Most of these cases are work-related. Obviously, there are things employers can do to reduce these costs. And there are things that individuals can do to prevent the pain for themselves. Companies could help by offering noontime lectures on developing stomach muscles. Individuals could make a decision to get themselves in shape to prevent the debilitating pain when one's back goes out.
Overweight people are much more likely to injure their backs.
There are other advantages to losing weight, but certainly preventing back injuries is a significant one. Organizations could help here by purchasing memberships in weight loss programs for staff. Learning to lift heavy objects properly. There are definitely better ways to lift objects than others. Again, it would be useful if companies offered noontime lectures on proper lifting techniques.