The Achilles tendon is the largest tendon in the human body and can withstand forces of 1,000 pounds or more. But it also the most frequently ruptured tendon.
Both professional and weekend athletes can suffer from Achilles tendinitis, a common overuse injury and inflammation of the tendon.
Common Disorders of the Achilles Tendon
What Is the Achilles Tendon?
A tendon is a band of tissue that connects a muscle to a bone. The Achilles tendon- the longest tendon in the body runs down the back of the lower leg and connects the calf muscle to the heel bone. Also called the "heel cord," the Achilles tendon facilitates walking by helping to raise the heel off the ground.
Achilles Tendonitis and Achilles Tendonosis
Two common disorders that occur in the heel cord are Achilles tendonitis and Achilles tendonosis. Achilles tendonitis is an inflammation of the Achilles tendon. This inflammation is typically short-lived. Over time the condition usually progresses to a degeneration of the tendon ( Achilles tendonosis), in which the tendon loses its organized structure and is likely to develop microscopic tears. Sometimes the degeneration involves the site where the Achilles tendon attaches to the heel bone. In rare cases, chronic degeneration with or without pain may result in rupture of the tendon.
The symptoms associated with Achilles tendonitis and tendonosis include:
- Pain-aching, stiffness, soreness, or tenderness within the tendon. This may occur anywhere along the tendons path, beginning with the narrow area directly above the heel upward to the region just below the calf muscle. Often pain appears upon arising in the morning or after periods of rest, then improves somewhat with motion but later worsens with increased activity.
- Tenderness, or sometimes intense pain, when the sides of the tendon are squeezed. There is less tenderness, however, when pressing directly on the back of the tendon.
- When the disorder progresses to degeneration, the tendon may become enlarged and may develop nodules in the area where the tissue is damaged.
As "overuse" disorders, Achilles tendonitis and tendonosis are usually caused by a sudden increase of a repetitive activity involving the Achilles tendon. Such activity puts too much stress on the tendon too quickly, leading to micro-injury of the tendon fibers. Due to this ongoing stress on the tendon, the body is unable to repair the injured tissue. The structure of the tendon is then altered, resulting in continued pain.
Athletes are at high risk for developing disorders of the Achilles tendon. Achilles tendonitis are also common in individuals whose work puts stress on their ankles and feet, such as laborers, as well as in weekend warriors those who are less conditioned and participate in athletic only on weekends or infrequently. In addition, people with excessive pronation (flattening of the arch) have a tendency to develop Achilles tendonitis and tendonosis due to the greater demands placed on the tendon when walking. If these individuals wear shoes without adequate stability, their over-pronation could further aggravate the Achilles tendon.
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