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

What Is Chronic Lateral Ankle Instability?

Chronic lateral ankle instability (CLAI) is a condition of persistent ankle giving-way, recurrent lateral ankle sprains, and subjective feelings of ankle weakness that persists more than 12 months after the initial ankle sprain. It affects approximately 20–40% of patients who sustain a lateral ankle sprain — the ligaments (ATFL and CFL) that were stretched or torn in the original sprain either fail to heal fully or heal in a lengthened position that cannot provide adequate mechanical restraint against inversion. The result is an ankle that continues to roll on uneven surfaces, during sports, or even during routine daily activities. CLAI is not simply a consequence of “weak ankles” — it represents a mechanical insufficiency of the lateral ligament complex that proprioceptive training alone cannot fully correct. At Balance Foot & Ankle in Howell and Bloomfield Hills, Michigan, Dr. Tom Biernacki, DPM evaluates chronic ankle instability. Call (810) 206-1402.

Mechanical vs. Functional Instability — Why the Distinction Matters

Chronic ankle instability has two components that require separate assessment: mechanical instability — demonstrable laxity on stress examination (anterior drawer test and talar tilt test) indicating ligament elongation or rupture with excessive joint translation; and functional instability — deficits in proprioception, peroneal muscle reaction time, and neuromuscular control that persist even when mechanical laxity is minimal. Most CLAI patients have both components. The treatment pathway differs: functional instability responds to focused proprioceptive rehabilitation and peroneal strengthening; mechanical instability requires surgical ligament reconstruction when conservative treatment fails. Treating functional instability with surgery alone — without rehabilitating the proprioceptive deficit — leads to recurrent instability even after technically successful ligament repair.

Conservative Management Protocol

Conservative management of CLAI requires 3–6 months of structured rehabilitation before surgical consideration: lace-up ankle brace during all sports activity for 6–12 months post-sprain (reduces re-sprain rate by 60–70%); peroneal strengthening program — specifically single-leg eccentric peroneal exercises and resistance band eversion strengthening; proprioceptive training on unstable surfaces (wobble board, BOSU, single-leg balance progressions); taping techniques for high-risk activities; and footwear optimization (motion-control features, lateral heel posting in orthotics to resist inversion). Patients who complete a structured 3-month program show 60–70% improvement in functional instability — but mechanical instability (positive anterior drawer or talar tilt) does not respond to rehabilitation and requires surgical decision-making.

Surgical Management — Modified Brostrom-Gould Repair

The modified Brostrom-Gould procedure is the gold-standard surgical treatment for CLAI: the ATFL and CFL are shortened and imbricated (overlapped and tightened) back to their anatomic attachments on the fibula; the inferior extensor retinaculum is advanced over the repair to reinforce it (Gould modification); recovery 6–8 weeks non-weight-bearing, 3–4 months to full sports return. Long-term success rate exceeds 85% at 10 years. The Brostrom repair is an anatomic reconstruction — it restores the native ligament length rather than rerouting a tendon graft — which preserves normal ankle kinematics and allows full sports return in most patients. Tendon graft reconstruction (Chrisman-Snook, Watson-Jones) is reserved for revision cases or patients with extreme hyperlaxity.

Associated Conditions That Must Be Assessed

Chronic ankle instability is frequently accompanied by secondary pathology that worsens outcomes if untreated: peroneal tendon tears (longitudinal split tears occur in 25–30% of CLAI cases from repetitive loading during inversion episodes — MRI is required); osteochondral lesion of the talar dome (articular cartilage damage from repeated impaction — CT arthrogram or MRI for diagnosis); sinus tarsi syndrome (persistent pain in the lateral ankle sinus tarsi from synovitis); and subtalar instability (calcaneofibular ligament laxity affecting the subtalar joint). MRI of the ankle is appropriate before surgical planning to identify all concurrent pathology that should be addressed at the time of Brostrom repair.

Chronic Ankle Instability Management in Howell & Bloomfield Hills Michigan

Dr. Tom Biernacki, DPM evaluates chronic lateral ankle instability with clinical stress testing, MRI coordination, and structured conservative management before surgical consultation at Balance Foot & Ankle. Serving Howell, Brighton, Milford, Bloomfield Hills, Troy, Auburn Hills, and all Southeast Michigan. Book your evaluation or call (810) 206-1402.

Chronic Ankle Instability Treatment in Michigan

Recurrent ankle sprains and chronic giving way indicate ligament damage that won’t heal with rest alone. Our surgeons evaluate ankle stability and offer both rehabilitation programs and surgical reconstruction for lasting ankle stability.

Learn About Our Ankle Instability Treatments → | Book Your Appointment | Call (810) 206-1402

Clinical References

1. Hintermann B, et al. Biomechanical and clinical considerations in lateral ankle instability. Foot Ankle Int. 2002;23(5):456-461.
2. Hertel J. Functional anatomy, pathomechanics, and pathophysiology of lateral ankle instability. J Athl Train. 2002;37(4):364-375.
3. DiGiovanni BF, et al. Associated injuries found in chronic lateral ankle instability. Foot Ankle Int. 2000;21(10):809-815.

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.