A mathematical model consisting of a series of lumped segments connected by linear springs and dashpots is developed to predict the dynamic response of the lumbar spine to conditions similar to those existing in a head-on automobile collision where a lap-type seat belt is worn. Experimental measurements are made on the spines of Rhesus monkeys ( Macaca mulatta ) to determine viscoelastic properties in both tension and bending, and these properties are incorporated into the model. An experiment is performed which subjects the spine to conditions close to those expected in the actual collision situation. Spinal response is measured and compared to predictions made by subjecting the model to the same conditions. Agreement is good for the range of conditions studied, but the measured nonlinear spinal characteristics may have to be incorporated into the model if a wider range of conditions is to be successfully treated.
