Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Hills, MI. Last updated April 2026.
Medically Reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatrist, Balance Foot & Ankle Specialists, Michigan. Last updated April 2026.
The lateral ankle ligament complex — the anterior talofibular ligament (ATFL), calcaneofibular ligament (CFL), and posterior talofibular ligament (PTFL) — is the most commonly injured ligament complex in the body. Understanding the anatomy and biomechanical role of each ligament component explains why the ATFL fails first in almost all ankle sprains, why isolated ATFL injuries are usually stable, and why combined ATFL + CFL injuries represent higher-grade instability requiring more aggressive management.
ATFL — Anterior Talofibular Ligament
The ATFL is the weakest and most commonly injured of the three lateral ligaments — it is a flat, band-like structure running from the anterior fibular tip to the anterolateral talar body, oriented nearly horizontal in a dorsiflexed foot and vertical in a plantarflexed foot. In plantarflexion (the position of the ankle during most inversion sprains), the ATFL becomes the primary restraint to inversion — the position of maximum tensile stress explains its vulnerability. The anterior drawer test — the primary clinical test for ATFL integrity — measures anterior talar translation against the tibial plafond; positive test indicates ATFL failure.
CFL — Calcaneofibular Ligament
The CFL — a round, cord-like structure from the fibular tip to the lateral calcaneus — runs obliquely from anterosuperior to posteroinferior, crossing both the ankle joint and the subtalar joint. The CFL is the primary restraint to subtalar inversion and secondary restraint to ankle inversion in dorsiflexion. CFL failure occurs after ATFL failure in higher-grade lateral ankle sprains — combined ATFL + CFL disruption produces both ankle and subtalar joint instability. The talar tilt test measures CFL integrity; stress X-ray talar tilt >9 degrees (or 3 degrees asymmetry from contralateral) indicates CFL failure.
PTFL — Posterior Talofibular Ligament
The PTFL is the strongest of the three lateral ligaments and is rarely injured in isolation — its position on the posterior fibular makes it most vulnerable in ankle fracture-dislocations with posterior talar displacement. Isolated PTFL injury alone is clinically rare in standard ankle sprains. Dr. Biernacki at Balance Foot & Ankle evaluates acute and chronic ankle instability with clinical ligament stress testing and imaging, and provides the full spectrum of ankle sprain management from rehabilitation to Broström repair. Call (810) 206-1402 at our Bloomfield Hills or Howell office.
📧 Get Dr. Tom’s Free Lab Test Guide
Discover the 5 lab tests every person over 35 should ask their doctor about — explained in plain English by a board-certified physician.
📍 Located in Michigan?
Our board-certified podiatrists treat this condition at two convenient locations. Same-day appointments often available.
When to See a Podiatrist
Many foot conditions can be managed conservatively at home, but some require professional evaluation. See a podiatrist promptly if you experience:
- Pain that persists for more than 2 weeks despite rest
- Swelling, redness, or warmth that isn’t improving
- Numbness, tingling, or burning in the feet
- A wound or sore that is not healing within 2 weeks
- Any foot concern if you have diabetes or poor circulation
- Nail changes that suggest fungal infection or other problems
At Balance Foot & Ankle, our three board-certified podiatrists — Dr. Tom Biernacki, Dr. Carl Jay, and Dr. Daria Gutkin — provide comprehensive foot and ankle care at our Howell and Bloomfield Township offices. Most insurance plans are accepted.
Related Conditions & Resources
Ready to Get Relief? We’re Here to Help.
Board-certified podiatrists Dr. Tom Biernacki, Dr. Carl Jay, and Dr. Daria Gutkin see patients daily at our Howell and Bloomfield Township, MI offices.
📅 Book Online
📞 (810) 206-1402
Ankle Ligament Anatomy & Sprain Treatment in Michigan
Understanding which ankle ligaments are injured guides proper treatment. Our podiatrists perform detailed clinical examination to identify ATFL, CFL, PTFL, and deltoid injuries, then create evidence-based rehabilitation plans tailored to your specific ligament damage.
Learn About Ankle Sprain Treatment | Book Your Appointment | Call (810) 206-1402
Clinical References
- Doherty C, Delahunt E, Caulfield B, et al. The incidence and prevalence of ankle sprain injury: a systematic review and meta-analysis. Sports Med. 2014;44(1):123-140.
- van den Bekerom MPJ, Kerkhoffs GMMJ, McCollum GA, et al. Management of acute lateral ankle ligament injury in the athlete. Knee Surg Sports Traumatol Arthrosc. 2013;21(6):1390-1395.
- Gould N, Seligson D, Gassman J. Early and late repair of lateral ligament of the ankle. Foot Ankle. 1980;1(2):84-89.
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.
- Plantar Fasciitis: Diagnosis and Conservative Management (PubMed)
- Plantar Fasciitis (APMA)
- Diagnosis and Treatment of Plantar Fasciitis (PubMed / AAFP)
- Heel Pain (APMA)