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Table 2 Mean (±SD) of the baseline and follow-up scans, mean (±SD) of both measurements, root-mean-square precision error (CV%RMS) for stiffness, apparent stiffness, average von Mises stress, and failure load from 3 different FE models at the distal radius in postmenopausal women

From: In vivo precision of three HR-pQCT-derived finite element models of the distal radius and tibia in postmenopausal women

Radius (n = 27) First scan ± SD Second scan ± SD Mean ± SD CV%RMS
Single Tissue Model (STM)
 Stiffness (kN/mm) 57.2 ±11.7 56.1 ± 11.7 56.6 ± 11.7 3.4
 Apparent Modulus (MPa) 1296.3 ± 340.2 1257.1 ± 307.7 1276.7 ± 320.6 5.3
 Average von Mises Stress (MPa) 58.0 ± 6.1 57.0 ± 5.9 57.5 ± 5.8 3.8
 Failure Load (kN) 2.944 ± 0.542 2.886 ± 0.543 2.915 ± 0.540 2.8
Dual Tissue Model (DTM)
 Stiffness (kN/mm) 106.8 ± 22.3 105.2 ± 22.3 106.0 ± 22.2 3.3
 Apparent Modulus (MPa) 2428.5 ± 652.3 2355.2 ± 583.90 2391.9 ± 611.6 5.4
 Average von Mises Stress (MPa) 108.1 ± 12.2 106.2 ± 11.5 107.2 ± 11.5 3.8
 Failure Load (kN) 2.535 ± 0.488 2.505 ± 0.489 2.520 ± 0.486 2.9
Cortical Bone
 Average von Mises Stress (MPa) 153.5 ± 7.9 152.2 ± 7.4 152.8 ± 7.5 1.5
 % Minimum Load Carried (%) 48.3 ± 8.4 48.4 ± 7.7 48.3 ± 7.8 6.1
 % Maximum Load Carried (%) 77.6 ± 9.0 77.8 ± 8.9 77.7 ± 8.8 2.2
Trabecular Bone
 Average von Mises Stress (MPa) 76.6 ± 12.1 74.4 ± 11.9 75.5 ± 11.4 6.7
 % Minimum Load Carried (%) 51.8 ± 8.4 51.6 ± 7.7 51.7 ± 7.8 7.1
 % Maximum Load Carried (%) 22.4 ± 9.0 22.2 ± 8.9 22.3 ± 8.8 9.5
Scaled E-BMD Model
 Stiffness (kN/mm) 41.1 ± 12.6 40.6 ± 12.0 40.8 ± 12.2 4.4
 Apparent Modulus (MPa) 595.2 ± 215.1 583.7 ± 184.1 589.4 ± 196.0 8.7
 Average von Mises Stress (MPa) 13.2 ± 4.0 13.0 ± 3.4 13.1 ± 3.6 7.1
 Failure Load (kN) 1.222 ± 0.373 1.194 ± 0.347 1.208 ± 0.357 5.0