Dictionary Definition

hyperextension n : greater than normal extension

User Contributed Dictionary

English

Noun

the extension of a joint beyond its normal range; the condition of being hyperextended

Extensive Definition

Extension is a movement of a joint. For example, extension is produced by extending the flexed elbow. The arm is now straight; it has been extended. If the head is tilted all the way back, it is said to be extended.

The movement in the opposite directions is called flexion. Flexion decreases the angle between the bones of the limb at a joint, while extension increases it.

With the foot, extension (elevation) is usually called dorsiflexion.

If a part of the body is overstretched, then one speaks of a '''hyperextension (as with the knee).Hyperextension is when the joint is forced the opposite way of the usual motion.

In some anatomical muscle names, particularly with muscles of the forearm and the Cnemis, the term occurs explicitly as the second word in the Latin spelling of the name (for example, Musculus extensor carpi ulnaris).