4 doctors weighed in:
What does it mean to hyper-extended your knee?
4 doctors weighed in

Danielle Jones
Obstetrics & Gynecology
2 doctors agree
In brief: Injured by extension
Hyperextension means over-extension, or straightening a knee joint beyond the straight position.
If one straightens out his leg, it stops approximately straight, which is normal. If his lower leg and foot continues moving past the straight point, that is called hyperextension. At first, knee ligaments will over-stretch, with a little bleeding. Further extension will tear up the ligaments.

In brief: Injured by extension
Hyperextension means over-extension, or straightening a knee joint beyond the straight position.
If one straightens out his leg, it stops approximately straight, which is normal. If his lower leg and foot continues moving past the straight point, that is called hyperextension. At first, knee ligaments will over-stretch, with a little bleeding. Further extension will tear up the ligaments.
Danielle Jones
Danielle Jones
Answer assisted by Danielle Jones, Medical Student
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Dr. Thomas Deberardino
Orthopedic Surgery
1 doctor agrees
In brief: Bend beyond straight
A fully extended knee usually gets to the straight position or perhaps a few degrees past straight.
A hyperextended knee occurs when the knee goes beyond the patient's normal amount of full extension. Hyperextension of the knee can result in significant pain and injury. Evaluation by your physician is usually recommended.

In brief: Bend beyond straight
A fully extended knee usually gets to the straight position or perhaps a few degrees past straight.
A hyperextended knee occurs when the knee goes beyond the patient's normal amount of full extension. Hyperextension of the knee can result in significant pain and injury. Evaluation by your physician is usually recommended.
Dr. Thomas Deberardino
Dr. Thomas Deberardino
Thank
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