The Achilles tendon, stretching from the heel bone to the calf muscle, is one of the strongest and longest in the body. It is responsible for the ability to extend the foot and point the toes.

On average it is around 15 centimetres long and 6.1 mm in thickness in people aged 10-17 years, 6.3mm in people aged 18-30 years, and 6.9 mm in people aged over 30. It tends to be more flexible in women and the young, and is capable of supporting up to 12.5 times body weight.


Yet it is one that often suffers from injury. Tendonitis is an inflammation of the tendon, typically resolved quickly. When the injury lasts more than a month it may progress to a degeneration of the tendon, considered a tendonosis or tendinopathy. In this instance the tendon loses its organised structure and begins to suffer microscopic tears, further compromising its integrity.

Common Achilles tendon injuries

Up to 50% of ex-athletes aged over 45, and 10% of sedentary people, experience Achilles tendon injuries. These are usually the result of “overuse”, caused by a sudden increase in repetitive actions involving the Achilles tendon. Physical characteristics, such as over pronation and the use of shoes without adequate stability, can further aggravate the Achilles tendon and lead to injury.

Injuries to the Achilles tendon are painful and greatly reduce function. In the last few years there has been an increase in the number of ruptures of the Achilles tendons, due to the rise of the “weekend warrior”. These are generally sedentary, middle aged men who engage in vigorous sporting activity only on weekends. Another section of the population with a high incident of Achilles tendon injuries are people aged over 70.

What actions can lead to injury?

During sport, movements that can lead to Achilles tendon injuries include bursts of activity, such as start/stop and sprinting. Achilles ruptures can occur when:

  • There is a strong push off with the foot while the knee is locked or straightened by a strong thigh muscle
  • Steeping into an unseen hole, where the foot moves forward to stop the fall, suddenly over-stretching the Achilles tendon
  • A fall from some height

These force an unexpected and fast movement from a plantar flexion to a maximum dorsal flexion, leading to a break of the fibres. An injury to the Achilles tendon is usually painful, and if not treated correctly can degenerate to a chronic tendinopathy.

The biomechanics of the tendon during each step usually require the contraction of the fibres when the foot firstly contacts the floor, relaxes during the support stage, and returns to maximum strength when lifting off. Most Achilles tendon injuries typically occur between 2 to 6 centimetres from the heel.

Application of Percutaneous Electrolysis to Achilles tendon

EPTE® technique to Achilles tendons

A new solution to tendinopathies which is having great results is EPTE, percutaneous electrolysis therapy. Physiotherapists that currently apply the EPTE technique to Achilles tendons in Europe report faster recovery times and great success rates. A series of EPTE sessions, combined with eccentric exercises, contributes to the tendon’s repair.

Percutaneous Electrolysis Therapy reduces the need for surgery. The patient experiences minimal discomfort during an EPTE treatment due to the use of microcurrents. Shorter recovery times and more successful outcomes are being reported through the use of the EPTE technique.

Interesting Facts:

  • Philip Verheden, a famed anatomist and embalmer, is rumoured to have dissected his own amputated leg in the 17th Century.
  • The Achilles tendon name refers to the mythical Greek legend of Achilles. Achilles’ mother, Thetis, held her infant by his heels as she dipped him into the river Styx, to make him invincible. Unfortunately, the area he was held by became his only point of vulnerability, leading to the saying “Achilles heel”, to identify an individual’s weakness.
  • One of the characteristics of the Achilles tendon is the Kager fat pad, which surrounds the Achilles tendon. Oedema in Kager’s fat can be an indication of bone or soft tissue injury.