Anatomical values of the ADH were used for predictions of the parameters MDH (a) and PDH (b) at all levels of the thoracic spine. The predicted values were superimposed on experimental data that were measured in the present study. Dotted and continuous curves indicate SD of the experimental and predicted values, respectively. Mean percent errors of the predictions larger than 10% are indicated. ADH, anterior disc height; an, anterior; ca, caudal; cr, cranial; MDH, middle disc height; PDH, posterior disc height; po, posterior.