Ideal T1 laminar screw fixation based on computed tomography morphometry

Table 1 Measurements in T1 stratified by side of screw placement and patient’s sex^a

Measurements	Total	Male	Female	t	P	Left	Right	t	P
L (mm)	32.8 ± 3.2	34.8 ± 2.8	30.7 ± 2.1	9.405	P < 0.05	32.6 ± 3.3	33.0 ± 3.3	-1.971	P > 0.05
W (mm)	7.4 ± 1.3	8.1 ± 1.2	6.7 ± .1.1	6.811	P < 0.05	7.4 ± 1.3	7.4 ± 1.3	-0.128	P > 0.05
Ws (mm)	4.4 ± 0.9	4.8 ± 0.9	3.8 ± 0.6	7.101	P < 0.05	4.3 ± 0.9	4.4 ± 0.9	-1.772	P > 0.05
A (°)	48.6 ± 3.5	47.2 ± 3.2	50.1 ± 3.2	-5.044	P < 0.05	48.7 ± 3.2	48.5 ± 3.9	0.243	P > 0.05
T (mm)	10.8 ± 2.1	11.9 ± 2.0	9.6 ± 1.5	7.452	P < 0.05	10.7 ± 2.2	10.8 ± 2.0	-0.276	P > 0.05
MT (mm)	10.1 ± 2.3	11.3 ± 2.2	8.8 ± 1.5	7.293	P < 0.05	9.9 ± 2.3	10.2 ± 2.2	-0.572	P > 0.05
Ts (mm)	6.1 ± 1.6	6.6 ± 1.7	5.5 ± 1.3	3.772	P < 0.05	6.0 ± 1.6	6.1 ± 1.7	-0.998	P > 0.05
MTs (mm)	5.8 ± 1.7	6.3 ± 1.8	5.2 ± 1.3	3.961	P < 0.05	5.6 ± 1.6	5.9 ± 1.7	-1.399	P > 0.05
H (mm)	13.5 ± 1.4	14.0 ± 1.3	12.8 ± 1.2	5.184	P < 0.05	13.4 ± 1.4	13.5 ± 1.4	-1.447	P > 0.05
MH (mm)	13.6 ± 1.6	14.1 ± 1.5	13.0 ± 1.4	4.222	P < 0.05	13.6 ± 1.6	13.6 ± 1.6	-1.616	P > 0.05

^aThe laminar screw length (L), the minimal outer cortical width (W), the minimal cancellous width (W_s), the minimal outer cortical height (T, MT), the minimal cancellous height (T_s, MT_s), the axis angle (A) and the spinous process height (H, MH) in T1 are reported as \( \overset{-}{\mathrm{X}} \) ±S. T, T_s, and H were measured in the sagittal reconstruction, while the MT, MT_s, and MH were measured in the modified sagittal reconstruction.

ISSN: 1471-2474