Causes of Achilles Tendon RuptureThe exact cause of Achilles tendon ruptures is hard to say. It can happen suddenly, without warning, or following an Achilles tendonitis. It seems that weak calf muscles may contribute to problems. If the muscles are weak and become fatigued, they may tighten and shorten. Overuse can also be a problem by leading to muscle fatigue. The more fatigued the calf muscles are, the shorter and tighter they will become. This tightness can increase the stress on the Achilles tendon and result in a rupture.
Additionally, an imbalance of strength of the anterior lower leg muscles and the posterior lower leg muscles may also put an athlete at risk for an injury to the Achilles tendon.
An Achilles tendon rupture is more likely when the force on the tendon is greater than the strength of the tendon. If the foot is dorsiflexed while the lower leg moves forward and the calf muscles contract, a rupture may occur. Most ruptures happen during a forceful stretch of the tendon while the calf muscles contract.
Signs and Symptoms of Achilles Tendon Rupture
A classic sign of an Achilles tendon rupture is the feeling of being hit in the Achilles are. There is often a "pop" sound. There may be little pain, but the person can not lift up onto his toes while weight bearing.