Table II.

Pearson’s correlation analyses show that the BMD does not predict maximum torque at the cortical bone site. IDI was a significant predictor of maximum torque for both the 3.5mm and 4.5mm OD stainless steel screws at the femoral diaphysis. At the femoral metaphysis, BMD significantly correlated with the maximum screw stripping torque for all three screws. In contrast, IDI did not predict maximum screw stripping torque for any of the screws at the metaphysis.

	Correlations with maximum screw stripping torque
	Femoral diaphysis		Femoral metaphysis
	vs BMD	vs IDI	vs BMD	vs IDI
3.5 mm OD screw	NS	p < 0.01 R = −0.56	p < 0.01 R = 0.61	NS
4.5 mm OD screw	NS	p < 0.01 R = −0.57	p < 0.01 R = 0.51	NS
6.5 mm OD screw	--	--	p < 0.01 R = 0.56	NS