Traumatic Brain Injury Patient with Spastic Equinovarus: Tone Management vs. Orthotic Timing
A 34-year-old man is 4 months post severe traumatic brain injury from a motorcycle collision. He has a right spastic equinovarus foot: ankle plantarflexion tone is 3 on the Modified Ashworth Scale, the ankle rests in 20 degrees of plantarflexion, and he has a 10-degree fixed plantarflexion contracture that does not resolve with sustained stretch. He ambulates short distances with a hemi-walker and a therapist's assistance, with circumduction and toe drag on the right. He has no sensation deficit on the right foot, but he does have a healed skin graft on the lateral malleolus from the crash. His therapy team wants an AFO to improve gait. His insurance covers one custom AFO per year. The therapist asks whether a plantarflexion stop AFO or a hinged AFO is better, and whether the contracture should be stretched out first.
1. Given the fixed contracture and high tone, what AFO design and timing do you recommend, and why?
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The fixed 10-degree plantarflexion contracture and Ashworth 3 tone mean a standard plantarflexion stop AFO set at neutral will not be tolerated: forcing the foot to neutral against a fixed contracture creates high pressure at the heel and forefoot and risks skin breakdown, especially over the grafted lateral malleolus. The device must accommodate the contracture, not fight it.
Recommended design: a custom solid-ankle AFO (or a hinged AFO with the plantarflexion stop set at the patient's available range, e.g., 10 degrees plantarflexion) fabricated to the foot's current resting position, with a plantarflexion stop that prevents further drop but does not force dorsiflexion beyond the contracture. A solid AFO provides the most control of tone-driven plantarflexion and toe drag; a hinged AFO allows some ankle motion and may be better tolerated if the contracture is being addressed concurrently. Given the fixed contracture, start with the device molded at the available range, with a padded lateral malleolus relief over the graft.
Timing: do not wait to "stretch out" the contracture before bracing. A fixed contracture at 4 months post-injury is unlikely to resolve with stretch alone, and delaying bracing allows further shortening and gait deterioration. Brace now at the available range, and pursue tone management (botulinum toxin, serial casting, or therapy) in parallel. Recast or adjust the AFO as range improves. Coordinate with the physiatrist; the AFO and tone management are complementary, not sequential.
2. How should the healed lateral malleolus skin graft influence the device design and follow-up plan?
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The graft site is a high-risk pressure point because grafted skin is less tolerant of shear and pressure, even when sensation is intact. Design and follow-up must protect it.
Design changes:
- Relief over the lateral malleolus: a padded cutout or a molded relief in the AFO shell so the graft does not bear direct pressure.
- Trim lines: keep the lateral trim line below or away from the graft, and ensure the shell edge does not cross the graft.
- Padding: soft interface padding over the graft and at the heel; avoid rigid edges.
- Suspension: ensure the device does not migrate and create shear over the graft during gait; a well-molded, snug fit with a strap that does not cross the graft.
Follow-up plan:
- Initial check at 1 week: inspect the graft for redness, blistering, or breakdown after short wear.
- Graduated wear: start with 30-60 minutes twice daily and build up, checking skin each time.
- 2-week and 4-week checks, then routine intervals. Photograph the graft at baseline for comparison.
- Patient/caregiver education: the patient should inspect the site (or a caregiver should) after every wear period; report any redness that does not fade within 20 minutes.
If the graft shows persistent redness or breakdown, modify the relief or switch to a different suspension. Document the graft as a pressure-risk area in the chart so any future device accounts for it.