Fig. 2

Compressive strength (CS) of lumbar spine versus age. Data were taken from the works of Eie [30], Hansson et al. [25], Hansson and Roos [27], Hutton and Adams [26], Adams and Hutton [28], Brinckmann et al. [24, 31] and Ebbesen et al. [29]. Data obtained from Ebbesen et al. were read from the scatter plots. The age range was restricted to 20–79, considering the amount of data and the number of references. (N = 320)