What is the recommended treatment for an acute mildly displaced comminuted intra‑articular fracture of the base of the proximal phalanx of the second toe in a healthy adult?

Treatment of Acute Comminuted Mildly Displaced Intra-articular Fracture of the Proximal Phalanx Base, Second Toe

For a mildly displaced comminuted intra-articular fracture at the base of the proximal phalanx of the second toe, buddy taping to the adjacent toe with protected weightbearing is the recommended initial treatment approach, reserving surgical intervention only for fractures with >2mm articular step-off or progressive displacement.

Initial Management Algorithm

Imaging Assessment

Start with standard 3-view radiographs (AP, lateral, and oblique) of the foot to fully characterize the fracture 1. The oblique view is particularly important for phalangeal fractures as it increases diagnostic yield 1. If radiographs show significant comminution but the degree of articular involvement or step-off is unclear, obtain a CT scan without contrast to better define the articular surface and guide treatment decisions 1.

Treatment Decision Points

Conservative Management (Preferred for Mildly Displaced Fractures):

• Buddy tape the second toe to the third toe for 3-4 weeks
• Allow protected weightbearing in a stiff-soled shoe or walking boot
• Avoid rigid immobilization of the entire foot, as this leads to unnecessary stiffness
• Serial radiographs at 1-2 weeks to ensure no loss of reduction

Surgical Indications:

• Articular step-off >2mm (extrapolated from distal radius literature showing that <2mm step-off is necessary to avoid long-term osteoarthritis) 2, 1
• Progressive displacement on follow-up radiographs
• Involvement of >30-33% of the articular surface with depression 3, 4
• Interfragmentary gap >3mm 1

Rationale and Evidence Considerations

The ACR Appropriateness Criteria 1 establish that standard radiography is the initial imaging modality for all phalangeal fractures, with 3 views being superior to 2 views for detecting fractures and characterizing displacement. While these guidelines focus on hand trauma, the principles directly apply to toe phalanges given similar anatomy and biomechanics.

Key principle from distal radius fracture literature: The AAOS guidelines 2, 5 suggest surgical fixation for intra-articular fractures with significant displacement, though they acknowledge that evidence for specific displacement thresholds is limited. The 2mm articular step-off threshold is consistently cited across multiple guidelines as the cutoff beyond which long-term osteoarthritis risk increases 1.

Toe-specific considerations: Unlike hand fractures where precise function is critical, toe fractures generally tolerate more displacement due to lower functional demands. The second toe bears less weight than the great toe and has less critical function than fingers. Research on proximal phalanx pilon fractures 6, 3, 7, 8 demonstrates that even with surgical intervention, perfect anatomic restoration is rarely achieved, and outcomes with conservative management can be acceptable.

Surgical Approach (If Indicated)

If surgical intervention becomes necessary based on the criteria above:

Preferred technique for comminuted intra-articular fractures:

• Direct intraosseous joint reduction with mini-screws and bone grafting 6, 3
• This technique allows articular surface elevation while preserving the joint capsule and extensor mechanism
• Metaphyseal bone grafting supports the elevated articular surface in fractures with >30% impaction 3

Alternative for highly unstable patterns:

• External fixation with distraction can be considered for severely comminuted fractures where internal fixation would cause further fragmentation 7, 8
• Allows early mobilization while maintaining length and alignment

Avoid:

• Rigid plate fixation in toes (associated with high complication rates including complex regional pain syndrome in 28% of cases in hand fractures) 9
• Prolonged immobilization beyond 3-4 weeks (leads to permanent stiffness) 8, 9

Common Pitfalls

1. Over-treating minimally displaced fractures: The temptation to surgically fix all intra-articular fractures should be resisted. Research shows that 80% of conservatively managed extra-articular proximal phalanx base fractures achieve excellent or good outcomes 9. While this study focused on extra-articular fractures, it demonstrates that phalangeal fractures tolerate conservative management well.

2. Rigid immobilization: Casting or rigid splinting of the entire foot is contraindicated. This leads to stiffness in adjacent joints and prolonged recovery. Buddy taping allows controlled motion while protecting the fracture 10.

3. Delayed recognition of displacement: Serial radiographs at 1-2 weeks are essential. The 2022 AAOS guidelines 5 note that while routine serial imaging may not change outcomes in stable fractures, it remains valuable for detecting early displacement that would warrant intervention.

4. Ignoring articular step-off: Even 2-3mm of articular incongruity can lead to post-traumatic arthritis. If initial radiographs are equivocal regarding articular involvement, obtain CT imaging rather than assuming the fracture is benign 1.

Follow-up Protocol

• Clinical and radiographic assessment at 1-2 weeks to detect displacement
• If alignment maintained, continue buddy taping for total of 3-4 weeks
• Begin active range of motion exercises at 3-4 weeks
• Return to normal footwear as tolerated, typically 4-6 weeks
• No need for routine follow-up radiographs beyond 2 weeks if alignment is maintained and patient is improving clinically 5