In a non‑displaced proximal phalanx fracture, how long should the removable air‑boot orthosis be worn?

Duration of Air Boot Immobilization for Non-Displaced Proximal Phalanx Fractures

For a non-displaced proximal phalanx fracture, the air boot should be worn for 3 weeks if the fracture is clinically healed at that point, rather than the traditional 5 weeks.

Evidence-Based Recommendation

The most recent high-quality evidence demonstrates that immobilization can be safely discontinued at 3 weeks for clinically healed fractures 1. This 2024 randomized controlled trial in children with non-displaced or minimally displaced proximal phalangeal fractures showed that stopping immobilization at 3 weeks (when clinically healed) was non-inferior to the traditional 5-week protocol. All confidence intervals overlapped by >10%, indicating no clinically significant difference in outcomes including total active motion, grip strength, and parent-reported function 1.

Clinical Assessment at 3 Weeks

At the 3-week mark, you should assess for:

• Clinical healing: Absence of tenderness at fracture site
• Stability: No pain with gentle stress testing
• Radiographic confirmation: Callus formation visible on x-ray

If these criteria are met, discontinue the air boot and begin active range of motion exercises 1.

Supporting Evidence Across Age Groups

While the strongest evidence is from pediatric populations, the principle applies broadly:

• Pediatric data (2024): Children presenting as clinically healed at 3 weeks had excellent outcomes with immobilization cessation at that point, with full range of motion typically achieved by 12 weeks 1

• Dynamic splinting approach (2021): Early functional treatment with protective dynamic splinting showed good outcomes with shorter immobilization periods (typically 2 weeks or less of rigid immobilization) 2

• Adult data (2026): The POINT trial comparing surgery versus non-surgical splint treatment showed no difference in hand function at 6 months, supporting conservative management effectiveness 3

Common Pitfalls to Avoid

• Over-immobilization: Keeping the boot on for the traditional 5 weeks when clinical healing is evident at 3 weeks leads to unnecessary stiffness and prolonged recovery
• Inadequate assessment: Failing to properly assess clinical healing at 3 weeks may result in premature discontinuation
• Ignoring displacement: This recommendation applies specifically to non-displaced or minimally displaced stable fractures—any significant displacement requires different management

Algorithm for Decision-Making

Week 3 Assessment:

1. Examine for point tenderness → If absent, proceed to step 2
2. Check radiographs for callus formation → If present, proceed to step 3
3. Test stability with gentle stress → If stable, discontinue air boot
4. Begin active range of motion exercises with buddy taping for protection

If any concerns at Week 3:

• Continue immobilization for 1-2 more weeks
• Reassess weekly until criteria met

The therapist assessment of fracture healing is an appropriate indicator for intervention and supports a therapist-led model of care 1.