Table 3.
Stepwise multiple regression models between the fracture loads and the geometrical and trabecular properties and the corresponding R2 and p values.
| Stepwise Multiple Regression Models | R2 | p |
|---|---|---|
| Pooled whole bone fracture load vs. Geometric properties | ||
| FW = 5144.8 CTh – 488.6 | 0.49 | < 0.001 |
| Fracture group whole bone fracture load vs. Geometric properties : | ||
| none | - | - |
| Nonfracture group whole bone fracture load vs. Geometric properties: | ||
| FW = 5339.1 CTh – 684.3 | 0.52 | 0.019 |
| Pooled cortical bone fracture load vs. Geometric properties: | ||
| FC = 4807.0 CTh – 2.34 DJC – 1017.1 | 0.86 | < 0.001 |
| Fracture group cortical bone fracture load vs. Geometric properties: | ||
| FC = 6815.5 CTh – 71.6 CAC + 306.5 | 0.96 | < 0.001 |
| Nonfracture group cortical bone fracture load vs. Geometric properties: | ||
| FC = 5255.6 CTh – 2450.4 | 0.83 | < 0.001 |
| Pooled cortical/whole bone fracture load ratio vs. Geometric properties: | ||
| FC/FW = 1.30 (CAC/CAW) – 0.270 | 0.47 | < 0.001 |
| Fracture group cortical/whole bone fracture load ratio vs. Geometric properties: | ||
| FC/FW = 1.56 (CAC/CAW) – 0.476 | 0.67 | 0.004 |
| Nonfracture group cortical/whole bone fracture load vs. Geometric properties: | ||
| FC/FW = 1.41 (CIxxC/ CIxxW) – 0.474 | 0.45 | 0.034 |
| Pooled whole bone fracture load vs. Trabecular properties: | ||
| none | - | - |
| Fracture group whole bone fracture load vs.Trabecular properties: | ||
| FW = 78861.9 Tb.Th – 521.7 | 0.40 | < 0.05 |
| Nonfracture group whole bone fracture load vs. Trabecular properties: | ||
| none | - | - |
Whole (FW) and cortical (FC) bone fracture load; cortical thickness at the crack surface (CTh); cortical bone polar moment of inertia at the distal surface (DJC); cortical bone area at the crack surface (CAC); whole bone area at the crack surface (CAW); cortical bone moment of inertia in medial-lateral direction at the crack surface (CIxxC); whole bone moment of inertia in medial-lateral direction at the crack surface (CIxxW); trabecular thickness (Tb.Th). Note that the units of FW and FC are in N, CTh and Tb.Th are in mm, CAC and CAW are in mm2, DJC, CIxxC, and CIxxW are in mm4.