Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle, Howell & Bloomfield Township, MI
Last reviewed: May 2026
The most important clinical decision with Amyloidosis Foot and Ankle: Infiltration, Neuropathy, and Management isn’t which treatment to choose — it’s identifying which subtype you have first. Our podiatrists see patients treated for the wrong subtype for months before the correct diagnosis leads to full resolution. Call (810) 206-1402 — expert podiatric care across Michigan.
Amyloidosis deposits insoluble misfolded protein fibrils in tissues throughout the body. The foot and ankle are affected in multiple amyloid subtypes — particularly AL amyloidosis (light chain), hereditary transthyretin amyloidosis (hATTR), and wild-type transthyretin amyloidosis (ATTRwt). Peripheral neuropathy and soft tissue infiltration are the dominant podiatric manifestations, and foot symptoms are often among the earliest disease signs.
Amyloid Subtypes and Foot Manifestations
| Amyloid Type | Source Protein | Foot/Ankle Manifestation | Key Clinical Clue |
|---|---|---|---|
| AL (light chain) | Monoclonal immunoglobulin light chains (plasma cell dyscrasia) | Peripheral neuropathy; soft tissue infiltration; macroglossia; purpura | Periorbital purpura; macroglossia; M-protein on SPEP |
| hATTR (hereditary transthyretin) | Mutant TTR gene (Val30Met and others) | Peripheral neuropathy (often length-dependent); autonomic neuropathy; carpal/tarsal tunnel | Family history; bilateral CTS; progressive distal neuropathy; cardiac |
| ATTRwt (wild-type / senile) | Wild-type transthyretin; age-related misfolding | Carpal tunnel syndrome (bilateral, severe, often initial symptom); tarsal tunnel; tendon infiltration | Older male; bilateral CTS before cardiac diagnosis |
| AA (secondary amyloidosis) | Serum amyloid A from chronic inflammation (RA, IBD) | Primarily renal/hepatic; foot involved if peripheral neuropathy develops | Chronic inflammatory disease history |
Podiatric Assessment and Management
| Problem | Assessment Tool | Management |
|---|---|---|
| Peripheral neuropathy | 10g monofilament; vibration; NCS/EMG | Protective footwear; total-contact insoles; fall prevention; foot inspection education |
| Autonomic neuropathy (orthostatic, anhidrosis) | Orthostatic BP; sweat testing | Compression stockings; fall risk mitigation; skin moisturizing for dry feet |
| Tarsal tunnel syndrome | Tinel at tarsal tunnel; MRI for infiltration | Decompression surgery; coordinate with hematology/neurology |
| Tendon infiltration / rupture | MRI; ultrasound of posterior tibial, Achilles | Orthotic support; tendon repair if acute rupture |
| Skin fragility / purpura | Visual inspection; avoid trauma | Padded socks; avoid sharp debridement; wound care if break in skin |
Disease-modifying therapies (tafamidis for ATTR, chemotherapy/stem cell for AL) can stabilize neurologic progression. At Balance Foot & Ankle in Howell and Bloomfield Township, we manage amyloid-related foot and ankle complications in coordination with hematology and neurology. Call (810) 206-1402.
PubMed: Amyloidosis Foot and Ankle
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Doctor Answer
How does amyloidosis affect the feet?
Amyloidosis deposits abnormal protein fibrils in tissues, affecting the feet through peripheral neuropathy causing numbness and burning, and infiltration of tendons and soft tissues causing thickening and stiffness. Carpal tunnel syndrome and plantar fascia thickening are recognized manifestations. The neuropathy from amyloidosis can mimic diabetic neuropathy. Treatment addresses the underlying amyloid type — some respond to chemotherapy or stem cell transplantation, while foot symptoms are managed supportively.
Dr. Tom Biernacki, DPM is a board-certified foot & ankle surgeon (ABFAS & ABPM) at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has made him one of the most-followed foot & ankle educators on YouTube.