The Knee Learning Resource
Injury from excessive hyperextension (knee bending backwards).
This may be caused by a blow to the upper inner part of the knee, forcing the knee backwards. Or it may be caused by catching the foot in something like a pothole or a tree stump while running, so the foot is caught but the body continues the momentum forwards.
In an hyperextension injury the forcible backward bending can cause damage to a number of structures -
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