Journal of Experimental Orthopaedics

Table 1 Repeatability of cup migration as signed and absolute values from RSA double-examinations (n = 38 double examinations)

From: Superior bone fixation of conical compared with hemispherical trapezial cup design: an experimental radiostereometry study

	Signed translations			Absolute translations
	x	y	z	x	y	z	TT
Mean difference^a	0.001	-0.001	-0.001	0.021	0.023	0.039	0.031
Precision^b	0.053	0.062	0.105	0.032	0.042	0.072	0.066
Min. difference	-0.055	-0.100	-0.150	0.000	0.000	0.001	0.000
Max. difference	0.060	0.085	0.145	0.060	0.100	0.150	0.146

Numbers are reported as translation in mm
^amean difference between double examinations (systematic error)
^bprecision was calculated as 1.96 × SD (random error)
TT Total translation

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