Table 3.
Biomechanical testing of left femurs. Rats in the O group were ovariectomized. Rats in OE and OESr were subjected to 10 impacts per day, 5 days a week for 8 weeks. Rats in Sr and OESr groups received 625 mg/kg/day of SR. The critical p-value was p ≤ 0.05; NS: non-significant; a: vs. Sh; b: vs. O; c: vs. OE; d: vs. OSr and e: vs. OESr.
| Variables | Sh | O | OE | OSr | OESr |
|---|---|---|---|---|---|
| Ultimate strength (N) |
134.193 ± 11.313 d e |
144.433 ± 11.040 e |
145.163 ± 13.110 e |
153.405 ± 11.234 a |
157.778 ± 13.046 a b c |
| Cross-sectional area (mm2) |
3.944 ± 0.258 vs. all |
4.556 ± 0.176 vs. all |
4.996 ± 0.0440 a b |
4.941 ± 0.368 a b |
5.274 ± 0.528 a b |
| Yield point stress (N) |
269.313 ± 34.599 c e |
256.185 ± 20.202 NS |
232.273 ± 18.045 a d |
264.452 ± 21.385 c |
243.035 ± 34.0,857 a b |
| Moment of inertia (mm4) |
4.207 ± 4.459 c e |
4.818 ± 0.435 c e |
5.555 ± 0.751 a b |
4.872 ± 0.585 ns |
5.776 ± 0.857 a b |
| Stiffness (N/mm) |
221.410 ± 25.469 d e |
223.143 ± 25.247 d e |
227.152 ± 25.271 d e |
241.152 ± 25.082 vs. all |
256.580 ± 25.469 vs. all |