The Achilles tendon is the largest tendon in the human body and can withstand forces of 1,000 pounds or more. It also is the most frequently ruptured tendon, usually as a result of a sports injury. Both professional and weekend athletes may suffer from Achilles tendonitis, a common overuse injury and inflammation of the tendon.
Events that can cause Achilles tendonitis may include:
- Hill running or stair climbing.
- Overuse, stemming from the natural lack of flexibility in the calf muscles.
- Rapidly increasing mileage or speed when walking, jogging, or running.
- Starting up too quickly after a layoff in exercise or sports activity, without adequately stretching and warming up the foot.
- Trauma caused by sudden and/or hard contraction of the calf muscles when putting out extra effort, such as in a sprint.
- Improper footwear and/or a tendency toward over-pronation.