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Table 3 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 tibia in postmenopausal women

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

Tibia (n = 32) First scan ± SD Second scan ± SD Mean ± SD CV%RMS
Single Tissue Model (STM)
 Stiffness (kN/mm) 172.7 ± 33.7 173.1 ± 34.1 172.9 ± 33.7 3.7
 Apparent Modulus (MPa) 1896.8 ± 375.2 1908.3 ± 374.3 1902.5 ± 372.0 4.0
 Average von Mises Stress (MPa) 66.6 ± 5.8 66.8 ± 5.4 66.7 ± 5.1 4.8
 Failure Load (kN) 8.746 ± 1.570 8.761 ± 1.587 8.754 ± 1.571 2.7
Dual Tissue Model (DTM)
 Stiffness (kN/mm) 316.1 ± 60.9 317.2 ± 61.8 316.6 ± 61.0 3.4
 Apparent Modulus (MPa) 3477.5 ± 685.3 3500.6 ± 685.3 3489.1 ± 680.7 3.8
 Average von Mises Stress (MPa) 120.6 ± 10.2 120.9 ± 9.4 120.7 ± 9.3 3.8
 Failure Load (kN) 7.256 ± 1.345 7.267 ± 1.360 7.261 ± 1.345 2.9
Cortical Bone
 Average von Mises Stress (MPa) 166.4 ± 5.4 166.6 ± 5.6 166.5 ± 5.5 0.8
 % Minimum Load Carried (%) 41.5 ± 9.1 41.9 ± 9.7 41.7 ± 9.4 3.5
 % Maximum Load Carried (%) 61.6 ± 9.9 61.8 ± 10.2 61.7 ± 10.0 2.1
Trabecular Bone
 Average von Mises Stress (MPa) 97.9 ± 11.6 97.8 ± 11.4 97.9 ± 10.8 5.9
 % Minimum Load Carried (%) 58.5 ± 9.1 58.2 ± 9.7 58.3 ± 9.4 2.6
 % Maximum Load Carried (%) 38.4 ± 9.9 38.2 ± 10.2 38.3 ± 10.0 3.5
Scaled E-BMD Model
 Stiffness (kN/mm) 118.7 ± 27.8 118.7 ± 27.5 118.8 ± 27.6 2.1
 Apparent Modulus (MPa) 910.6 ± 223.7 912.8 ± 224.9 911.7 ± 224.0 1.8
 Average von Mises Stress (MPa) 16.7 ± 3.3 16.8 ± 3.2 16.7 ± 3.2 2.0
 Failure Load (kN) 3.558 ± 0.802 3.556 ± 0.797 3.557 ± 0.797 2.5