Biomechanical Comparison of Three Different Intramedullary Nails for Fixation of Unstable Basicervical Intertrochanteric Fractures of the Proximal Femur: Experimental Studies

Table 2

Results of the biomechanical test series for three different IM nails (Mean ± SD).

Variables	Group 1	Group 2	Group 3	P-value
	(n = 12)	(n = 12)	(n = 12)
Stiffness (N/mm)	241 ± 53	251 ± 31	238 ± 43	0.26
Failure load (N)	1720 ± 354	1892 ± 299	2332 ± 363	<0.00
Cranial migration (mm)	0.5 ± 0.3	0.6 ± 0.5	1.5 ± 0.8	<0.00
Axial migration (mm)	0.2 ± 0.1	0.4 ± 0.4	1.1 ± 0.8	0.00
Rotation (degrees)	4.6 ± 3.0	2.3 ± 1.6	2.2 ± 1.1	0.01
Varus collapse (degrees)	1.3 ± 0.9	0.7 ± 0.5	1.7 ± 0.8	0.04
Retroversion collapse (degrees)	2.1 ± 1.6	1.4 ± 1.0	1.9 ± 1.2	0.64

-way analysis of variance.
-Wallis test.