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Table 1 Mean muscle CSA, correlational coefficient values and Bland-Altman limits of agreement for US and MRI

From: Validity of ultrasound imaging for intrinsic foot muscle cross-sectional area measurements demonstrated by strong agreement with MRI

Muscle US MRI Inter-method ICC r* LoA Lower LoA Upper LoA %
Average
Right foot
 FHB 1.41 ± 0.36 1.40 ± 0.36 0.988
(0.976 - 0.994)
0.976 -0.15 0.17 11.3
 ABDH 2.48 ± 0.57 2.53 ± 0.51 0.982
(0.965 - 0.991)
0.971 -0.35 0.21 11.3
 FDB 2.29 ± 0.53 2.36 ± 0.52 0.981
(0.963 - 0.990)
0.989 -0.20 0.10 6.6
 QP 1.92 ± 0.58 1.90 ± 0.59 0.992
(0.984 - 0.996)
0.985 -0.18 0.23 10.6
 ADM 1.28 ± 0.37 1.27 ± 0.37 0.985
(0.971 - 0.993)
0.985 -0.12 0.14 10.1
Left foot
 FHB 1.36 ± 0.34 1.37 ± 0.35 0.993
(0.986 - 0.996)
0.986 -0.14 0.09 8.5
 ABDH 2.46 ± 0.6 2.51 ± 0.63 0.987
(0.974 - 0.993)
0.976 -0.32 0.23 11.2
 FDB 2.27 ± 0.56 2.32 ± 0.54 0.960
(0.922 - 0.980)
0.992 -0.18 0.08 5.7
 QP 1.92 ± 0.58 1.91 ± 0.64 0.990
(0.981 - 0.995)
0.985 -0.23 0.24 12.2
 ADM 1.29 ± 0.34 1.28 ± 0.33 0.983
(0.967 - 0.992)
0.995 -0.14 0.15 11.2
  1. CSA cross-sectional area (cm2; mean ± SD), r Pearson product correlations, FHB flexor hallucis brevis, ABDH abductor hallucis, FDB flexor digitorum brevis, QP quadratus plantae, ADM abductor digiti minimi. *All r-values significant at p < .0001