Three Dimensional Adaptive Bone Remodeling Simulation of THR Femur and Anterior Fixed Vertebra.

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The adaptive bone remodeling phenomenon was analyzed using the three dimensional finite element method on two important clinical problem ; a proximal femur after prosthetic total hip joint replacement (THR) and vertebral bodies fixed by the anterior spinal instrumentation (SI). On the THR simulation, a normal hip joint model which composed of the proximal femur and the pelvic bone including femoral head and acetabular was constructed three-dimensionally. On the simulation of spinal instrumentation, a normal lumbar spine model which composed three vertebral bodies and four intervertebral discs was constructed three-dimensionally. Each normal model was used to determine the bone density distribution in normal bone tissue using the adaptive bone remodeling theory proposed by Weinans et al. It was confirmed that the bone density distribution obtained from the simulation was almost similar to the physiological distribution. Subsequently, THR model was constructed by the insertion of a noncemented prosthesis of Harris Type into the normal hip joint model, and SI model was constructed by the insertion of Kaneda device into the normal lumbar spine model. As a result, the remodeling simulation showed that the bone density and the stress decreased significantly at cancellous bone around bone-inplant interface.