Peroneal Tendinitis

Peroneal tendinitis most commonly develops as a result of overuse. Repetitive stress placed on the tendons can cause microscopic damage over time, leading to inflammation and pain. Activities that require repeated ankle motion, especially on uneven surfaces, can increase strain on the tendons.

Several factors may increase the risk of developing peroneal tendinitis. Individuals who suddenly increase their exercise intensity, duration, or frequency may place excessive stress on the tendons before they have time to adapt. Running on sloped terrain or uneven ground can also increase the workload of the peroneal tendons.

Ankle instability is another common contributing factor. Patients who have experienced one or more ankle sprains may develop chronic instability, forcing the peroneal tendons to work harder to stabilize the joint. Over time, this increased demand can lead to tendon irritation.

Certain foot structures may also predispose individuals to peroneal tendinitis. People with high arches often place greater stress on the outside of the foot and ankle, increasing strain on the peroneal tendons. Improper footwear, poor training techniques, and muscle imbalances may further contribute to the development of the condition.

In some cases, peroneal tendinitis may occur following a direct injury to the ankle or foot. Less commonly, tendon degeneration associated with aging can weaken the tendons and make them more susceptible to injury.

The symptoms of peroneal tendinitis often develop gradually and may worsen over time if the underlying cause is not addressed. Most people experience pain along the outside of the ankle, just behind the bony bump on the outer ankle. Some individuals may also notice pain that extends down the outside of the foot.

The discomfort may initially occur only during physical activity but can progress to pain during everyday activities such as walking or climbing stairs. Many patients report that symptoms worsen with running, jumping, or prolonged standing.

Additional symptoms may include:

• Tenderness along the outside of the ankle
• Swelling around the affected tendons
• Warmth or inflammation in the area
• Pain when turning the foot outward
• A feeling of weakness or instability in the ankle
• Stiffness after periods of rest
• Pain that increases after exercise

In some cases, patients may notice a snapping or popping sensation around the outside of the ankle. This can occur when the tendons become irritated or move abnormally within their groove behind the fibula.

Because the symptoms can resemble those of an ankle sprain, stress fracture, or other foot and ankle conditions, a thorough evaluation is important for obtaining an accurate diagnosis.

Diagnosis begins with a detailed medical history and physical examination. An orthopedic specialist will discuss the patient’s symptoms, activity level, prior injuries, and any recent changes in exercise or physical activity.

During the examination, your Orthopedic Associates of Northern California clinician will evaluate the foot and ankle for swelling, tenderness, weakness, and instability. Specific movements may be performed to determine whether the peroneal tendons are the source of pain. The physician will also assess foot alignment and ankle mechanics to identify any contributing factors.

Imaging studies are often used to confirm the diagnosis and rule out other conditions. X-rays may be obtained to evaluate the bones of the foot and ankle and to identify fractures, arthritis, or structural abnormalities.

Advanced imaging such as magnetic resonance imaging (MRI) provides detailed visualization of the tendons and surrounding soft tissues. MRI can help identify inflammation, tendon degeneration, partial tears, or other tendon injuries. Ultrasound imaging may also be used to assess tendon movement and evaluate for tendon damage.

An accurate diagnosis is essential because untreated peroneal tendon disorders can progress and potentially lead to tendon tears or chronic ankle instability. Early evaluation by an orthopedic specialist can help identify the condition and determine the most appropriate course of care.