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TABLE 1. Evaluation of X-ray bead tracking accuracy using the four foot cast beads. Inter-bead distances measured 10 times by electronic calipers (mean ± standard deviation) are compared to mean inter-bead distances from each of our 14 repeatable trials. P-values were calculated using a two-tailed Students t-test assuming unequal variance. The difference was less than 0.3 mm in all cases.

Inter-bead Distance

Calipers (mm)

X-ray (mm)

Difference

p-value

tarsometatarsus-II

34.9 ± 0.35

35.2 ± 0.07

0.303

0.026

tarsometatarsus-III

90.5 ± 0.40

90.7 ± 0.06

0.191

0.184

tarsometatarsus-IV

71.6 ± 0.29

71.8 ±0.05

0.200

0.077

II-III

71.8 ± 0.15

71.6 ± 0.05

0.179

0.008

II-IV

71.5 ± 0.27

71.4 ± 0.06

0.088

0.373

III-IV

53.8 ± 0.27

54.0 ± 0.05

0.189

0.053

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