Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Hills, MI. Last updated April 2026.

Walk into any sporting goods store or pharmacy and you’ll find dozens of ankle braces. A prescription custom ankle-foot orthosis (AFO) from a certified orthotist, by contrast, can cost several hundred to several thousand dollars. Both serve legitimate purposes — but the indications for each differ substantially, and choosing incorrectly leads to either undertreating a serious condition or spending unnecessarily on a device that provides no more benefit than an OTC option.

Over-the-Counter Ankle Braces

OTC ankle braces are designed for a specific, common indication: lateral ankle instability from ligament sprains. A lace-up ankle stabilizer, hinged brace, or semi-rigid brace provides proprioceptive feedback and physical restraint to inversion — the motion that sprains the ATFL and CFL ligaments. They are appropriate for:

• Mild-to-moderate lateral ankle ligament sprains (Grade I–II) in athletes
• Return-to-sport support after Grade II–III sprains with intact neuromuscular control
• Prophylactic use in high-risk athletes with prior sprain history (basketball, volleyball, soccer)
• Mild functional ankle instability (subjective giving way without structural ligament failure)

OTC braces do NOT adequately address: drop foot, PTTD/adult flatfoot, significant Achilles weakness, complex ankle arthritis, or neurological conditions affecting foot control.

Custom Ankle-Foot Orthoses (AFO)

A custom AFO is a prescription device fabricated from a cast or 3D scan of the patient’s lower leg and foot, controlling foot and ankle position through the entire gait cycle. AFO types include:

• Posterior leaf spring (PLS) AFO: Flexible carbon fiber or polypropylene — provides dorsiflexion assist for mild drop foot with preserved push-off strength
• Solid ankle AFO: Rigid polypropylene — controls both dorsiflexion and plantarflexion; used for spastic foot drop (stroke, cerebral palsy), severe PTTD, and ankle arthritis
• Articulated AFO: Hinged at the ankle, allows controlled motion while limiting abnormal ranges
• Arizona AFO (low-profile): A gauntlet-style leather and metal brace extending from just below the knee to the foot — used for Stage II PTTD and ankle arthritis where motion preservation is desired
• Carbon fiber energy-return AFO: Dynamic AFOs for high-functioning patients and athletes with drop foot or ankle weakness

When a Custom AFO Is Indicated

Custom AFOs are medically necessary (and typically insurance-covered) for:

• Drop foot from peroneal nerve palsy, stroke, ALS, CMT, or other neurological conditions
• Posterior tibial tendon dysfunction (PTTD) Stage I–II — controls progressive deformity
• Charcot neuroarthropathy — protects and offloads the fragile Charcot foot
• Ankle arthritis with significant malalignment — controls deformity without surgery
• Severe spastic gait from neurological injury
• Patients with diabetic neuropathy and significant foot deformity

Insurance and Medicare Coverage

Custom AFOs are covered by Medicare Part B as a durable medical equipment (DME) benefit when prescribed for a qualifying diagnosis and when the patient meets medical necessity criteria. Most commercial insurance plans cover custom AFOs with prior authorization. Dr. Biernacki’s office handles prescription, documentation, and precertification coordination for AFO fabrication through certified orthotists.

Custom AFO vs. Off-the-Shelf Ankle Brace — Which Is Right?

Choosing between a custom AFO and an off-the-shelf brace depends on your diagnosis, activity level, and insurance coverage. Our podiatrists evaluate your specific needs and recommend the most effective and cost-efficient support option for your condition.

Learn About Custom Orthotic Devices | Book Your Appointment | Call (810) 206-1402

Clinical References

1. Waterval NF, et al. What works best for foot drop in Charcot-Marie-Tooth disease? A systematic review. Prosthetics and Orthotics International. 2018;42(5):456-465.
2. Bus SA, et al. Therapeutic footwear for people with diabetes: a systematic review. Diabetes/Metabolism Research and Reviews. 2016;32(Suppl 1):299-309.
3. Nolan KJ, et al. Quantification of an activity-based ankle-foot orthosis effect on biomechanical variables. PM & R. 2012;4(8):583-589.

Your Board-Certified Podiatrists

Dr. Tom Biernacki, DPM

Board-Certified · FACFAS

Dr. Carl Jay, DPM

Board-Certified Podiatrist

Dr. Daria Gutkin, DPM

Podiatrist

Dr. Tom Biernacki, DPM

Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon 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 reached over one million views.