VACOPED Boot at Neutral (0°): Flat Sole Transition
It is acceptable to remain in the VACOPED boot at neutral (0°) without transitioning to a flat-sole shoe, as the boot itself provides adequate protection and controlled mobilization at this stage of rehabilitation. The key priority is maintaining dorsiflexion restriction and protected weight-bearing, which the VACOPED boot accomplishes regardless of sole configuration 1.
Rationale Based on Guidelines
The AAOS guidelines emphasize that protective devices limiting dorsiflexion are essential throughout the postoperative period 1. The critical recommendation states: "We suggest the use of a protective device that allows mobilization by 2 to 4 weeks postoperatively" with devices that "limited dorsiflexion to protect the repair" 1.
What Matters Most:
- Dorsiflexion protection - The boot must prevent excessive dorsiflexion that could compromise the repair
- Controlled weight-bearing - Early protected weight-bearing (≤2 weeks) improves return to activities without compromising long-term outcomes 1
- Patient compliance - The device must be used consistently, as noncompliance significantly increases rerupture risk 1
Evidence on VACOPED Specifically
Recent research demonstrates that the VACOPED boot shows the smallest range of dorsiflexion motion (1.8°) compared to other orthotic boots 2. This superior motion restriction is the primary protective mechanism, not the sole type. Additionally, systematic review data shows VACOPED has:
- Lowest complication rates (5.75%) compared to other boot types 3
- Lowest re-rupture rates (3.05%) among orthotic devices 3
- Favorable functional outcomes equivalent to other devices 3
Clinical Algorithm for Boot Progression
At 0° (neutral position):
- Continue VACOPED boot with current sole configuration
- Ensure full weight-bearing as tolerated with dorsiflexion restriction maintained
- Focus on compliance with wearing schedule (typically 24 hours initially, then daytime only)
Sole transition is NOT mandatory because:
- The boot's primary function is dorsiflexion control, not sole configuration
- Changing to flat sole may actually increase ankle moment and tendon loading 2
- Protection is maintained through the boot's inherent design limiting motion to ~1.8° 2
Critical Pitfalls to Avoid
⚠️ Rerupture risk factors include:
- Premature boot removal or noncompliance (both documented reruptures occurred with noncompliance) 1
- Allowing excessive dorsiflexion beyond neutral before adequate healing (typically 6-8 weeks)
- Transitioning out of protective device too early
⚠️ Walking speed matters significantly: Even at 0° in the boot, increasing walking speed from 1 km/h to 4 km/h dramatically increases calf muscle activity and tendon loading 4. Counsel patients to maintain controlled, slower walking speeds even when the boot is at neutral.
Practical Recommendation
Continue the VACOPED boot at 0° with its existing sole until:
- Minimum 6-8 weeks post-surgery has elapsed 1
- Progressive dorsiflexion advancement protocol is complete
- Surgeon confirms adequate healing clinically
The flat sole transition is a preference, not a requirement. The boot's motion-limiting design provides protection regardless of sole type, and maintaining the boot longer may actually reduce complication risk 3.