by means of lateral radiographs in flexion and extnsion , the axes of movement and the degree of mobility at the l3 -- l4 , l4 -- l5 , and l5 -- s1 levels were determined in 24 cases of true ( spondylolytic ) spondylolisthesis .
C0038018
spondylolytic
C0038016
spondylolisthesis