Research Article
Ti-24Nb-4Zr-8Sn Alloy Pedicle Screw Improves Internal Vertebral Fixation by Reducing Stress-Shielding Effects in a Porcine Model
Table 4
The strain resistance of Ti-24Nb-4Zr-8Sn and Ti-6A1-4V fixation groups under backward flexion loading after fixation (με, ×10−6).
| Measuring points | Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 | Sample 6 | Mean ± SD |
| 1 | | | | | | | | EG | −245 | −254 | −249 | −257 | −261 | −258 | −254 ± 6 | RG | −310 | −305 | −319 | −304 | −318 | −301 | −310 ± 8 | 2 | | | | | | | | EG | −251 | −260 | −257 | −249 | −255 | −253 | −254 ± 4 | RG | −321 | −317 | −306 | −320 | −309 | −305 | −313 ± 7 | 3 | | | | | | | | EG | −109 | −127 | −130 | −121 | −129 | −123 | −123 ± 8 | RG | −92 | −96 | −89 | −90 | −88 | −91 | −91 ± 3 | 4 | | | | | | | | EG | −121 | −123 | −107 | −114 | −125 | −110 | −117 ± 7 | RG | −87 | −98 | −85 | −92 | −96 | −93 | −92 ± 5 | 5 | | | | | | | | EG | −260 | −254 | −257 | −249 | −262 | −255 | −256 ±5 | RG | −314 | −321 | −317 | −305 | −321 | −318 | −316 ± 6 | 6 | | | | | | | | EG | −257 | −248 | −263 | −246 | −250 | −259 | −254 ± 7 | RG | −309 | −307 | −312 | −318 | −317 | −311 | −312 ± 4 | 7 | | | | | | | | EG | −124 | −114 | −131 | −109 | −123 | −122 | −121 ± 8 | RG | −87 | −84 | −95 | −97 | −88 | −93 | −91 ± 5 | 8 | | | | | | | | EG | −127 | −109 | −128 | −117 | −125 | −120 | −121 ± 7 | RG | −94 | −89 | −90 | −93 | −97 | −85 | −91 ± 4 | 9 | | | | | | | | EG | −87 | −83 | −91 | −82 | −88 | −90 | −87 ± 4 | RG | −98 | −117 | −104 | −117 | −103 | −119 | −110 ± 9 | 10 | | | | | | | | EG | −82 | −90 | −87 | −84 | −81 | −89 | −86 ± 4 | RG | −105 | −110 | −109 | −121 | −105 | −114 | −111 ± 6 | 11 | | | | | | | | EG | −145 | −151 | −155 | −150 | −163 | −158 | −154 ± 6 | RG | −199 | −196 | −213 | −209 | −210 | −207 | −206 ± 7 | 12 | | | | | | | | EG | −156 | −148 | −161 | −157 | −153 | −148 | −154 ± 5 | RG | −211 | −207 | −198 | −211 | −217 | −206 | −208 ± 6 | 13 | | | | | | | | EG | −153 | −147 | −162 | −147 | −165 | −154 | −155 ± 8 | RG | −197 | −221 | −209 | −216 | −204 | −218 | −211 ± 9 | 14 | | | | | | | | EG | −160 | −155 | −153 | −156 | −161 | −146 | −155 ± 5 | RG | −204 | −203 | −216 | −220 | −209 | −217 | −212 ± 7 |
|
|
Note. versus an RG group. Strain values are negative due to compressive pressure caused by backward flexion load. |