Biomechanical comparison of the femoral neck system versus InterTan nail and three cannulated screws for unstable Pauwels type III femoral neck fracture

Table 1 Biomechanical test results of three fixation methods

Group	Axial stiffness (N/mm)	A-P bending stiffness (N/mm)	Torsional stiffness (Nm/°)	Overall deformation (mm)	Local deformation of implant holes (mm)
Group A	423.71 ± 18.69	227.46 ± 26.07	0.32 ± 0.01	2.45 ± 0.25	1.2 ± 0.1
Group B	485.63 ± 13.27^a	410.08 ± 50.37^a	0.31 ± 0.03	2.02 ± 0.10^a	0.81 ± 0.08^a
Group C	375.75 ± 14.32^a,b	145.2 ± 14.83^a,b	0.22 ± 0.02^a,b	3.39 ± 0.23^a,b	2.18 ± 0.07^a,b
F	74.781	96.280	45.222	70.550	435.023
P	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001

^aP < 0.01, vs. Group A; ^bP < 0.01, vs. Group B
Values are presented as mean ± standard deviation
F and P values are obtained by one-way analysis of variance
Different letters (a, b) indicate significant differences in the same column at a P < 0.01 by Bonferroni post hoc test

ISSN: 1475-925X