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*Vertical Impact Increase In Middle Age May Explain Weight-bearing Joint Osteoarthritis

TITLE: Vertical Impact Increase in Middle Age May Explain Idiopathic Weight-bearing Joint Osteoarthritis 2001-1.pdf

Accessible Summary:

Purpose:  To test the hypothesis that ground reaaction force increases with age - an explanation of idiopathic osteoarthritis of the hip in humans.

Synopsis: Ground reaction force was measured while subjects performed a standard stepping task in young and older subjects.  Ground reaction force when stepping was found to increase with advanvcing years.  This increase may be explained by decline in plantar tactile sensibility.  This may lead to impaired postural stability and behavior that amplifies impact in relation to instability. 

Significance: This was the first report to show increase in vertical impact with advancng years.  It may help explaining the rise in idiopathic hip osteoarthritis that occurs in late middle age.