Rolled Your Ankle Again — or Is It Giving Way on Its Own?

Ankle sprains are one of the most common injuries across every age group and activity level. Most people roll through one, rest for a few days, and go back to normal. And then it happens again. And again. That pattern — repeated sprains, a sense that the ankle gives way unpredictably, persistent aching or instability — is chronic ankle instability, and it is not something to keep working around.

The problem is almost always the same: the first sprain was never fully rehabilitated. The ligaments healed, but the neuromuscular control and peroneal muscle strength that prevent re-injury were never restored. Every subsequent sprain happens faster and with less provocation because the ankle is progressively less able to protect itself. Our podiatrists treat acute ankle sprains and chronic ankle instability at our Coon Rapids and Golden Valley offices, serving patients across the north and west metro including Maple Grove, Ham Lake, Andover, Champlin, Blaine, Plymouth, Wayzata, Minnetonka, St. Louis Park, and Edina.

If you cannot bear weight for four steps after an ankle injury, have bony tenderness along the outer ankle bone or the base of the fifth metatarsal, or have significant swelling and bruising that is worsening rather than improving — get evaluated before starting any rehabilitation. These signs may indicate a fracture rather than a sprain.

Call 763-421-7300 or book online

What Is a Lateral Ankle Sprain?

A lateral ankle sprain occurs when the foot rolls inward (inversion), stretching or tearing the ligaments on the outer side of the ankle. The most commonly injured ligament is the anterior talofibular ligament (ATFL), which connects the fibula to the talus bone. In more significant sprains the calcaneofibular ligament (CFL) is also involved.

Sprains are graded by severity:

• Grade I: ligament fibers are stretched but intact. Mild swelling and tenderness, can walk with a limp. Recovers in 1-3 weeks in healthy patients.
• Grade II: partial tear of the ATFL and sometimes the CFL. Moderate swelling and bruising, pain with weight-bearing, possible feeling of looseness. Recovers in 3–6 weeks with proper rehabilitation, longer with comorbidities or in older patients.
• Grade III: complete rupture of one or more lateral ligaments. Severe swelling and bruising, inability to bear weight, significant instability. Requires 6–12 weeks or more and often needs imaging to rule out fracture and possible surgical evaluation.

Recovery timelines vary significantly based on age, overall health, and whether comorbidities such as diabetes, obesity, or peripheral vascular disease are present. The timelines above reflect healthy, active patients. All patients should progress through rehabilitation based on clinical criteria rather than calendar dates.

What Is Chronic Ankle Instability?

Chronic ankle instability (CAI) develops when lateral ankle sprains are not fully rehabilitated. It is defined as recurrent sprains, a persistent sense of giving way, and subjective feelings of instability lasting longer than 12 months after the initial injury. The ankle may give way on flat ground, on uneven surfaces, during stair climbing, or with changes in direction.

Two mechanisms drive CAI:

• Mechanical instability: the ligaments healed in a lengthened position or failed to heal with adequate tensile strength, leaving the ankle structurally loose.
• Functional instability: the proprioceptive nerve fibers within the ligaments were damaged during the sprain and never fully recovered, leaving the ankle’s reflexive protective response impaired. The muscles cannot react fast enough to prevent a roll because the sensor network that triggers that response is compromised.

Most patients with CAI have both components to varying degrees. The distinction matters for treatment: functional instability responds very well to structured rehabilitation and bracing. Mechanical instability may require bracing, modified orthotics, or surgical stabilization if rehabilitation does not restore adequate function.

A note on PTTD: chronic ankle instability and posterior tibial tendon dysfunction can be correlated. Repeated ankle sprains and lateral instability can change the mechanics of the entire hindfoot over time, which may progressively increase the load on the posterior tibial tendon. If your ankle instability is accompanied by flattening of the arch or pain along the inner ankle, a combined assessment is important. See our Adult-Acquired Flatfoot (PTTD) page.

What Causes Chronic Ankle Instability?

The most common cause is inadequate rehabilitation after an acute lateral ankle sprain — returning to normal activity once pain has resolved, without completing the proprioception and strengthening phases that restore the ankle’s neuromuscular protection. Other contributing factors:

• Repeated ankle sprains without structured rehabilitation between each episode
• High-arched (cavus) foot structure, which predisposes the ankle to inversion with every step
• Peroneal muscle weakness — the peroneals are the primary dynamic stabilizers against lateral ankle rolling and are almost always compromised in CAI
• Subtalar joint hypermobility, which increases inversion range and reduces the ankle’s mechanical resistance to rolling
• Previous Grade III sprain with complete ligament rupture that was not surgically repaired or was inadequately rehabilitated
• Participation in sports with high inversion injury risk — basketball, volleyball, trail running, soccer, tennis

Symptoms of Ankle Sprains & Chronic Instability

Acute Ankle Sprain

• Sudden pain at the time of injury with an inversion mechanism — rolling the foot inward
• Swelling and bruising along the outer ankle, developing within hours of injury
• Tenderness to touch along the ATFL (front of the outer ankle bone) and CFL (below the outer ankle bone)
• Difficulty or inability to bear weight depending on grade
• Stiffness and reduced range of motion in the hours and days following injury

Chronic Ankle Instability

• Recurrent ankle sprains, often with progressively less provocation
• A persistent sense that the ankle may give way, particularly on uneven ground, stairs, or with lateral movement
• Chronic aching or swelling after activity that is otherwise normal
• Reduced confidence in the ankle during sport, exercise, or even routine walking
• Stiffness or pain at the start of activity that warms up but returns after

When to seek evaluation beyond a basic sprain: pain at the base of the fifth metatarsal (the bony prominence on the outer midfoot) after an inversion injury may indicate a fracture rather than a sprain. Inability to bear weight for four steps, bony tenderness along the outer ankle bone or the inner ankle bone, and severe swelling with rapid onset are all indicators that imaging is needed before starting rehabilitation.

How Are Ankle Sprains and Chronic Instability Diagnosed?

Diagnosis of an acute sprain is primarily clinical — a hands-on examination, assessment of swelling and tenderness location, range of motion testing, and ligament stress tests. The anterior drawer test assesses ATFL integrity; the talar tilt test assesses CFL and overall lateral ligament complex stability. We also assess the fibula, base of the fifth metatarsal, and navicular bone for tenderness, following the Ottawa Ankle Rules to determine whether imaging is needed.

For chronic ankle instability, we may additionally evaluate:

• Single-leg balance and proprioception — quantifying how impaired the ankle’s reflexive control is compared to the unaffected side
• Peroneal muscle strength — manual and resisted testing of eversion strength, which is almost universally reduced in CAI
• Subtalar motion and hindfoot alignment — particularly relevant if PTTD or Pes Cavus foot structure is a concurrent concern

Imaging used when indicated:

• X-ray — to rule out fracture acutely; weight-bearing views for alignment assessment in chronic cases
• Diagnostic ultrasound — may be performed in-office for assessment of the ATFL and peroneal tendons, which are commonly injured alongside lateral ankle sprains
• MRI — for closer evaluation of the underlying soft tissues, particularly if suspected peroneal tendon tears, osteochondral lesions of the talus, or pre-surgical planning in CAI

Treatment Options at Family Foot & Ankle Clinic

Treatment is tailored to whether we are managing an acute sprain or established chronic instability, and to the patient’s grade, activity level, age, and overall health.

Tier 1 — Acute Sprain: POLICE Protocol & Early Rehabilitation

POLICE, not RICE. The current evidence-based standard replaces complete Rest with Optimal Loading — early, pain-free movement and controlled weight-bearing accelerate healing and reduce long-term dysfunction. Protection with a functional brace, Optimal Loading through early movement, Ice, Compression, and Elevation in the first 48–72 hours.

Structured home rehabilitation program. The most important thing we give acute sprain patients is a complete, phased rehabilitation program covering all four stages: acute care, strengthening, proprioception training, and return to activity. Most ankle sprains that become chronic instability do so because rehabilitation stopped after the pain resolved. We give every sprain patient a complete home rehab program at their visit — see the download below.

Functional bracing. A lace-up ankle brace from day one is more effective than immobilization for all grades of lateral ankle sprain. We prescribe the appropriate brace type for the grade and monitor the transition from acute-phase bracing (during all weight-bearing) to sport-specific prophylactic bracing (during high-demand activity for 6 months after Grade II, 12 months after Grade III).

NSAIDs. Short-term use for pain and swelling management in the acute phase. Best tapered after the first week as the rehabilitation program begins, since prolonged NSAID use may theoretically interfere with ligament healing.

Tier 2 — Chronic Instability: Advanced Conservative Care

Structured rehabilitation for CAI. The same four-phase program applies, but with greater emphasis on proprioception training, peroneal strengthening, and neuromuscular re-education. For established CAI, the balance and proprioception phase needs to continue for significantly longer than for an acute sprain — research supports 6–12 weeks of dedicated proprioception training to meaningfully reduce re-injury risk.

Custom orthotics. For patients with a high-arched foot type or subtalar hypermobility contributing to repeated inversion injury, a custom orthotic with lateral wedging and rearfoot control addresses the structural predisposition to rolling. More on our Custom Orthotics page.

Ankle bracing for sport and activity. Long-term prophylactic ankle bracing during sport significantly reduces recurrent sprain rates in patients with CAI. A lace-up brace worn during all high-demand activity provides both mechanical support and enhanced proprioceptive feedback through skin contact with the brace.

Physical therapy. A supervised PT program accelerates proprioception recovery and provides sport-specific neuromuscular training that a home program alone cannot replicate for more advanced CAI patients.

Peroneal tendon evaluation. Chronic lateral ankle instability and peroneal tendon tears frequently coexist. If peroneal pain or weakness is prominent alongside instability, a specific peroneal tendon evaluation is important. See our Peroneal Tendon Injuries page.

Tier 3 — Advanced Options

Shockwave therapy (EPAT) — for peroneal tendinopathy alongside CAI. When chronic ankle instability is accompanied by peroneal tendinopathy — inflammation and degeneration of the peroneal tendons that run behind the outer ankle — shockwave therapy addresses the tendon component directly. It targets the chronically thickened and scarred tendon tissue that conservative care alone often cannot fully resolve, stimulating the body’s own healing response. Non-invasive, no surgery, no downtime, six sessions typically. Insurance does not cover shockwave; it is offered as a cash-pay service with package pricing available. → See our Shockwave Therapy (EPAT) page.

When Is Surgery Needed?

Surgery is considered for chronic ankle instability when:

• A structured course of conservative rehabilitation — including dedicated proprioception training and bracing — has been completed without producing adequate functional stability
• Mechanical instability is confirmed (positive anterior drawer or talar tilt under stress X-ray) in a patient who remains functionally limited
• A concurrent peroneal tendon tear or osteochondral lesion of the talus is present that requires surgical management

The most common surgical procedure for CAI is the modified Brostrom-Gould procedure — an anatomic ligament repair that tightens the ATFL and CFL back to their original length using suture anchors and reinforcement with local tissue. It has excellent outcomes for well-selected patients and allows return to sport in most cases at 4–6 months. For patients with more complex instability or significant joint involvement, additional procedures may be combined.

See our Foot & Ankle Surgery Overview for general information on what surgical care at our clinic involves.

Long-Term Care & Prevention

The most important prevention strategy is completing the full rehabilitation program after every ankle sprain — not stopping when the pain is gone. Beyond that:

• Wear a prophylactic ankle brace during sport and high-demand activity for 6 months after a Grade II sprain and 12 months after a Grade III sprain, even after completing rehabilitation
• Maintain peroneal strengthening and balance exercises as an ongoing maintenance circuit — proprioceptive deficits that predispose to re-injury do not resolve permanently without continued training
• Wear supportive footwear appropriate for your activity — high-heeled shoes, worn-out athletic shoes, and minimalist shoes on uneven terrain all increase inversion injury risk. See our Shoe Recommendations Guide.

• If you have a high-arched foot, discuss whether custom orthotics with lateral wedging are appropriate as a long-term structural intervention
• Return to our office at the first sign of a re-injury rather than managing it independently — early grading and early rehabilitation after a recurrent sprain is far more effective than waiting

Frequently Asked Questions

Do I need an X-ray for a sprained ankle?

Not always, but often. The Ottawa Ankle Rules guide this decision: an X-ray is indicated if you cannot bear weight for four steps after the injury, or if there is bony tenderness at the tip of the outer or inner ankle bone, or at the base of the fifth metatarsal. If none of those are present, imaging is generally not needed for an acute lateral sprain. We will make this determination at your visit.

How long should I wear a brace?

During the active rehabilitation period, the brace should be worn during all weight-bearing activity until the rehabilitation program is complete — typically 4–6 weeks for a Grade II sprain and 6–12 weeks for a Grade III. After that, continue wearing the brace during sport and vigorous activity for 6 months after a Grade II sprain and 12 months after a Grade III. The brace can come off for low-demand daily activity once the rehabilitation program is finished. Note that balance and proprioception exercises in Phase 3 of the rehab program should eventually be performed without the brace, to train the ankle’s own neuromuscular control rather than relying on the brace.

Can a sprained ankle ever fully heal, or will I always be prone to re-injury?

A fully rehabilitated ankle — one where the proprioception, peroneal strength, and neuromuscular control have been genuinely restored — can be functionally as stable as an uninjured ankle. The evidence is clear that structured rehabilitation reduces re-injury risk by up to 50%. The patients who remain permanently prone to re-injury are almost universally those who returned to full activity before completing the proprioception and strengthening phases of recovery.

My ankle keeps giving way even without a fall or twist. Is that different?

Yes — this is the defining feature of functional instability within chronic ankle instability. The ankle gives way because the proprioceptive reflex arc is damaged: the sensors that detect the roll and trigger the muscles to respond are slow or misfiring. This is specifically what Phase 3 of the rehabilitation program targets. It responds well to structured proprioception training and often does not require surgery.

Is it normal to have ankle pain for months after a sprain?

Prolonged pain after an ankle sprain — beyond 6–8 weeks for a Grade II or 3–4 months for a Grade III — warrants re-evaluation. It may indicate an osteochondral lesion of the talus (a cartilage or bone injury inside the joint), peroneal tendon involvement, syndesmotic injury (high ankle sprain), or simply undertreated chronic instability. These respond differently to treatment and need to be properly identified.

I have been dealing with ankle instability for years. Is it too late to rehabilitate it?

It is not. Even long-standing chronic ankle instability responds meaningfully to dedicated proprioception training and peroneal strengthening in many patients. If you have tried rehabilitation before without lasting improvement, or been told surgery is the only option, our Second Opinion / Foot Pain Not Improving visit is a useful starting point for an independent assessment.

Sprained Ankle, Chronic Instability, or Keeps Giving Way? Let’s Get It Stable.

Whether this is your first sprain or your fifteenth, the right evaluation and the right rehabilitation program make the difference between an ankle that recovers and one that keeps failing. Book an appointment at our Coon Rapids or Golden Valley office and we will assess exactly what is going on and build a plan to fix it.

Call 763-421-7300  |  Book online

Serving Coon Rapids, Golden Valley, Maple Grove, Champlin, Blaine, Plymouth, Andover, Wayzata, Minnetonka, Edina, and all Twin Cities communities.

Related Services & Conditions

• Custom Orthotics
• Shockwave Therapy (EPAT
• Peroneal Tendon Injuries
• Adult-Acquired Flatfoot (PTTD)
• Foot & Ankle Surgery Overview
• Second Opinion / Foot Pain Not Improving

Patient Resources

We give every ankle sprain patient a complete home rehabilitation program at their visit. All materials are available to download below: