Fig. 2

Images of the representative case. A Pre-operative plain films revealed Dubousset’s lumbosacral angle (LSA) of 66° and slip percentage of 75%. B Magnetic resonance image showing a thickened anterior portion of the L5-S1 annulus and reduced disc signal intensity. C At 9 months postoperatively, plain films of case 1 showed correction of the L5-S1 spondylolisthesis and solid inter-body fusion (black arrow)