Table 1 Average NSA and femoral torsion results per 3D reconstruction and each 2D NSA measurement method (mean ± S.D., degrees).

From: Neck-shaft angle measurement in children: accuracy of the conventional radiography-based (2D) methods compared to 3D reconstructions

Age (year)

n = 24 limbs/year

3D measurement

Biggest diameter—1/3 femur

Circle fitting—1/3 femur

Circle fitting—1/2 femur

Circle fitting—full femur

Femoral torsion

4

132.48 ± 3.60

139.80 ± 4.11

138.49 ± 3.88

140.25 ± 5.35

140.10 ± 5.38

24.23 ± 9.76

5

131.28 ± 5.11

138.83 ± 7.49

137.49 ± 6.87

138.88 ± 7.78

138.65 ± 7.59

24.57 ± 12.34

6

130.28 ± 4.60

138.08 ± 7.62

138.81 ± 7.49

138.63 ± 6.78

138.92 ± 6.47

24.85 ± 13.49

7

130.20 ± 7.28

135.23 ± 7.41

136.00 ± 7.34

136.44 ± 7.95

138.82 ± 8.51

24.56 ± 9.25

8

130.53 ± 6.28

135.42 ± 6.88

135.75 ± 7.27

134.72 ± 7.25

135.38 ± 6.94

22.02 ± 9.59

9

130.48 ± 5.88

135.01 ± 6.03

134.16 ± 6.97

133.31 ± 6.48

133.53 ± 6.59

22.71 ± 6.67

10

130.89 ± 5.26

135.53 ± 5.65

136.06 ± 6.18

135.05 ± 5.12

135.27 ± 6.43

21.73 ± 10.08

11

129.25 ± 4.76

134.13 ± 7.02

133.85 ± 6.85

133.19 ± 5.36

133.25 ± 5.29

20.51 ± 12.75

12

129.34 ± 4.13

133.30 ± 5.03

133.19 ± 5.78

132.20 ± 5.04

132.82 ± 4.54

21.28 ± 10.23

13

128.97 ± 4.27

133.83 ± 3.37

133.29 ± 3.40

132.65 ± 3.63

133.49 ± 3.85

21.63 ± 6.19

14

128.97 ± 4.62

131.28 ± 7.34

130.53 ± 7.62

129.73 ± 7.79

130.15 ± 7.77

18.18 ± 11.48

15

128.11 ± 4.44

133.39 ± 6.27

131.87 ± 5.93

131.03 ± 5.21

131.71 ± 5.17

19.80 ± 10.20

16

127.61 ± 3.73

130.42 ± 6.22

129.19 ± 5.45

129.00 ± 5.95

129.84 ± 5.95

16.60 ± 11.72

SUM

(n = 312 limbs)

129.88 ± 5.09

134.95 ± 6.74

134.51 ± 6.86

134.24 ± 7.02

134.51 ± 6.96

21.78 ± 10.56

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