Table 4 Factorial cluster analysis of 3D voxel based quantified BTU values showing three distinct regions (proximal thigh, distal thigh, acetabular cup)

Distal thigh

Z12

0.93

0.18

0.20

Z3 ratio

0.96

0.10

0.01

Z3

0.93

0.15

0.22

Z5 ratio

0.93

0.14

0.13

Z5

0.90

0.22

0.23

Z12 ratio

0.93

0.10

0.06

Z10

0.87

0.22

0.27

Z10 ratio

0.91

0.11

0.17

Z11

0.85

0.30

0.09

Z4 ratio

0.71

0.26

-0.06

Z4

0.83

0.22

-0.04

Z11 ratio

0.71

0.29

-0.02

Z6

0.73

0.38

0.42

Z6 ratio

0.61

0.56

0.20

Z13

0.81

0.23

0.41

Z13 ratio

0.60

0.55

0.36

Z9

0.79

0.32

0.38

Z9 ratio

0.56

0.46

0.14

Z2

0.77

0.28

0.34

Z2 ratio

0.55

0.62

0.13

Proximal thigh

Z8

0.21

0.94

0.11

Z8 ratio

-0.06

0.90

0.08

Z7

0.31

0.84

0.33

Z1 ratio

0.24

0.82

0.12

Z14

0.27

0.78

0.39

Z7 ratio

0.21

0.71

0.11

Z1

0.42

0.76

0.33

Z14 ratio

0.22

0.44

0.22

Acetabular cup

PI

0.06

0.19

0.91

PI ratio

0.02

-0.01

0.91

PS

0.23

0.20

0.89

AI ratio

0.13

0.16

0.87

AI

0.36

0.31

0.84

AS ratio

0.12

0.21

0.86

AS

0.39

0.35

0.71

PS ratio

0.00

0.22

0.79