Views: 0 Author: Site Editor Publish Time: 2026-09-19 Origin: Site
Introduction
The thumb plays a critical role in hand function, contributing substantially to pinch, grasp, opposition, and fine motor control. Because of its unique anatomy and mobility, fractures and fracture-dislocations of the thumb can have a disproportionate effect on overall hand function.
Thumb injuries can involve the:
Distal phalanx
Proximal phalanx
Metacarpophalangeal (MCP) joint
First metacarpal
Thumb carpometacarpal (CMC) joint
Ulnar or radial collateral ligaments
Common fracture patterns include distal phalanx fractures, bony mallet injuries, proximal phalanx fractures, first metacarpal fractures, Bennett fractures, and Rolando fractures.
Treatment must be individualized according to fracture location, displacement, articular involvement, instability, soft-tissue injury, and the patient's functional requirements. Stable and minimally displaced fractures can often be treated without surgery, whereas displaced intra-articular fractures, unstable fractures, fracture-dislocations, and selected avulsion injuries may require surgical fixation.
For surgeons, the primary objectives of thumb fracture fixation are to:
Restore anatomical alignment
Reconstruct the articular surface
Maintain thumb length and rotation
Restore joint stability
Minimize soft-tissue damage
Allow appropriate early motion when fixation stability permits
This article summarizes 11 commonly used fixation techniques and surgical strategies for thumb fractures, including K-wire fixation, hook plate fixation, screw fixation, plate fixation, and percutaneous fixation of Bennett and Rolando fractures.
Accurate intraoperative fluoroscopy is essential when treating fractures involving the thumb carpometacarpal (CMC) joint, particularly Bennett and Rolando fractures.
One of the most useful radiographic projections is the Robert's view, a true AP projection of the thumb CMC joint.
To obtain a Robert's view, the hand is hyperpronated so that the dorsal surface of the thumb rests against the image receptor. This positioning allows the first metacarpal base and trapeziometacarpal joint to be visualized with minimal overlap.
This view is particularly useful for evaluating:
First metacarpal base fractures
Bennett fractures
Rolando fractures
CMC joint congruity
Residual articular displacement
Postoperative implant position
Additional oblique and lateral projections may be necessary depending on the fracture pattern.
For complex intra-articular fractures, CT imaging can provide more detailed information about the number and orientation of fracture fragments and can assist with preoperative planning.
The thumb CMC joint has a highly mobile saddle-shaped configuration. Even relatively small articular incongruities can be clinically relevant in an unstable fracture-dislocation.
Therefore, intraoperative fluoroscopy should not be limited to confirming implant position. It should also be used to evaluate:
Articular congruity
Metacarpal alignment
CMC joint reduction
Fracture fragment position
A transverse fracture of the thumb distal phalanx can sometimes be stabilized using two parallel Kirschner wires (K-wires).
For selected unstable fractures, the K-wires can be inserted longitudinally along the distal phalanx, positioned close to the nail plate while remaining within the bony structure.
The wires are advanced toward the base of the distal phalanx to maintain alignment.
Before definitive fixation, the surgeon should assess:
Fracture reduction
Rotation
Length
Nail-bed condition
Joint involvement
K-wire trajectory
Fluoroscopy should confirm that the wires remain within the distal phalanx and do not enter the interphalangeal joint unless transarticular stabilization is specifically intended.
Distal phalanx fractures can be associated with nail-bed injury.
If the fracture is open or associated with significant nail-bed disruption, management should include appropriate wound assessment, irrigation and debridement when indicated, and restoration of the nail-bed anatomy.
In pediatric patients, fractures near the physis require particular attention because Seymour-type injuries are open injuries that may require urgent operative management.
Highly comminuted distal phalanx fractures present a different challenge because the small fracture fragments may provide limited purchase for conventional screws.
When surgical fixation is required, treatment begins with careful assessment of the nail plate and nail bed.
The nail plate can be temporarily removed when necessary to allow adequate inspection and repair of the underlying nail-bed injury.
The fracture fragments are then reduced as much as possible while preserving soft-tissue attachments.
K-wires can be used to stabilize the reconstructed distal phalanx.
The fixation strategy should prioritize:
Restoration of the overall shape and length of the distal phalanx
Protection of the nail bed
Preservation of viable fracture fragments
Avoidance of unnecessary joint penetration
Stable fixation sufficient for soft-tissue healing
In severely comminuted fractures, anatomical reconstruction of every tiny fragment may not be possible or necessary.
The surgeon should instead focus on restoring the structural integrity of the distal phalanx while minimizing additional tissue trauma.
A bony mallet injury of the thumb involves an avulsion or intra-articular fracture of the distal phalanx at the insertion of the terminal extensor mechanism at the thumb interphalangeal (IP) joint.
Although mallet injuries are much more commonly discussed in the fingers, similar fracture-dislocation patterns can occur in the thumb.
Many nondisplaced or stable mallet injuries can be managed conservatively with extension splinting.
Surgical treatment may be considered when there is:
Significant articular involvement
Persistent joint subluxation
Unstable fracture displacement
Open injury
Failure of conservative management
Current evidence supports nonoperative treatment for many stable mallet fractures, while fractures associated with IP joint subluxation or substantial articular involvement may require surgical referral.
For selected unstable bony mallet injuries, a dorsal approach can be used to expose the fracture.
A small hook plate combined with a screw can capture the distal fracture fragment.
Hook plates are particularly useful when the fragment is too small to accept a conventional screw safely.
Published clinical reports describe hook plate fixation as one option for small fracture-avulsion fragments, although implant prominence and soft-tissue irritation remain potential complications.
Alternative techniques include:
Extension-block pinning
Transarticular K-wire fixation
Mini-screw fixation
Suture-based fixation
The choice depends on fragment size, joint stability, fracture displacement, and surgeon experience.
A fracture involving the volar margin of the thumb distal phalanx may be associated with subluxation of the interphalangeal joint.
These injuries can compromise joint congruity and may require surgical reduction when the joint cannot be maintained in a stable position.
After reduction, two K-wires may be used to maintain the fracture and joint alignment.
Depending on the fracture pattern, fixation may include:
Direct fragment fixation
Temporary transarticular K-wire stabilization
Extension-block or alignment pinning
Screw fixation in sufficiently large fragments
The primary objective is to restore a congruent IP joint and prevent recurrent subluxation.
Fluoroscopy should be used in multiple planes to verify:
Joint congruity
Fracture reduction
K-wire position
Absence of intra-articular hardware penetration
Bicondylar fractures of the proximal phalanx are complex injuries because the fracture can involve both sides of the articular surface.
The goals of treatment are to restore:
The proximal phalanx head
MCP joint congruity
Coronal alignment
Rotation
Condylar width
For displaced bicondylar fractures, open reduction and internal fixation (ORIF) may be necessary.
Depending on fragment size, multiple small screws can be used to reconstruct the two condyles.
The surgeon should first identify the major articular fragments.
After anatomical reduction, provisional fixation with K-wires can maintain the reduction.
Small-diameter screws can then be inserted to obtain stable fixation.
Because excessive dissection around the phalangeal condyles may compromise soft-tissue structures and contribute to stiffness, the surgical exposure should be as limited as necessary to achieve reduction.
Rigid fixation can permit earlier controlled motion than unstable fixation, although rehabilitation must always be individualized according to fracture stability and soft-tissue healing.
One important thumb injury is an avulsion fracture at the base of the proximal phalanx involving the ulnar collateral ligament (UCL) of the MCP joint.
This injury is commonly associated with forced thumb abduction and radial deviation and is often referred to clinically as a skier's thumb or gamekeeper's thumb depending on the mechanism and chronicity.
The avulsed fragment may be small.
When the fragment is displaced or rotated, direct fixation may be necessary.
A small hook plate can capture the avulsed fragment while a screw secures the plate to the adjacent intact bone.
The hook portion of the plate engages the small fracture fragment, allowing reduction and fixation even when the fragment is too small for conventional screw fixation.
A typical sequence is:
Expose the UCL avulsion fracture.
Identify and protect nearby neurovascular structures.
Mobilize the fracture fragment.
Reduce the fragment anatomically.
Place the hook portion of the plate over the fragment.
Secure the plate with an appropriate screw.
Confirm reduction with fluoroscopy.
Assess MCP joint stability.
Hook plate fixation has been described as a stable option for small UCL fracture-avulsion fragments. However, implant prominence can occasionally cause local irritation, particularly during thumb pinch and gripping.
Extra-articular fractures near the proximal first metacarpal can often be managed according to fracture stability and displacement.
For a stable fracture after closed reduction, percutaneous K-wire fixation can provide adequate stabilization.
When the fracture is unstable, significantly displaced, or cannot be maintained after closed reduction, ORIF with a plate may be considered.
Closed reduction generally involves correcting:
Angulation
Translation
Rotation
Metacarpal shortening
Once satisfactory alignment is obtained, one or more K-wires can be inserted to maintain the reduction.
Intermetacarpal fixation may be used in selected fracture patterns.
For unstable transverse or oblique fractures, a low-profile locking plate can provide more rigid fixation.
Plate fixation may be particularly useful when:
Closed reduction fails
The fracture is unstable
There is significant displacement
Early controlled motion is desirable
The fracture configuration permits reliable screw purchase
K-wires remain widely used in hand fracture fixation because they are relatively simple and minimally invasive, although they generally provide less rigid fixation and may require longer immobilization than some plate or screw constructs.
Fractures involving the first metacarpal head may extend into the MCP joint and require accurate restoration of the articular surface.
A dorsal approach can provide access to the metacarpal head.
The extensor mechanism is carefully mobilized to expose the fracture.
Depending on the fracture configuration, a headless compression screw can provide interfragmentary compression while minimizing hardware prominence.
The advantages of a headless compression screw include:
Compression across the fracture
Low-profile fixation
No prominent screw head
Potentially reduced tendon irritation
Stable fixation of selected intra-articular fragments
The screw trajectory should be planned carefully to avoid entering the joint or interfering with the extensor mechanism.
Fluoroscopy should confirm both fracture reduction and implant position.
For intra-articular thumb fractures, restoration of joint congruity is particularly important because persistent incongruity can contribute to stiffness and post-traumatic degenerative changes.
A Bennett fracture is an intra-articular fracture-subluxation of the base of the first metacarpal involving the thumb CMC joint.
The characteristic fracture consists of a relatively small volar-ulnar fragment that remains associated with the trapezium, while the larger metacarpal fragment tends to displace dorsoradially under muscular forces.
Because the thumb CMC joint is highly mobile, maintaining reduction can be challenging.
Closed reduction generally involves:
Longitudinal traction
Thumb abduction
Correction of metacarpal adduction
Pronation of the metacarpal as needed
Direct pressure over the metacarpal base
Fluoroscopy is used to confirm reduction.
Once reduction has been achieved, two K-wires can be used to stabilize the fracture.
Depending on the fracture morphology, the wires may be directed:
Across the fracture
From the first metacarpal toward the trapezium
Between the first and second metacarpals
The fixation strategy should provide sufficient stability while avoiding unnecessary damage to the CMC joint.
Percutaneous fixation remains an important treatment option for unstable Bennett fractures. Evidence comparing closed reduction/percutaneous fixation with ORIF has not established one technique as universally superior, although ORIF may carry a higher complication burden in some comparative analyses.
A second K-wire can improve rotational stability and reduce the risk of secondary displacement compared with an isolated pin construct in selected fracture patterns.
The final reduction should be assessed with AP/Robert's, lateral, and oblique fluoroscopic views.
A Rolando fracture is a comminuted intra-articular fracture of the base of the first metacarpal.
The classic pattern is often described as a Y-shaped or T-shaped fracture, although the term is also commonly used more broadly for comminuted intra-articular fractures of the thumb metacarpal base.
Compared with Bennett fractures, Rolando fractures are usually more difficult to reduce and maintain because the articular surface is divided into multiple fragments.
The primary objectives are to:
Restore the CMC joint surface
Restore first metacarpal length
Correct angular and rotational deformity
Maintain thumb alignment
Minimize post-traumatic joint incongruity
For selected fractures with relatively large, controllable fragments, closed reduction may be attempted.
A typical reduction maneuver includes:
Longitudinal traction
Thumb abduction
Pronation
Correction of metacarpal displacement
Once the fracture is reduced, K-wires can be used for provisional or definitive fixation.
However, highly comminuted fractures may not remain stable with K-wires alone.
When the volar and dorsal articular fragments are sufficiently large, ORIF can provide direct visualization and anatomical reconstruction.
A dorsal or Wagner-type approach may be used depending on the fracture configuration and planned implant.
After longitudinal traction is applied, the major articular fragments are reduced using appropriate reduction clamps.
K-wires can be used for provisional fixation.
Definitive fixation may then be achieved using:
Lag screws
Mini-plates
T-plates
Locking plates
Combination screw-and-plate constructs
The exact implant should be selected according to fragment size and bone stock.
For complex Rolando fractures, a small locking plate can help maintain the reconstructed articular block while limiting secondary displacement.
Published reviews describe ORIF as an option for fractures with sufficiently large volar and dorsal fragments, while external fixation or percutaneous techniques may be considered when the fragments are too small or the fracture is highly comminuted.
The fixation method should not be selected solely according to the fracture name.
Instead, the surgeon should evaluate several factors.
Intra-articular fractures require particular attention to joint congruity.
This is especially important for:
Bennett fractures
Rolando fractures
Metacarpal head fractures
Bony mallet injuries
Stable fractures may be treated with immobilization.
Unstable fractures may require:
K-wire fixation
Screw fixation
Plate fixation
Combined fixation
Large fragments may accept screws.
Small avulsion fragments may be better suited to:
Hook plates
Suture anchors
K-wires
The use of hook plates for small UCL avulsion fragments is one example of adapting fixation to fragment size.
If satisfactory reduction can be achieved and maintained, percutaneous fixation may minimize soft-tissue disruption.
If reduction cannot be obtained or maintained, ORIF may be required.
Rigid fixation can facilitate earlier controlled rehabilitation in selected fractures.
However, early motion should never compromise fracture stability.
| Fixation method | Typical applications | Main advantages | Important considerations |
|---|---|---|---|
| K-wires | Distal phalanx, Bennett, selected proximal phalanx fractures | Minimally invasive, versatile | Pin-site infection, migration, less rigid fixation |
| Headless compression screws | Metacarpal head, selected intra-articular fractures | Compression, low-profile implant | Requires adequate fragment size and screw trajectory |
| Mini screws | Condylar and small articular fragments | Direct fixation | Limited by fragment size |
| Hook plates | UCL avulsion fractures | Captures small fragments | Possible hardware irritation |
| Locking plates | Unstable metacarpal/proximal phalanx fractures, selected Rolando fractures | Angular stability, rigid fixation | More soft-tissue exposure |
| External fixation | Highly comminuted fractures | Useful when fragments are too small for internal fixation | Pin-site complications and external hardware |
K-wires remain common in hand fracture surgery, while plate and screw constructs can provide greater rigidity and may facilitate earlier mobilization in appropriately selected fractures. However, comparative evidence does not support one fixation method for every thumb fracture pattern.
Postoperative management depends on fracture stability, fixation method, soft-tissue injury, and joint involvement.
Important considerations include:
A thumb-spica or other appropriate splint may be used to protect the fixation during the early healing period.
Early controlled motion may be beneficial when fixation is sufficiently stable.
However, motion should be delayed when necessary to protect unstable fractures or repaired soft tissues.
Exposed K-wires require appropriate pin-site care and follow-up.
The timing of K-wire removal depends on fracture healing and fixation stability.
Follow-up imaging should evaluate:
Fracture alignment
Joint congruity
Loss of reduction
Hardware position
Evidence of union
Grip strength, pinch strength, thumb opposition, and overall hand function should be assessed before returning to heavy manual work or sports.
Although modern fixation techniques can provide reliable stabilization, complications remain possible.
These include:
Loss of fracture reduction
Nonunion or delayed union
Malunion
Joint stiffness
Tendon adhesion
Hardware irritation
Pin-site infection
Neurovascular injury
Post-traumatic arthritis
CMC instability
MCP instability
The risk depends strongly on fracture pattern, soft-tissue injury, fixation method, and postoperative rehabilitation.
For Bennett and Rolando fractures, restoration of CMC joint congruity is an important treatment objective because residual deformity or instability can contribute to long-term degenerative changes.
There is no single fixation method that is best for every thumb fracture. K-wires, screws, plates, hook plates, and other techniques may all have appropriate indications depending on the fracture location, stability, fragment size, and joint involvement.
Surgery may be considered for displaced or unstable fractures, significant intra-articular fractures, fracture-dislocations, irreducible fractures, and selected ligament avulsion fractures with instability.
A Bennett fracture is an intra-articular fracture-subluxation involving the base of the first metacarpal and the thumb CMC joint.
A Rolando fracture is a comminuted intra-articular fracture of the base of the first metacarpal, classically described as a Y- or T-shaped fracture pattern.
Yes. Closed reduction and percutaneous K-wire fixation is a commonly used surgical technique for unstable Bennett fractures. The fixation configuration should be selected according to the fracture morphology and should provide adequate stability while minimizing joint and soft-tissue injury.
A small hook plate can be useful for selected small avulsion fragments, particularly thumb UCL fracture-avulsion injuries at the base of the proximal phalanx.
Both have specific indications. K-wires are versatile and minimally invasive, while plates and screws can provide more rigid fixation. The choice should be based on fracture stability, fragment size, location, and soft-tissue considerations rather than a universal preference for one implant.
The thumb is essential for grip, pinch, opposition, and fine hand function, making accurate treatment of thumb fractures particularly important.
Thumb fractures can range from relatively simple distal phalanx injuries to complex intra-articular fractures of the first metacarpal base.
The major fixation strategies discussed in this article include:
Robert's view for intraoperative assessment of the thumb CMC joint
K-wire fixation of transverse distal phalanx fractures
K-wire fixation of comminuted distal phalanx fractures
Hook plate or K-wire fixation of bony mallet injuries
K-wire stabilization of volar marginal distal phalanx fractures with IP subluxation
Screw fixation of proximal phalanx bicondylar fractures
Hook plate fixation of UCL avulsion fractures
K-wire or plate fixation of extra-articular first metacarpal fractures
Headless compression screw fixation of first metacarpal head fractures
Percutaneous K-wire fixation of Bennett fractures
Open or percutaneous fixation of Rolando fractures
The key principle is that fixation should be matched to the fracture anatomy.
Small avulsion fragments may benefit from hook plates or suture-based techniques, while sufficiently large articular fragments may accept screws. K-wires remain useful for temporary or definitive stabilization, particularly in smaller bones and selected fracture-dislocations. More complex fractures may require locking plates or combined fixation.
For Bennett and Rolando fractures, accurate assessment of the thumb CMC joint is particularly important. Robert's view, additional fluoroscopic projections, and CT when necessary can help define the fracture pattern and guide fixation.
Ultimately, successful thumb fracture management requires a balance between anatomical reduction, stable fixation, preservation of soft tissues, protection of joint function, and appropriate rehabilitation. Current evidence does not support a single fixation technique for all thumb fractures; individualized treatment based on fracture morphology and stability remains the central principle.
