bone polar moment of inertia bone polar moment of inertia to body weight ratio 2013-05-07T18:42:39Z A calculated measurement in which the value of the polar moment of inertia is divided by the total weight or heaviness of the body and presented as a ratio, fraction, quotient or percentage, thus normalizing it to body weight. Polar moment of inertia is a calculated geometric property of a cross section of a bone which expresses the inherent rotational stiffness of the bone. It is a measure of the distribution of material around a given axis and is related to the inherent rotational stiffness of the bone around that axis. Bone is the hard, rigid form of connective tissue constituting most of the skeleton of vertebrates and composed chiefly of calcium salts. CMO:0001560 JSmith VT:0005007 clinical_measurement_ontology