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Extension of a bodily joint beyond its normal range of motion.

hy′per·ex·tend′ (-ĭk-stĕnd′) v.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Medicine) extension of an arm or leg beyond its normal limits
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌhaɪ pər ɪkˈstɛn ʃən)

the extension of a part of the body beyond normal limits.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.hyperextension - greater than normal extension
extension - act of stretching or straightening out a flexed limb
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
I suffered a fractured fibula on my right leg above my ankle, every muscle in my right leg from the knee down was strained (due to hyperextension upon landing from the air), and both ankles were severely sprained.
Exercises such as low leg lifts and leg rises (pictured above) cause hyperextension of the spine.
A few notable improvements were forward head posture, knee hyperextension, and foot-ankle pronation and supination.
It also protects neurological structures by preventing hyperextension of the elbow.
"Steff suffered an injury to his knee following the hyperextension against South Africa," said a Scarlets spokesperson.
Although hyperextension is one of the well-known risk factors for cervical disc herniation in accidents like a car crash, it is not well documented as one of the exposures for occupational settings.
On the Beighton score, she received all (9) scores: passive apposition of the thumb to forearm and passive dorsal hyperextension of the metacarpophalangeal joint >90[degrees] on both sides were done with no strain (Figure 2); she was able to actively hyperextend both elbows and knees on both sides over >10[degrees] and flex her spine to the ground with palms placed on the ground without knee flexing.
by four different mechanisms: 1) diffuse axonal injury duringacceleration/deceleration, 2) tentorium shear strain at the midbrain as a result of the damage caused by the cutting effect from the rigid nature of the tentorium, 3) injury of the neurovascular structures due to edge of tentorium, and 4) hyperextension of the cervical vertebrae injuringthe lower brain stem (9).
Likewise, hyperextension of the knees can push your weight into your heel, and also cause gripping.