calculated tibia bone volume tibia cortical bone volume to tibia total bone volume ratio 2013-07-29T13:29:06Z A calculated measurement in which the portion of the volume of the tibia corresponding to cortical bone is divided by the entire volume of the tibia and presented as a ratio, fraction, quotient or percentage. Volume is the measurement of the size of the three dimensional space occupied by an object. The tibia is the medial and larger of the two bones of the lower leg of bipeds or hindlimb of quadrupeds which articulates with the femur, fibula, and talus. Cortical or compact bone is the relatively solid type of bone tissue found in the middle of long bones which is a hierarchical composite material consisting of a collagen-hydroxyapatite composite at the lowest level forming a complex network of cylindrical units of laminated bone at the highest level. CMO:0001727 JSmith clinical_measurement_ontology tibial cortical bone volume to tibial total bone volume ratio