Chronic Ankle Instability

Chronic ankle instability (CAI) is a condition characterized by recurrent ankle sprains and a persistent feeling that the ankle is "giving way," especially on uneven surfaces or during athletic activities. It typically develops after one or more ankle sprains that don't heal completely, leaving the ligaments stretched or torn.

The lateral ankle ligaments—particularly the anterior talofibular ligament (ATFL) and calcaneofibular ligament (CFL)—are most commonly affected. When these ligaments remain loose after a sprain, they fail to provide adequate joint stability, leading to repeated injuries that further damage cartilage and increase arthritis risk.

At Mountain Spine & Orthopedics, our foot and ankle specialists are experts in diagnosing and treating chronic ankle instability. We offer comprehensive evaluation, advanced rehabilitation protocols, and when necessary, minimally invasive ligament reconstruction surgery to restore stability and protect your ankle from future damage.

Patients with chronic ankle instability typically experience:

• Repeated ankle sprains: Rolling the ankle frequently, even with minor movements
• Feeling of instability: Sensation that the ankle will "give way" or buckle
• Persistent ankle swelling: Especially after activity
• Pain on the outer (lateral) ankle: At the site of the damaged ligaments
• Tenderness: Over the front and outside of the ankle
• Difficulty walking on uneven ground: Increased risk of rolling the ankle
• Decreased confidence: Hesitation during sports or physical activities
• Stiffness: Especially in the morning or after rest

If you experience these symptoms, prompt evaluation can prevent further joint damage and reduce your risk of developing ankle arthritis.

Understanding the causes of chronic ankle instability helps identify risk factors:

• History of ankle sprain: Especially sprains that weren't properly rehabilitated
• Multiple previous sprains: Each sprain increases instability risk
• Returning to activity too soon: Before complete healing
• Inadequate rehabilitation: Not completing physical therapy after a sprain
• Loose ligaments (hypermobility): Genetic predisposition to ligament laxity
• Weak peroneal muscles: Insufficient dynamic ankle support
• Poor proprioception: Impaired balance and position sense
• High-risk activities: Basketball, soccer, running on uneven terrain

Comprehensive diagnosis of chronic ankle instability includes:

• Medical history: Number of sprains, mechanism of injury, previous treatment
• Physical examination: Anterior drawer test, talar tilt test, and assessment of ligament laxity
• Stress X-rays: Evaluate joint opening under stress compared to the opposite ankle
• MRI: Detailed evaluation of ligament integrity and cartilage damage; complimentary MRI review available
• Proprioception testing: Assessment of balance and position sense

We also evaluate for associated conditions including osteochondral lesions (cartilage damage) and peroneal tendon problems that commonly occur with chronic instability.

Treatment for chronic ankle instability depends on severity and patient goals.

Non-Surgical Treatment

Conservative care is often effective and includes:

• Physical therapy: Focus on peroneal strengthening, proprioception training, and balance exercises
• Bracing: Lace-up ankle braces or semi-rigid braces provide external support during activities
• Activity modification: Avoiding high-risk activities until stability improves
• Taping: Athletic taping for sports participation
• NSAIDs: For pain and inflammation management

Surgical Treatment

Surgery is recommended when conservative treatment fails or for severe instability. Options include:

• Broström-Gould procedure: Direct repair and tightening of the stretched ligaments—the gold standard for anatomic repair
• Ligament reconstruction: Reconstruction using tendon graft for severe cases or failed primary repair
• Arthroscopic evaluation: Ankle arthroscopy to address associated cartilage damage

Most ligament surgeries are minimally invasive with excellent success rates (85-95%) for restoring stability and returning patients to sports.

Pain from chronic ankle instability arises from multiple sources: ligament stress during episodes of giving way, inflammation from repeated minor injuries, and cartilage damage that accumulates over time. Chronic instability is a leading cause of post-traumatic ankle arthritis.

Preventing chronic ankle instability starts with proper treatment of the initial sprain.

• Complete rehabilitation: Don't return to sports until fully recovered from a sprain
• Strengthen ankle muscles: Especially the peroneal muscles on the outside of the ankle
• Balance training: Single-leg standing, wobble boards, and BOSU exercises
• Use braces: Wear an ankle brace during high-risk activities after a sprain
• Proper footwear: High-top shoes provide additional support
• Proprioception exercises: Eyes-closed balance and reaction drills
• Warm up thoroughly: Before sports and exercise
• Address the first sprain: Seek proper treatment even for "minor" sprains

If your ankle repeatedly gives way or you've had multiple sprains, don't wait for further damage to occur. Schedule an evaluation with our ankle instability specialists. We offer same-day appointments and complimentary MRI reviews.