank dislocation of the metacarpal

Type	Description
Type I	Single large volar-ulnar fragment with subluxation of the metacarpal
Type II	Impaction fracture without subluxation
Type III	Small volar-ulnar avulsion fragment with frank dislocation of the metacarpal

Green and O'Brien - all thumb base fractures. Green and O'Brien (South Med J 1972) is the scheme that covers every thumb metacarpal base fracture and gives Rolando's fracture a numbered place: Rolando's is Type II.

Type I

Description

Bennett's - two-part intra-articular fracture-subluxation

Type II

Description

Rolando's - comminuted intra-articular, Y or T pattern

Type IIIA

Description

Extra-articular transverse

Type IIIB

Description

Extra-articular oblique

Type IV

Description

Epiphyseal (paediatric)

Type	Description
Type I	Bennett's - two-part intra-articular fracture-subluxation
Type II	Rolando's - comminuted intra-articular, Y or T pattern
Type IIIA	Extra-articular transverse
Type IIIB	Extra-articular oblique
Type IV	Epiphyseal (paediatric)

Fragment size directly determines the fixation strategy and the expected outcome. Plate fixation is appropriate only when the fragments are large enough to accept screws without further fragmentation.

• Large, greater than 25% of the articular surface - amenable to screw fixation, and a lag screw technique can be considered. Better reduction is possible.
• Medium, 10-25% - K-wire fixation, possibly small screws, and indirect reduction techniques.
• Small, less than 10% - difficult to fix individually. These rely on ligamentotaxis, and external fixation is preferred.

History. The injury is of higher energy than a typical Bennett's. The patient has severe pain and significant swelling at the thumb base and cannot use the thumb; there may be obvious deformity, and some describe a "crunching" at the moment of injury.

Examination. Marked swelling at the thenar eminence, with ecchymosis extending into the palm. The thumb appears shortened and may be angulated, and the skin must be checked for an open fracture. The CMC joint is exquisitely tender, and gentle manipulation produces crepitus.

Neurovascular and associated injuries. Record digital sensation on both the radial and ulnar sides of the thumb, capillary refill, and the radial artery pulse at the snuffbox. Look for other metacarpal fractures, carpal bone injuries and ligamentous injuries.

Telling it from Bennett's. The higher energy shows in the examination and on the film:

Radiographs. Four views:

1. PA - shows the Y or T pattern
2. True lateral - assesses subluxation
3. Roberts view - a hyperpronated AP of the thumb
4. Obliques - additional fragment detail

Expect multiple fracture lines through the articular surface in a Y-shaped or T-shaped configuration, shortening of the metacarpal shaft, and widening or subluxation of the CMC joint; central impaction may be visible. Read the frontal and lateral films together, because subluxation and dorsal displacement can be incompletely characterised on the AP view, and loss of joint congruity drives treatment even when individual articular fragments overlap.

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Getting the true lateral. Pronate the hand approximately 20 degrees, then angle the beam 15-20 degrees distally to separate the thumb metacarpal base from the other metacarpals. A poorly positioned lateral can conceal CMC subluxation and articular step-off.

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CT. Essential for surgical planning, and indicated in every Rolando's fracture being considered for surgery. Document:

• Number of fragments
• Size of each fragment
• Degree of articular impaction
• Metaphyseal bone loss
• Fragment displacement

3D reconstruction shows the fracture pattern and the orientation of each fragment, which plans the approach, guides implant selection and determines whether ORIF is feasible or whether external fixation or arthroplasty should be considered.

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MRI is rarely indicated and is not routine for the acute fracture. It assesses associated ligament injury and may help assess chronic instability.

The treatment goals:

1. Anatomic articular reduction when possible
2. Stable fixation allowing early motion
3. Restore thumb length and alignment
4. Preserve CMC joint motion
5. Minimise post-traumatic arthritis

Algorithm

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Malreduction. The most significant early complication: an articular step leads to arthritis, and revision surgery may be required.

Loss of reduction. Common without stable fixation, which is why close radiographic follow-up is essential; it too may need revision.

Infection. Pin-site infection occurs in 5-10% of external fixators; deep infection is rare after ORIF. Treat early and consider hardware removal.

Hardware failure. Small screws may strip, K-wires may migrate, and a plate can loosen.

Post-traumatic arthritis. The most significant long-term complication, at a rate higher than after Bennett's. It occurs even with anatomic reduction, because the cartilage is damaged at the time of injury, and it may require CMC arthrodesis.

Stiffness. Common, especially after prolonged immobilisation, and it may limit opposition and grip. Hand therapy is essential, and some patients need a capsular release.

Chronic instability. Follows the ligament damage and may contribute to arthritis. Ligament reconstruction is rarely successful.

Malunion. The result of inadequate reduction. It alters the mechanics of the thumb and accelerates degenerative change.

Weakness. Pinch and grip strength are reduced. The weakness usually improves over 12 months but may be permanent.

Compared with Bennett's:

Immobilisation. A thumb spica splint initially, converted to a removable splint at 2-4 weeks if the fixation is stable. K-wires come out at 4-6 weeks, and an external fixator typically stays for 6 weeks.

Pin-site care for the external fixator:

• Daily cleaning with normal saline
• Monitor for signs of infection
• No submersion in water
• Educate the patient on the warning signs

Rehabilitation. Hand therapy supervision is essential for optimal functional recovery:

• Weeks 0-2, protection: strict immobilisation, elevation and oedema control, motion of the unaffected fingers
• Weeks 2-4: gentle active motion if the fixation is stable; continue the splint if stability is borderline
• Weeks 4-6: progressive range-of-motion exercises
• Weeks 6-12, strengthening: progressive strengthening, putty exercises for pinch and grip, functional activities, scar mobilisation
• Week 12 onwards: full activity as tolerated and sport-specific conditioning; therapy may need to be prolonged

Return to work and sport. It depends on healing, strength recovery and the functional demands, and recovery typically takes longer than after Bennett's. Some stiffness often persists, and there may be weather-related discomfort.

Prognostic factors. A good result is more likely with:

• Y-shaped pattern rather than a highly comminuted one
• Anatomic reduction achieved
• Large fragments amenable to fixation
• Young patient
• Early surgical treatment
• Compliance with rehabilitation

and less likely with:

• Highly comminuted pattern
• Central articular impaction
• Multiple small fragments
• Cartilage damage visible at surgery
• Delayed treatment
• Open fracture
• Associated soft-tissue injury

By pattern. The Y-shaped (three-part) fracture achieves 60-70% good or excellent results, but anatomic reduction is critical and early arthritis develops in 30-40%. The comminuted pattern achieves 40-50% satisfactory results; some articular incongruity should be expected, and the rate of eventual fusion is higher.

Strength and motion. Grip recovers to 70-80% of the other side at 1 year and may continue to improve to 2 years, but rarely returns to 100%. Pinch is more affected, at 60-75% of the other side, which impacts fine motor tasks. Loss of motion is variable: opposition is usually preserved, though terminal extension or flexion may be lost.

Long-term follow-up. Annual radiographs for 5 years to monitor arthritis progression, with assessment of functional limitations and of the timing of any salvage procedure.

Salvage. The indications:

• Symptomatic post-traumatic arthritis
• Failed conservative measures
• Limitation of function and quality of life

The options:

• CMC arthrodesis - the most common
• Trapezium excision arthroplasty
• Total joint arthroplasty - a limited role

Guidelines, Registries & Global Practice

Thumb metacarpal base fractures are uncommon but functionally important. Metacarpal and phalangeal fractures together account for a large share of all hand fractures, yet the thumb accounts for only a small minority of tubular-bone hand fractures in large epidemiological series. Stanton, Dias and Burke reviewed 701 such fractures: the thumb was rarely involved in children and young adults, although thumb involvement rose among patients over 65 (a group in which 40% were injured on the road and fractures were more often oblique, intra-articular or multiple), and only 10% of the 70 intra-articular fractures were completely undisplaced. Rolando fractures are the comminuted, three-or-more-fragment subset of intra-articular thumb base fractures and are the least common but most difficult of the recognised patterns.

Global Epidemiology

Guideline & Consensus Positions (Side by Side)

No single national society publishes a Rolando-specific guideline; recommendations are drawn from AO Foundation principles, society reviews, and trauma standards. The recommendations converge internationally.

Registry & Comparative Evidence

There is no dedicated joint registry for thumb-base fractures (registries cover arthroplasty, not fracture fixation). The strongest comparative evidence is therefore from cohort series:

• Reduction quality, not implant choice, drives outcome. In Bennett fractures, ORIF and closed transarticular pinning gave equivalent clinical and radiographic results at a mean 7-year follow-up (Lutz et al.) — the principle generalises to Rolando fixation selection.
• Ligamentotaxis works for comminution. Dynamic external fixation restored joint space and motion in small Rolando series (El-Sharkawy et al.).
• Salvage is reliable. Trapeziometacarpal arthrodesis achieves ~96% fusion with improved pinch/grip in the post-traumatic setting (Talsania et al.).

Practice Variation

• High-resource settings: routine CT/3D planning, locking mini-fragment systems, and arthroscopic-assisted reduction in selected centres.
• Limited-resource settings: closed reduction with percutaneous K-wire or simple external fixation predominates; outcomes remain acceptable where length and alignment are restored.
• Threshold for surgery is broadly consistent worldwide (articular step greater than 1-2mm, instability, or displacement), reflecting shared AO-derived principles rather than divergent national policy.

Viva Scenarios

MCQ Practice Points

Exam Day Cheat Sheet

Quick Reference: Key Numbers

Bennett's vs Rolando's Summary

Evidence Base