Those who are affected by osteo-arthritis typically have issues with completing seemingly simple tasks like walking or bending down for groceries. 

While the pain is definitely present, doctors are unable to diagnose the chronic condition until it's interfered with everyday activities. 

But researchers from Duke University are learning that the damage in the bones can start up to eight years before an X-ray picks it up. 

For a better understanding, KCBS Radio anchors Bret Burkhart and Patti Reising were joined by Virginia Byers Kraus, Lead author of the study and a professor of medicine at Duke University.