Accuracy and Precision of Three-Dimensional Low Dose CT Compared to Standard RSA in Acetabular Cups: An Experimental Study

Table 1

Precision of 3D CT compared to standard RSA.

	Standard RSA				3D CT
	2.45 SD	Mean	Min	Max	2.45 SD	Mean	Min	Max
Uncemented cup
Translation (mm)
	0.07	0.00	−0.03	0.05	0.01	0.00	0.00	0.01
	0.05	0.02	−0.02	0.04	0.04	−0.01	−0.04	0.00
	0.09	0.03	−0.02	0.09	0.09	−0.01	−0.09	0.01
Rotation (°)
	0.22	−0.05	−0.15	0.12	0.10	−0.01	−0.10	0.01
	0.13	0.00	−0.10	0.05	0.06	−0.02	−0.05	0.00
	0.08	0.00	−0.03	0.05	0.21	−0.07	−0.21	0.01
Cemented cup
Translation (mm)
	0.08	0.00	−0.04	0.05	0.04	−0.01	−0.03	0.00
	0.04	0.00	−0.02	0.02	0.04	−0.01	−0.04	0.00
	0.09	0.00	−0.05	0.05	0.06	−0.02	−0.06	0.00
Rotation (°)
	0.19	−0.03	−0.16	0.06	0.14	−0.02	−0.11	0.02
	0.32	0.02	−0.17	0.14	0.29	−0.14	−0.24	0.02
	0.12	0.02	−0.03	0.10	0.27	−0.05	−0.27	0.02