Table 2.

Comparison of pixel value ratios between the two techniques

Cortex	Pixel value ratio		p value
	Lengthening over nail (n = 62 tibiae)	Lengthening and then nailing (n = 178 tibiae)
Anterior
4 weeks	0.78 ± 0.06	0.74 ± 0.05	0.605
8 weeks	0.75 ± 0.05	0.77 ± 0.04	0.525
12 weeks	0.72 ± 0.05	0.76 ± 0.03	0.326
Posterior
4 weeks	0.82 ± 0.08	0.76 ± 0.05	0.607
8 weeks	0.78 ± 0.05	0.89 ± 0.04	< 0.001
12 weeks	0.75 ± 0.07	0.89 ± 0.03	< 0.001
Medial
4 weeks	0.75 ± 0.06	0.72 ± 0.05	0.543
8 weeks	0.73 ± 0.05	0.82 ± 0.05	< 0.001
12 weeks	0.71 ± 0.05	0.82 ± 0.03	< 0.001
Lateral
4 weeks	0.85 ± 0.06	0.82 ± 0.06	0.814
8 weeks	0.78 ± 0.06	0.88 ± 0.03	< 0.001
12 weeks	0.78 ± 0.06	0.91 ± 0.03	< 0.001

Pixel value ratio = the ratio of pixel value of the regenerate bone versus the mean pixel value of the proximal and distal adjacent bones of the lengthened area on radiographs (values are mean ± SD).