Abstract
Determination of the aged human bone stability is very important when arranging for rehabilitation. Usually, to determine the bone stability, surgeons inspect X-ray photographs by subjectively with their experiences. Thus, a clinically feasible method to determine the bone stability is awaited. We have attempted to develop such a method for quantitative evaluation of the stability by image processing X-ray photographs. As a result, we successfully established the method for quantitative evaluation of the aged bone stability.