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The Sprain That Won't Heal

Peroneal Tendon Injuries in Athletes

Months after an ankle sprain, the outside of your ankle still aches. It swells after runs. It pops or snaps behind the ankle bone. That story — more often than people realize — is not a sprain at all. It's a peroneal tendon problem, one of the most commonly missed diagnoses in the ankle.

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By Victor R. Prisk, MD, FAAOS — Board-Certified Orthopaedic Surgeon, Foot & Ankle Fellowship (HSS) · Last updated August 2026

At a Glance

Best for
Tears, tendinitis, subluxation
Key test
Dynamic ultrasound, in office
Surgery
Outpatient — home same day
Early phase
Boot, first weeks
Therapy
Within the first month
Return to sport
Roughly 3–4 months

The Anatomy

Three Ways These Tendons Fail

Two tendons — the peroneus brevis and peroneus longus — run in a groove behind the outside ankle bone and turn the foot outward. They're your ankle's dynamic stabilizers: every cut, landing, and push-off asks them to fire.

  • Tendinitis and tendinosis — overuse injury of the tendon and its sheath; the most likely to settle with proper rehab
  • Split tears — lengthwise fraying of the tendon that generally does not heal on its own, because the tendon is loaded with every step
  • Subluxation or dislocation — the tendons snap out of their groove after the retinaculum that holds them down has torn

Peroneal problems love company. They frequently travel with chronic ankle instability and with a high-arched (cavovarus) foot shape that overloads the outside of the ankle.

Is It Actually the Tendon?

Signs to Stop Ignoring

  • A "sprain" not clearly better by 6–8 weeks
  • Pain or swelling behind the outside ankle bone
  • Popping or snapping over the ankle bone
  • Pain pushing the foot outward

The Diagnosis

Seen in Motion, Not Guessed At

The exam points the way: tenderness along the tendons behind the fibula, pain with resisted eversion, sometimes a visible snap. Then I confirm it in our Monroeville office — usually in one visit.

Dynamic ultrasound

The key test for subluxation — it watches the tendons move in real time while you reproduce the snap.

MRI

Defines split tears and tendon quality, and rules out the mimics.

Weight-bearing CT

Measures your standing heel alignment — an uncorrected cavovarus heel can sabotage a tendon repair.

The Treatment

Conservative First. Honest Always.

Tendinitis often settles with a structured plan: activity modification, bracing or a boot, and progressive strengthening with our on-site P.O.W.ER physical therapy team. When tendinosis lingers, I use ultrasound-guided biologic options such as PRP in select cases rather than cortisone — repeated steroid injections into a weight-bearing tendon can weaken it further.

But I'll be straight with you: a true split tear or recurrent subluxation rarely fixes itself. When surgery is the right call, the operation is matched to the injury:

Debridement & tubularization

Cleaning the damaged tissue and re-rounding a split tendon so it glides instead of catching.

Retinaculum repair with groove deepening

For subluxation — rebuild the roof and deepen the floor of the tendons' tunnel so they stay put.

Combined procedures

When instability or alignment problems coexist, I address them in the same operation — fixing the tendon while ignoring the cause invites failure. Full details in my peroneal tendon guide.

Why P.O.W.

Tendons Their Careers Depend On

I'm a fellowship-trained foot and ankle surgeon (Hospital for Special Surgery), a former NCAA All-American gymnast, and a physician for Pittsburgh professional ballet dancers — athletes whose careers ride on these exact tendons.

  • Ultrasound, MRI coordination, and weight-bearing CT under one roof
  • Independent practice — operating privileges at both AHN and UPMC facilities
  • Written, week-by-week recovery plan for every patient

Hurt at Work?

Peroneal injuries from falls and ladder accidents are classic work injuries. We treat workers' compensation cases and provide independent medical examinations.

The Comeback

Recovery, Step by Step

  1. Same-day surgery

    Home within hours, protected in a boot or splint.

  2. Protected healing

    Boot protection early; therapy begins within the first month.

  3. Strength & balance

    Progressive eversion strengthening and proprioception with the P.O.W.ER team.

  4. Return to sport

    Most patients return in roughly 3–4 months; groove-deepening and combined procedures run on the longer end.

Questions Patients Ask

Peroneal Tendons, Answered

How do I know if it's a peroneal tendon tear and not just a sprain?
Sprains improve steadily over weeks. Peroneal problems linger: pain and swelling behind the outside ankle bone, pain pushing the foot outward, or popping and snapping. If a "sprain" is not clearly better by 6–8 weeks, the tendons deserve a real look.
Can a peroneal tendon tear heal on its own?
Tendinitis can settle with proper rehab. True split tears generally do not heal on their own — the tendon is under load with every step. That doesn't always mean surgery, but it does mean an accurate diagnosis.
What does the snapping on the outside of my ankle mean?
Snapping behind the fibula often means the tendons are subluxing — slipping out of their groove because the retinaculum has torn. Dynamic ultrasound in our office can show it happening in real time.
Do you inject cortisone for peroneal tendinitis?
I avoid repeated cortisone around weight-bearing tendons because it can weaken them. I prefer structured rehab first and, in select chronic cases, ultrasound-guided biologic options such as PRP.
How long is recovery after peroneal tendon surgery?
Most patients are protected in a boot early, begin therapy within the first month, and return to sport in roughly 3–4 months depending on the procedure.
Is this covered by insurance?
We are in-network with Highmark/BCBS, UPMC, Aetna, Cigna, United, most Medicare plans, and others. Call the office to confirm your specific plan.

Prisk Orthopaedics and Wellness

Stop Guessing About the Outside of Your Ankle

If your "sprain" is still not right, get the actual diagnosis.

Request an AppointmentCall (412) 525-7692

2490 Mosside Blvd, Monroeville, PA 15146  ·  Serving Pittsburgh, Monroeville, Murrysville, Plum, Penn Hills & Greensburg  ·  Insurance accepted