Regression of Disc-Osteophyte Complexes Following Laminoplasty Versus Laminectomy with Fusion for Cervical Spondylotic Myelopathy

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Fig. 1
Illustration of disc-osteophyte complex size measurement.
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Fig. 2
Preoperative (A) and postoperative (B) sagittal T2 magnetic resonance imaging of a 54 year-old male 6 months following cervical 3-6 laminoplasty.
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Fig. 3
Preoperative (A) and postoperative (B) sagittal T2 magnetic resonance imaging of a 57-year-old female 6 months following cervical 3-7 laminectomy with fusion. The C4-5 disc osteophyte complex has largely resorbed.

Table 1

Demographic, clinical and radiographic variables.

	Laminoplasty (n = 25)	Laminectomy with Fusion (n = 45)	p-value
Age, (mean ± SD)	54.88 ± 9.05	65.36 ± 10.08	0.0001
Gender			0.5870
Male (%)	19 (76%)	30 (66.6%)
Female (%)	6 (24%)	15 (32.6%)
Number of levels, (mean ± SD)	3.24 ± 1.01	3.44 ± 1.16	0.4625
Sagittal alignment (mean in degrees ± SD)	10.92 ± 7.5	4.578 ± 11.2	0.0138
Lordosis (%)	13 (52%)	14 (31.1%)	0.1242
Straight (%)	12 (48%)	16 (35.6%)	0.3228
Kyphosis (%)	0 (0%)	15 (33.3%)	0.0006
Time between pre- and post-operative MRI, (mean in months ± SD)	16.20 ± 19.07	15.62 ± 21.29	0.9105
Time between surgery and post-operative MRI, (mean in months ± SD)	10.08 ± 12.87	10.67 ± 13.4	0.8593

Table 2

Pre- and postoperative disc-osteophyte complex (D-OC) size between groups.

	Laminoplasty	Laminectomy with Fusion	p-value
Preoperative D-OC size (mean in millimeters ± SD)	3.8410 ± 0.7355	4.6041 ± 1.0583	<0.0001
Postoperative D-OC size (mean in millimeters ± SD)	3.4728 ± 0.8553	2.9766 ± 1.3330	0.0051
Difference between pre- and postoperative D-OC size (mean in millimeters ± SD )	0.3682 ± 0.7404	1.6275 ± 1.4450	<0.0001