Thirteen-Month-Old AFO: Falls, Redness, and a Change in Condition

Redness over the fibular head: the shell has not changed, but the leg inside it has. A 9 kg weight gain enlarges the calf, so the AFO now pistons; a stretched strap no longer holds the tibia back against the shell; and the trimline that once cleared the fibular head is now sitting 2 cm below it, directly on bone. That combination produces focal pressure at exactly the site you are seeing. The thicker sock adds volume and can also shift the foot distally in the shoe.

Falls: several contributors are plausible and must be separated.

• Fit failure: a loose, pistoning AFO gives poor foot clearance and unpredictable toe-off.
• Tone change: Ashworth 2 plantarflexors drive the foot against the shell at loading response, altering the gait cycle and reducing clearance - the spasticity may now be working against the device rather than being managed by it.
• Footwear: unchanged shoes with a thicker sock changes the base of support and can make the shoe too tight.
• Non-device causes: medications, orthostatic hypotension, vision, and general deconditioning also cause falls in a 71-year-old post-stroke patient. Screen for these rather than attributing everything to the orthosis.

Priority: skin first - assess the fibular head, and if the skin is compromised, stop using the device until it is evaluated.

Do all three, in this order.

1. Immediate safety modification (today): add padding at the fibular head, flare and lower the proximal trimline so it clears the bone, and replace the stretched strap so the device holds the tibia rather than pistoning. Fix the shoe–sock combination so the foot is not jammed. This is triage, not a solution - it buys safety while the real decision is made.
2. Refer back: increased tone at Ashworth 2 is a medical change. Send him to the treating physician and to physical therapy for tone management and gait re-evaluation. The device can complement tone control; it cannot substitute for it, and no amount of trimline adjustment will fix a gait driven by spasticity.
3. Plan for a remake: the calf volume has changed by 9 kg and the tibial crest contour no longer matches the shell. Bench modification cannot restore the correct proximal contour across that much change. Document that a new evaluation and new device are indicated.

Why not just modify and stop there: the fit failure is geometric, not cosmetic. Padding a shell that no longer matches the leg leaves a device that will keep migrating and keep loading the fibular head. Say that plainly to the patient rather than repeatedly nibbling at the problem.

Replacement is not automatic on a calendar basis. Wear alone - or "it's been a year" - is not the standard.

What supports a replacement: the device no longer meets the patient's needs because of an objectively documented change in the patient's condition, and modification of the existing device would not be sufficient. Here that case is strong and specific:

• A 9 kg weight change.
• Tone progressed to a modified Ashworth grade of 2.
• The proximal trimline no longer clears the fibular head, with a corresponding skin lesion.
• Two falls in one month, reflecting a change in function.

What to have in hand:

• A new order or prescription from the treating physician describing the change in condition and the medical need - not a carry-over of the old order.
• Chart documentation of the objective findings: weight, tone grade, trimline position relative to the fibular head, skin findings, fall history.
• A note on why modification is insufficient.
• The payer's own replacement criteria checked in advance, since commercial plans vary and some impose a minimum time since the prior device.
• Delivery documentation once it is dispensed, and the patient's acknowledgement.

Communicate honestly: tell him the clinical case is defensible, but that you will not promise coverage before the payer reviews it, and that he should be told what his out-of-pocket exposure would be if it is denied.