| Ligament | Function | Injury Rate in Ankle Sprains | Clinical Test | Role in Instability |
|---|---|---|---|---|
| ATFL (Anterior Talofibular) | Resists anterior talar translation; primary plantarflexion stabilizer | Torn in ~70% of sprains | Anterior drawer test | Primary target in modified Brostrom repair |
| CFL (Calcaneofibular) | Resists subtalar inversion in dorsiflexion | Torn in 50–75% of ATFL tears | Talar tilt test | Repaired with ATFL in combined instability |
| PTFL (Posterior Talofibular) | Resists posterior talar translation; strongest lateral ligament | Torn in <10% of sprains | Posterior drawer test | Rarely addressed; strong even in severe sprains |
| Deltoid Complex (medial) | Resists eversion and external rotation | High-energy sprains; Stage IV flatfoot | Eversion stress test | Separate medial repair if concomitant medial instability |
| Treatment | Indication | Success Rate | Return to Sport | Key Notes |
|---|---|---|---|---|
| Functional Rehab (PT + Proprioception) | First-episode instability; acute sprain | 85% return to sport without recurrence | 4–8 weeks | Peroneal strengthening + balance training; first-line always |
| Lace-Up / Semi-Rigid Ankle Brace | Recurrent sprains; in-season athlete; postoperative | Reduces re-sprain risk by 50–70% | Immediate with brace | Does not substitute for rehab; reduces re-injury rate |
| Modified Brostrom Procedure | Chronic instability; failed 3–6 months PT | 85–95% good-to-excellent | 4–6 months | Anatomic ATFL + CFL repair directly to fibula; IER augmentation |
| Brostrom + Gould Modification | Severe laxity; hypermobility; high-demand athletes | 90–95% | 4–6 months | Extensor retinaculum reinforcement; reduces failure risk |
| Allograft / Chrisman-Snook Tenodesis | Revision; failed prior Brostrom; insufficient tissue | 75–85% | 6–9 months | Peroneus brevis or allograft reconstruction; non-anatomic |
| Arthroscopic Brostrom | Chronic instability without severe laxity | 85–90%; comparable to open | 3–4 months (faster) | Smaller incision; faster rehab; growing evidence base |
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Medically Reviewed | Dr. Tom Biernacki, DPM | Board-Certified Podiatric Surgeon | Balance Foot & Ankle, Michigan
Quick Answer:
Quick Answer: What is chronic ankle instability and how is it treated? Chronic ankle instability (CAI) develops after repeated ankle sprains when the lateral ligaments heal incompletely, leaving the ankle prone to recurrent giving way. Treatment progresses from physical therapy and bracing to surgical Broström ligament repair with Gould modification for patients who fail conservative management.
Chronic ankle instability (CAI) is the persistent sense of ankle giving way, repeated sprains, pain, and functional limitation that develops in approximately 20–40% of patients after an initial ankle sprain. When lateral ankle ligaments — primarily the anterior talofibular ligament (ATFL) and calcaneofibular ligament (CFL) — heal with stretching or scarring rather than anatomical restoration, the ankle becomes mechanically lax and susceptible to recurrent inversion injuries.
At Balance Foot & Ankle PLLC in Howell, Michigan, Dr. Tom Biernacki evaluates and treats chronic ankle instability with a systematic approach: confirming the diagnosis with clinical testing and imaging, optimizing conservative management with physical therapy and bracing, and performing surgical Broström ligament repair for patients who have exhausted non-operative options and continue to have functional instability limiting their activities.
Anatomy of Lateral Ankle Ligaments
The lateral ankle complex consists of three ligaments. The anterior talofibular ligament (ATFL) is the weakest and most commonly torn — it limits anterior translation and internal rotation of the talus. The calcaneofibular ligament (CFL) crosses the subtalar joint and limits inversion at both the ankle and subtalar joints. The posterior talofibular ligament (PTFL) is rarely injured. The ATFL is injured in approximately 65% of ankle sprains; combined ATFL and CFL tears occur in more severe inversion injuries.
Diagnosis of Chronic Ankle Instability
Clinical diagnosis relies on history (repeated ankle sprains, perceived giving way, activity-related pain) and physical examination. The anterior drawer test assesses ATFL laxity by applying anterior force to the foot while stabilizing the tibia — a positive test shows excessive anterior translation of the talus. The talar tilt test evaluates CFL integrity. Stress X-rays quantify laxity objectively when clinical findings are equivocal. MRI assesses the structural integrity of the ATFL and CFL and identifies associated pathology — particularly peroneal tendon tears, osteochondral defects of the talus, and anterior ankle impingement — that coexist with instability in a significant percentage of patients.
Conservative Management of CAI
Physical therapy is the cornerstone of conservative CAI management. A structured neuromuscular training program targeting peroneal muscle strength, proprioception, and single-limb balance significantly reduces the frequency and severity of giving-way episodes. The Bergen protocol and similar balance training programs have Level I evidence supporting their efficacy for functional instability. Custom orthotic therapy with lateral hindfoot posting reduces inversion stress during gait. Ankle bracing — lace-up stabilizers (ASO, McDavid) during high-risk activities — is a practical adjunct for patients who need protection during athletic participation.
Conservative management is successful in approximately 60–70% of patients with CAI when implemented consistently over 3–6 months. Patients who fail this approach, who have MRI-confirmed ligament tears with persistent structural laxity, or who cannot participate in high-risk activities without recurrent giving way are candidates for surgical lateral ankle stabilization.
Broström-Gould Lateral Ankle Ligament Repair
The modified Broström-Gould procedure is the gold standard surgical treatment for chronic lateral ankle instability. The procedure involves direct anatomical repair of the attenuated ATFL and CFL — imbrication (folding and tightening) of the stretched ligament tissue using non-absorbable sutures — reinforced by augmentation with the extensor retinaculum (Gould modification). This augmentation adds a second layer of strong fibrous tissue over the primary repair, improving initial strength and long-term durability.
The procedure is performed through a J-shaped incision anterior to the lateral malleolus, typically under regional or general anesthesia as an outpatient surgery. Associated pathology — peroneal tendon tears, osteochondral defects, anterior ankle impingement — is addressed simultaneously via ankle arthroscopy prior to the open repair. Recovery involves 4–6 weeks of non-weight-bearing in a short leg cast, followed by progressive rehabilitation over 4–6 months. Return to sport is typically at 5–6 months post-operatively. Long-term outcomes for the modified Broström are excellent, with success rates of 85–95% for returning patients to their pre-injury activity level without further instability. Call Balance Foot & Ankle at (517) 315-6969 for a chronic ankle instability evaluation in Howell, Michigan.
Dr. Tom's Product Recommendations
ASO Ankle Stabilizer Lace-Up Brace
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Medical-grade lace-up ankle stabilizer with bilateral strapping — the most prescribed brace for chronic ankle instability during athletic activities and rehabilitation.
Dr. Tom says: “I’ve worn this for years with my chronic instability. Fits in cleats, basketball shoes, and hiking boots.”
Athletes with chronic ankle instability who need lateral support during sport without bulky rigid bracing
Severe instability with complete ligament tears — consult Dr. Biernacki about whether surgical stabilization is appropriate
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BOSU Balance Trainer
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Balance trainer for proprioception and neuromuscular rehabilitation after ankle sprain and chronic instability — a key home exercise tool for CAI conservative management.
Dr. Tom says: “My physical therapist had me use this every day. My ankle stability improved dramatically over 8 weeks.”
Chronic ankle instability patients in the neuromuscular rehabilitation phase of conservative treatment
Acute ankle sprain in the early inflammatory phase — balance training should begin only after initial healing
Disclosure: We earn a commission at no extra cost to you.
✅ Pros / Benefits
- Modified Broström-Gould repair achieves 85–95% success rate for returning athletes to sport without instability
- Concurrent arthroscopy addresses associated osteochondral defects and impingement at the same surgical setting
- Conservative management with neuromuscular training is effective in 60–70% of CAI patients
- Anatomical ligament repair preserves normal ankle joint mechanics unlike non-anatomical tenodesis procedures
❌ Cons / Risks
- Broström repair requires 5–6 months total recovery before return to sport
- Non-anatomical reconstruction (Chrisman-Snook, Watson-Jones) sacrifices peroneal tendon tissue and should be reserved for revision cases
- Hyperlaxity syndromes (Ehlers-Danlos) have higher surgical failure rates and may require augmentation with graft tissue
Dr. Tom Biernacki’s Recommendation
Chronic ankle instability is one of the most common problems I treat in active patients, and it’s one where I have strong opinions about conservative management first. I’ve seen too many patients rushed to surgery for instability that responds completely to a good neuromuscular training program. Three months of serious proprioception training can change the trajectory entirely. But when instability persists despite real efforts at rehabilitation, the Broström repair is an excellent procedure with predictable outcomes — and I don’t hesitate to recommend it when it’s the right call.
— Dr. Tom Biernacki, DPM | Board-Certified Podiatric Surgeon | Balance Foot & Ankle
Frequently Asked Questions
What is the Broström procedure for ankle instability?
The Broström procedure is a surgical repair of the stretched anterior talofibular ligament (ATFL) and calcaneofibular ligament (CFL) using non-absorbable sutures to imbricate (tighten) the attenuated tissue back to its anatomical position. The Gould modification adds reinforcement with the extensor retinaculum. The result is anatomical restoration of the lateral ligament complex with excellent return-to-sport outcomes.
How long does it take to return to sports after Broström repair?
Return to sport after modified Broström repair typically occurs at 5–6 months post-operatively. The timeline includes 4–6 weeks non-weight-bearing, 4–6 weeks in a boot with progressive weight-bearing, followed by 3–4 months of physical therapy with sport-specific progression. High-level cutting and pivoting sports (basketball, soccer, football) require the full 5–6 months for safe return.
Can I play sports with chronic ankle instability without surgery?
Yes — many athletes successfully manage chronic ankle instability with bracing, proprioceptive training, and activity modification without ever needing surgery. Surgery is recommended when instability persists despite these measures and significantly limits activity, or when MRI shows complete ligament tears with structural laxity that is unlikely to respond to conservative care.
What is the difference between mechanical and functional ankle instability?
Mechanical instability refers to true ligamentous laxity — the joint opens more than normal on stress testing. Functional instability refers to the subjective sense of giving way and impaired balance despite normal ligament laxity, typically from impaired proprioception and peroneal muscle weakness after acute sprain. Both can coexist. Functional instability often responds to neuromuscular training; mechanical instability with confirmed laxity is more likely to require surgical correction.
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When should I see a podiatrist?
If symptoms persist past 2 weeks, affect your normal activity, or are accompanied by red-flag symptoms (warmth, redness, swelling, inability to bear weight).
What does treatment cost?
Most diagnostic visits and conservative treatments are covered by Medicare and major insurers. Out-of-pocket costs vary by your specific plan.
How quickly can I get an appointment?
Most non-urgent cases see us within 5 business days. Urgent cases (sudden pain, possible fracture) typically same or next business day.
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.
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