A New Automated Way to Measure Polyethylene Wear in THA Using a High Resolution CT Scanner: Method and Analysis

Table 1

Phantom displacement and distance difference as determined from the micrometer settings.

Scan series identifier (letters identify scan 1 to 14 in each series)		Displacement; (mm)			Expected CupHeadSeparation (mm) distance between acetabular cup and femoral component head centers relative to the reference scans (T, A) with a starting position of 0.00 mm
One	Two	𝑋	𝑌	𝑍
T	A	0.000	0.000	0.000	0.000
K	G	0.000	0.000	0.000	0.000
X	T	0.050	0.050	0.050	0.087
W	F	0.100	0.100	0.100	0.173
N	R	0.150	0.100	0.100	0.206
P	M	0.150	0.150	0.100	0.235
A	Y	0.150	0.150	0.150	0.260
R	D	0.200	0.200	0.200	0.346
H	W	0.250	0.250	0.250	0.433
Z	C	0.300	0.300	0.300	0.520
D	K	0.350	0.350	0.350	0.606
M	P	0.400	0.400	0.400	0.692
E	V	0.450	0.450	0.450	0.779
S	Z	0.500	0.500	0.500	0.866