Ideal T1 laminar screw fixation based on computed tomography morphometry

Table 3 Comparison of the T1 laminar morphology with the literature data^a

Measurements	Groups	Present study	Modified sagittal reconstruction	Patel, USA^[b]	Molina, USA^[c]	Hu, China^[d]	Kretzer, USA^[e]
Patient’s age		20-70 years old	20-70 years old	8-18 years old	2-16 years old	19-78 years old	>18 years old
L	Total	32.8 ± 3.2		29.9 ± 4.1		30.8 ± 3.4	33.4 ± 3.6
	Males	34.8 ± 2.7		30.6 ± 4.2	31.9	32.0 ± 3.2	34.7 ± 3.6
	Females	30.7 ± 2.1		29.1 ± 4.0	28.9	29.6 ± 3.1	32.0 ± 3.0
W	Total	7.4 ± 1.3		6.5 ± 1.3		6.2 ± 1.0	6.6 ± 1.1
	Males	8.1 ± 1.2		6.6 ± 1.4	5.7	6.5 ± 0.8	6.9 ± 1.1
	Females	6.7 ± 1.1		6.4 ± 1.2	4.8	5.9 ± 1.0	6.3 ± 1.0
Ws	Total	4.4 ± 0.9				3.4 ± 1.0	3.7 ± 1.0
	Males	4.8 ± 0.9			2.4	3.6 ± 1.1	4.0 ± 1.0
	Females	3.8 ± 0.6			2.0	3.2 ± 0.9	3.3 ± 0.9
A	Total	48.6 ± 3.5		47 ± 4		99.9 ± 3.6	49.2 ± 3.7
	Males	47.2 ± 3.2		47 ± 4	50.0	99.6 ± 4.2	49.1 ± 4.0
	Females	50.1 ± 3.2		46 ± 4	50.0	100.2 ± 3.1	49.3 ± 3.4
T	Total	10.8 ± 2.1	10.1 ± 2.3	12.3 ± 3.4		16.9 ± 1.3
	Males	11.9 ± 2.0	11.3 ± 2.2	11.8 ± 3.4		17.6 ± 1.3
	Females	9.6 ± 1.5	8.8 ± 1.5	12.8 ± 3.3		16.4 ± 1.0
Ts	Total	6.1 ± 1.6	5.7 ± 1.7
	Males	6.6 ± 1.7	6.3 ± 1.8		11.4
	Females	5.5 ± 1.3	5.2 ± 1.3		10.3
H	Total	13.5 ± 1.4	13.6 ± 1.6
	Males	14.0 ± 1.3	14.1 ± 1.5
	Females	12.8 ± 1.2	13.0 ± 1.4

^aThe translaminar screw length (L), the minimal outer cortical width (W), the minimal cancellous width (W_s), the minimal outer cortical height (T), the minimal cancellous height (T_s), the axis angle (A) and the spinous process height (H) in T1 are reported as \( \overset{-}{\mathrm{X}} \) ±S.
[^b] Patel AJ, Cherian J, Fulkerson DH, Fox BD, Chern JJ, Whitehead WE, Curry DJ, Luerssen TG, Jea A (2011) Computed tomography morphometric analysis for translaminar screw fixation in the upper thoracic spine of the pediatric population. Journal of neurosurgery Pediatrics 7 (4):383-388.
[^c] Molina C, Sciubba DM, Chaput C, Tortolani PJ, Jallo GI, Kretzer RM (2012) A computed tomography-based feasibility study of translaminar screw placement in the pediatric thoracic spine. Journal of neurosurgery Pediatrics 9 (1):27-34.
[^d] Hu QF, Xu RM, Pan H, Zhou H, Lei W (2015) Translaminar Screw Fixation in the Upper Thoracic Spine: Computed Tomography-Based Quantitative Laminar Analysis and Feasibility Study of Translaminar Virtual Screw Placement. Cell biochemistry and biophysics 2015, 73(1): 191-198.
[^e] Kretzer RM, Chaput C, Sciubba DM, Garonzik IM, Jallo GI, McAfee PC, Cunningham BW, Tortolani PJ (2010) A computed tomography-based feasibility study of translaminar screw fixation in the upper thoracic spine. Journal of neurosurgery Spine 12 (3):286-292.

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