Research Article
Ti-24Nb-4Zr-8Sn Alloy Pedicle Screw Improves Internal Vertebral Fixation by Reducing Stress-Shielding Effects in a Porcine Model
Table 6
The stress resistance of Ti-24Nb-4Zr-8Sn and Ti-6A1-4V fixation groups under backward flexion loading after fixation (MPa).
| Measuring points | Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 | Sample 6 | Mean ± SD |
| 1 | | | | | | | | EG | −4.7 | −4.88 | −4.78 | −4.93 | −5.01 | −4.95 | −4.88 ± 0.15 | RG | −5.95 | −5.86 | −6.12 | −5.84 | −6.11 | −5.78 | −5.94 ± 0.13 | 2 | | | | | | | | EG | −4.82 | −4.99 | −4.93 | −4.78 | −4.9 | −4.86 | −4.88 ± 0.07 | RG | −6.16 | −6.09 | −5.88 | −6.14 | −5.93 | −5.86 | −6.01 ± 0.14 | 3 | | | | | | | | EG | −2.09 | −2.44 | −2.5 | −2.32 | −2.48 | −2.36 | −2.37 ± 0.15 | RG | −1.77 | −1.84 | −1.71 | −1.73 | −1.69 | −1.75 | −1.75 ± 0.05 | 4 | | | | | | | | EG | −2.32 | −2.36 | −2.05 | −2.19 | −2.4 | −2.11 | −2.24 ± 0.14 | RG | −1.67 | −1.88 | −1.63 | −1.77 | −1.84 | −1.79 | −1.76 ± 0.10 | 5 | | | | | | | | EG | −4.99 | −4.88 | −4.93 | −4.78 | −5.03 | −4.9 | −4.92 ± 0.09 | RG | −6.03 | −6.16 | −6.09 | −5.86 | −6.16 | −6.11 | −6.07 ± 0.11 | 6 | | | | | | | | EG | −4.93 | −4.76 | −5.05 | −4.72 | −4.8 | −4.97 | −4.87 ± 0.13 | RG | −5.93 | −5.89 | −5.99 | −6.11 | −6.09 | −5.97 | −6.00 ± 0.09 | 7 | | | | | | | | EG | −2.38 | −2.19 | −2.52 | −2.09 | −2.36 | −2.34 | −2.31 ± 0.15 | RG | −1.67 | −1.61 | −1.82 | −1.86 | −1.69 | −1.79 | −1.74 ± 0.10 | 8 | | | | | | | | EG | −2.44 | −2.09 | −2.46 | −2.25 | −2.4 | −2.3 | −2.32 ± 0.14 | RG | −1.8 | −1.71 | −1.73 | −1.79 | −1.86 | −1.63 | −1.75 ± 0.08 | 9 | | | | | | | | EG | −1.67 | −1.59 | −1.75 | −1.57 | −1.69 | −1.73 | −1.67 ± 0.07 | RG | −1.88 | −2.25 | −2 | −2.25 | −1.98 | −2.28 | −2.11 ± 0.17 | 10 | | | | | | | | EG | −1.57 | −1.73 | −1.67 | −1.61 | −1.56 | −1.71 | −1.64 ± 0.07 | RG | −2.02 | −2.11 | −2.09 | −2.32 | −2.02 | −2.19 | −2.13 ± 0.11 | 11 | | | | | | | | EG | −11.74 | −11.56 | −12.57 | −12.33 | −12.39 | −12.21 | −12.13 ± 0.40 | RG | −15.95 | −16.61 | −17.05 | −16.5 | −17.93 | −17.38 | −16.90 ± 0.70 | 12 | | | | | | | | EG | −12.45 | −12.21 | −11.68 | −12.45 | −12.8 | −12.15 | −12.29 ± 0.38 | RG | −17.16 | −16.28 | −17.71 | −17.27 | −16.83 | −16.28 | −16.92 ± 0.57 | 13 | | | | | | | | EG | −11.62 | −13.04 | −12.33 | −12.74 | −12.04 | −12.86 | −12.44 ± 0.54 | RG | −16.83 | −16.17 | −17.82 | −16.17 | −18.15 | −16.94 | −17.01 ± 0.83 | 14 | | | | | | | | EG | −12.04 | −11.98 | −12.74 | −12.98 | −12.33 | −12.8 | −12.48 ± 0.42 | RG | −17.6 | −17.05 | −16.83 | −17.16 | −17.71 | −16.06 | −17.07 ± 0.60 |
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Note. versus an RG group. Stress values are negative due to compressive pressure caused by backward flexion load. |