Abstract
We performed a three-point bending test and a torsional test using chicken bones to determine which type of testing is best suited to the evaluation of bone strength after medical treatment. Although the torsional test simulates the real bone fracture well, the coefficient of variation was larger than bending test and breaking location was not the same part to many bones. We then used the three-point bending test to investigate bone strength after a medical treatment and clarified that the bone strength has a high probability of decreasing.