How Clinicians Identify Achilles Tendinopathy: What Research Tells Us

Pain in the back of the heel or along the Achilles tendon is a common problem for runners, athletes, and active adults. This condition is often referred to as Achilles tendinopathy, which occurs when the tendon becomes irritated and less tolerant to the loads placed on it during daily activities and exercise.

But how do clinicians determine whether the Achilles tendon is truly the source of your pain?

A research study published in Foot & Ankle Surgery examined this question by evaluating which clinical tests are most helpful for identifying Achilles tendinopathy during a physical examination.

Understanding these tests can help patients better appreciate how clinicians arrive at an accurate diagnosis.

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Why Diagnosis Matters

Several conditions can cause pain in the back of the ankle, including:

• Achilles tendinopathy

• Retrocalcaneal bursitis

• Paratenon irritation

• Calf muscle strain

Because symptoms can overlap, a careful physical examination is essential. Accurate diagnosis ensures that treatment is directed toward the true source of the problem rather than simply addressing symptoms.

The study by Hutchison and colleagues evaluated several commonly used clinical tests and found that a combination of simple physical findings can be very helpful in identifying Achilles tendinopathy.

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Three Key Signs Clinicians Look For

Research suggests that three clinical findings together are particularly useful when diagnosing Achilles tendinopathy.

1. Localized Tendon Thickening

In many cases of Achilles tendinopathy, the tendon develops a thickened or swollen area along its length. This typically occurs in the middle portion of the tendon, a few centimeters above where it attaches to the heel bone.

During an examination, a clinician will gently feel along the tendon to determine whether there is a section that feels thicker than the surrounding tissue.

This thickening often reflects changes within the tendon caused by repeated overload over time.

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2. Localized Pain With Palpation

Another important sign is tenderness when the tendon is pressed.

Patients with Achilles tendinopathy often report pain when a specific spot on the tendon is palpated. This tenderness is usually quite localized rather than spread across the entire tendon.

Identifying this exact painful region helps clinicians determine where the tendon may be irritated.

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3. The Painful Arc Sign

The painful arc sign is another helpful clinical test.

When the ankle moves up and down, the Achilles tendon glides slightly beneath the skin. If the painful or thickened section moves along with the tendon during this motion, it suggests that the source of pain is within the tendon itself.

If the painful spot remains in the same place while the tendon moves, the pain may be coming from surrounding tissues rather than the tendon.

This distinction helps clinicians differentiate Achilles tendinopathy from other conditions that affect the back of the ankle.

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Why These Tests Are Helpful

The study found that these clinical signs—especially when present together—can provide strong evidence that Achilles tendinopathy is present.

Importantly, this means that advanced imaging is not always necessary for diagnosis. In many cases, a thorough physical examination combined with a detailed history is enough to identify the condition.

This allows treatment to begin sooner and focuses care on the factors that contribute to tendon irritation.

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What Happens After Diagnosis

Once Achilles tendinopathy is identified, treatment typically focuses on gradually restoring the tendon’s ability to tolerate load.

This may involve:

• Progressive calf strengthening

• Gradual return to activity

• Improving ankle mobility and movement mechanics

• Adjusting training or exercise volume

Because tendons adapt slowly, recovery usually occurs over weeks to months as the tendon becomes stronger and more resilient.

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The Importance of a Comprehensive Evaluation

While these clinical tests are helpful, they are only one part of the evaluation process. Clinicians also consider:

• Activity history

• Training patterns

• Strength and endurance of the calf muscles

• Walking or running mechanics

Looking at the whole picture helps ensure that treatment addresses both the symptoms and the underlying causes of tendon overload.

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Ready to Address Achilles Pain at the Source?

If you’re dealing with persistent pain in your Achilles tendon, a thorough evaluation can help determine whether Achilles tendinopathy is the cause and guide the right treatment approach.

Learn more about our Achilles Tendinopathy Program and book your evaluation to begin a personalized plan focused on restoring strength, reducing pain, and helping you return to the activities you enjoy.