hyperextend

As a noun ligament

is (anatomy) a band of strong tissue that connects bones to other bones.

As a verb hyperextend is

(medicine) to extend a joint beyond its normal position in a way that stresses the ligaments, often causing injury.

As verbs the difference between extend and hyperextend

is that extend is to increase in extent while hyperextend is (medicine) to extend a joint beyond its normal position in a way that stresses the ligaments, often causing injury.

As a verb hyperextend

is (medicine) to extend a joint beyond its normal position in a way that stresses the ligaments, often causing injury.

As a noun hyperextension is

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