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 pointsSample 1Sample 2Sample 3Sample 4Sample 5Sample 6Mean ± 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.