The Achilles tendon is the connection between the heel and
the most powerful muscle group in the body. This has long been known
as a site which is prone to disabling injury. Forces up to 12 times
body weight (9kN) may arise during sprinting.
The tendon can swell and may cause pain. This condition is common in athletes, runners and patients who have calf tightness. Achilles tendinosis may occur in the middle of the tendon. This is known as midsubstance Achilles tendinosis. It may also occur at the point where the tendon connects to the heel bone.