Fig. 1

Comparison of the effects of the Isobar TTL dynamic stabilization system and the rigid fixation system on lumbar mobility and height of intervertebral space. a The intervertebral space height of L3/4, the surgical segment, in the Isobar TTL and rigid groups before surgery and at the last follow-up. b The intervertebral space height of L2/3, the upper adjacent segment, in the Isobar TTL and rigid groups before surgery and at the last follow-up. c ROMs of the nonfusion fixed segment before surgery and at the last follow-up. d The ROM of the surgical segment L3/4 before surgery and at the last follow-up in the two groups. e The ROM of upper adjacent segment L2/3 before surgery and at the last follow-up in the two groups. * means P < 0.05