Comparison of preoperative (left) and postoperative (right) LLD between study groups, including mean and subgroup differences. *Note to JOA reviewer: please print in color.

Table 2: Comparison of preoperative (left) and postoperative (right) LLD between study groups, including mean and subgroup differences.

Preoperative	No imaging	Imaging	p value	Postoperative	No imaging	Imaging	p value
Mean (mm)	-4.18	-3.43	0.51	Mean (mm)	-0.6	1.4	0.01
< -10 mm	8	4	0.20	< -10 mm	2	0	0.15
< -5 mm	20	25	0.42	< -5 mm	8	3	0.10
> 5 mm	2	2	0.97	> 5 mm	7	10	0.48
> 10 mm	0	0	0.00	> 10 mm	0	2	0.16
Within 5 mm of epual	36	33	0.44	Within 5 mm of epual	43	47	0.59