Table 4.

Stresses along the screw channels in bone

Fixation	Screw channel (from proximal)	Surface of the channel	maxσx (compression stress)	minσx (tensile stress)
First generation Puddu plate	1	Upper	2.16
		Lower		2.07
	2	Upper		2.57
		Lower		4.6
Second generation Puddu plate	1	Upper	1.50
		Lower		6.04
	2	Upper		1.47
		Lower		5.23
TomoFix with bone graft	1	Upper		0.34
		Lower		0.41
	2	Upper	0.78
		Lower		2.58
	3	Upper		0.28
		Lower		1.20
	4	Upper		0.55
		Lower		1.08
	5	Upper		0.34
		Lower		0.87
	6	Upper		0.25
		Lower		0.48
TomoFix without bone graft	1	Upper		0.53
		Lower		0.58
	2	Upper	0.78
		Lower		7.15
	3	Upper		2.20
		Lower		4.70
	4	Upper		1.24
		Lower		2.10
	5	Upper		0.46
		Lower		0.98
	6	Upper		0.35
		Lower		0.76

Note: the values exceeding the maximum allowable threshold for the stresses on the screw are in bold.