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Peroneal Tendon Injury

The peroneal tendons (peroneus longus and brevis) run behind the outer ankle bone, stabilising the foot and everting the ankle on uneven ground. Over-use, ankle sprains, or anatomic crowding can inflame, tear, or sublux these tendons—causing chronic lateral-ankle pain that is frequently mistaken for a “nagging sprain.” Our board-certified podiatrists deliver ultrasound-guided diagnosis, evidence-based rehabilitation, and, when required, minimally invasive tendon repair or groove-deepening to restore pain-free stability.

Pathophysiology & Risk Factors

Mechanical Over-load Anatomic Predisposition Stability Implication
Repetitive cutting or hill running Shallow retromalleolar fibular groove Corticosteroid injection into tendon sheath
Acute inversion ankle sprain with forceful eversion Low-lying peroneus brevis muscle belly crowding sheath Chronic lateral-ankle instability
Cavus (high-arch) foot → increased lateral load Os peroneum / hypertrophic tubercle crowding tendon Fluoroquinolone antibiotic use

Micro-tears or sheath irritation progress to tendinosis; severe overload may split the brevis or dislocate both tendons over the fibula.

Clinical Presentation

  • Achy or sharp pain behind/below the lateral malleolus
  • Swelling or snapping sensation when turning the ankle outwards
  • Weak eversion or feeling ankle gives way on uneven ground
  • Pain that flares with side-to-side sports or uphill running—relieved by rest
  • In chronic cases, visible hind-foot varus from cavus foot mechanics

Diagnostic Work-Up

  • Dynamic ultrasound – visualises tendinosis, split tears, and real-time subluxation.
  • Weight-bearing AP/lateral X-ray – assesses hind-foot alignment; rules out os peroneum fracture.
  • MRI – quantifies tear length, detects intrasheath fluid, and spring-ligament status.
  • Stress examination – evaluates concurrent lateral-ligament laxity.

Evidence-Based Management

Conservative (≈ 70 % success) Minimally Invasive / Surgical
CAM boot 3–4 wks for acute flare Tendon debridement & tubularisation for ≤ 50 % thickness tear
Custom orthotic with lateral wedge or cuboid post Groove deepening + retinacular repair for recurrent subluxation
Physical therapy: eccentric eversion-strength, balance drills Peroneus brevis → longus transfer if brevis non-repairable
NSAIDs / ice massage; avoid hill running Excision of hypertrophic tubercle / os peroneum impingement
Ultrasound-guided peroneal-sheath corticosteroid (single, judicious) Lateral-ankle ligament reconstruction (Broström) if instability co-exists

Prospective series report ≥ 80 % pain relief with six-week immobilisation + strengthening for tendinosis; surgical repair yields 90 % return-to-sport when tear or subluxation persists.

Treatment Philosophy

  • Mechanical root-cause first We correct cavus or ligament laxity alongside tendon repair to prevent recurrence.
  • Ultrasound on every injection & intra-op mapping Ensures precise medication placement and minimal tendon trauma.
  • Step-wise escalation Boot → therapy → one judicious injection → surgery only when structural failure or subluxation documented.
  • Athlete-specific rehab Return-to-run protocol when pain-free hop test and 5 / 5 eversion strength are achieved.

Frequently Asked Questions

Peroneal pain sits behind the outer ankle bone and worsens with eversion (pushing the foot outward). Ultrasound pinpoints the exact tendon involved.

Partial (< 50 %) tears often scar down with immobilisation and progressive loading. Larger splits or those that subluxate usually need surgical repair.

Most patients begin treadmill walking at 6 wks, light jogging at 10–12 wks, and full sport-specific drills by 4–5 months, depending on repair size and concomitant procedures.

Lateral-Ankle Pain Isn’t “Just a Sprain”

If outer-ankle aching or snapping persists beyond a typical sprain timeline, schedule a focused evaluation with North Texas Podiatry Associates. We’ll map your peroneal tendons with ultrasound and craft a personalised plan—from bracing to precision repair—for steady, pain-free steps.

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