Peroneal Tendinitis

What is peroneal tendinitis?

The peroneal tendons run behind the outer ankle and along the side of the foot. They help steady the ankle and control side to side motion. Overuse, a sprain, or foot shape can irritate these tendons.

Common symptoms

• Pain behind or below the outer ankle bone
• Swelling along the outside of the ankle
• Pain that increases with walking or exercise
• Weakness or a feeling that the ankle is unstable

A tendon tear, tendon slipping, ankle sprain, or fracture can cause similar symptoms.

Why it happens

Running on sloped surfaces, a sudden increase in activity, repeated ankle rolling, and high arched feet can place extra load on the peroneal tendons. The condition may also follow an injury that did not fully recover.

How we evaluate outer ankle tendon pain

We check the path of both tendons, ankle stability, foot structure, and strength. X-rays can look for bone injury or alignment concerns. Ultrasound or MRI may be used if a tear or tendon instability is suspected.

Treatment options

Early care often focuses on reducing strain and restoring stability. It may include:

• Activity changes and supportive shoes
• An ankle brace or walking boot
• Ice and medication when appropriate
• Physical therapy for strength and balance
• Custom orthotics for contributing foot mechanics
• Surgery for selected tendon tears or instability

Ignoring persistent outer ankle pain can allow weakness and instability to continue.

When to schedule an appointment

Schedule an evaluation if pain follows a sprain, causes limping, or returns whenever activity increases. Sudden severe pain or an inability to walk needs prompt care.

Frequently asked questions

Is this the same as an ankle sprain?

No, but they often occur together. A sprain affects ligaments, while peroneal tendinitis affects tendons along the outer ankle.

Can I run with peroneal tendon pain?

Continuing to run through pain may worsen the irritation. A temporary change in activity is often recommended while the cause is addressed.

Why does foot shape matter?

A high arch or other alignment pattern can shift more pressure to the outside of the foot and increase tendon workload.

How to prepare for your appointment

Bring your usual walking or athletic shoes and any prior imaging. Note where the pain begins, which activities affect it, whether an injury occurred, and what treatments you have already tried.

Related care

You may also want to explore diagnostic ultrasound, bracing and walking boots, and shockwave therapy.

Foot and ankle care close to home

Signature Foot and Ankle provides personalized care at our Boynton Beach and Loxahatchee offices. Call 561 203 9285 or request an appointment online.