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
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 |