Cervical Sagittal Imbalance after Cervical Laminoplasty in Elderly Patients

Table 1

Preoperative range, mean value, and standard deviation of each parameter in elderly patients () vs. young patients ().

	Elderly patients ()			Young patients ()
	Minimum	Maximum	Mean (SD)	Minimum	Maximum	Mean (SD)
Age	65.00	84.00	70.80 (5.03)	36.00	64.00	52.53 (7.68)
C2-7 SVA	-0.60	5.10	2.09 (1.26)	0.70	4.80	1.97 (0.86)
CL	2.70	31.60	13.98 (7.86)	5.00	33.00	12.59 (6.47)
T1 slope	4.90	48.60	26.16 (9.73)	15.00	46.00	25.43 (6.34)
T1 slope-CL	2.10	27.10	13.22 (5.83)	-1.00	29.50	12.84 (5.89)

In the older groups (men, ), the mean age was 70.8 yrs. The preoperative data were as follows: C2-7 SVA mean range, 2.09; CL mean range, 13.98; T1 slope mean range, 26.16; and T1 slope-CL mean range, 13.22. In the younger group (men, ), the mean age was 52.53 yrs. The preoperative data were as follows: C2-7 SVA mean range, 1.97; CL mean range, 12.59; T1 slope mean range, 25.43; and T1 slope-CL mean range, 12.84. C2-7 SVA: C2-7 sagittal vertical axis; CL: cervical lordosis; T1 slope-CL: T1 slope minus cervical lordosis.