Table 2
Ratio of pars interarticularis distance to spinal canal width for each vertebral lumbar level.
Lumbar Level
Pars Interarticularis Distance/Spinal Canal Width Ratio, Mean ± SD
L1
1.17 ± 0.11
L2
1.23 ± 0.09
L3
1.34 ± 0.09
L4
1.49 ± 0.13
L5
1.67 ± 0.18