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Achilles Tendon: Anatomy, Conditions and Treatment

The Achilles tendon is the strongest tendon in the human body, connecting the calf muscles to the heel bone. It is essential for walking, running, and jumping.

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Things worth knowing about "Achilles Tendon"

The Achilles tendon is the strongest tendon in the human body, connecting the calf muscles to the heel bone. It is essential for walking, running, and jumping.

What Is the Achilles Tendon?

The Achilles tendon (Latin: Tendo calcaneus) is the thickest and most powerful tendon in the human body. It connects the calf muscles -- the gastrocnemius and the soleus -- to the heel bone (calcaneus). The tendon is named after the Greek hero Achilles, whose only vulnerability, according to legend, was his heel.

The Achilles tendon enables fundamental movements such as pointing the foot downward (plantarflexion), pushing off during walking and running, and performing jumping movements. During physical activity, it can bear forces several times the body weight.

Anatomy and Function

The Achilles tendon is approximately 15 to 25 centimeters long and forms at the junction between the calf muscles and connective tissue. It runs along the back of the lower leg and attaches to the heel bone. Despite its strength, it is susceptible to injury because its blood supply -- especially in the middle section -- is relatively limited.

Common Conditions of the Achilles Tendon

Achilles Tendinopathy (Achilles Tendon Pain)

Achilles tendinopathy refers to pain in the area of the Achilles tendon, typically caused by overuse, improper loading, or degenerative changes. Common symptoms include pain in the morning or after prolonged sitting, as well as tenderness and pain when stretching the tendon.

Achilles Tendinitis (Tendon Inflammation)

Achilles tendinitis involves inflammatory or degenerative changes in the tendon. It is frequently caused by repetitive overuse, insufficient warm-up, improper footwear, or a sudden increase in physical activity. Symptoms include swelling, redness, warmth, and pain during movement.

Achilles Tendon Rupture

An Achilles tendon rupture refers to a complete or partial tear of the tendon. It commonly occurs during sports activities -- such as a sudden push-off or rapid acceleration. Affected individuals often report a loud popping sound followed by severe pain and the inability to flex the foot downward. Treatment may be surgical or conservative, followed by physiotherapy.

Diagnosis

Diagnosis of Achilles tendon conditions begins with a physical examination. The physician palpates the tendon and assesses the range of motion. Imaging techniques such as ultrasound or MRI (magnetic resonance imaging) can visualize the extent of damage and differentiate between inflammation, degeneration, and rupture.

Treatment

Conservative Treatment

Rest and reduced loading of the affected tendon
Ice application during acute inflammation
Physiotherapy with targeted stretching and strengthening exercises (e.g., eccentric training)
Orthopedic aids such as heel wedges or custom insoles
Anti-inflammatory medications (NSAIDs) for significant pain relief

Surgical Treatment

In cases of complete tendon rupture or chronic complaints resistant to conservative therapy, surgical intervention may be required. The tendon is sutured or reconstructed, and subsequent rehabilitation typically spans several months.

Prevention

To prevent Achilles tendon problems, it is recommended to regularly stretch and warm up before physical activity, gradually increase training intensity, wear appropriate footwear, and strengthen the calf muscles consistently.

References

Maffulli N., Sharma P., Luscombe K.L. - Achilles tendinopathy: aetiology and management. Journal of the Royal Society of Medicine, 2004.
German Society for Orthopaedics and Trauma Surgery (DGOU) - Guidelines for the treatment of Achilles tendon rupture, 2017.
World Health Organization (WHO) - Musculoskeletal conditions. Available at: https://www.who.int/news-room/fact-sheets/detail/musculoskeletal-conditions

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