Ti-24Nb-4Zr-8Sn Alloy Pedicle Screw Improves Internal Vertebral Fixation by Reducing Stress-Shielding Effects in a Porcine Model

Table 3

The strain resistance of -24Nb-4Zr-8Sn and Ti-6A1-4V fixation groups under forward 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	149	152	147	152	155	161	152.67 ± 4.93
RG	188	179	187	193	196	189	188.66 ± 5.82
2
EG	155	160	153	145	162	154	154.83 ± 5.98
RG	193	196	201	186	193	182	191.83 ± 6.85
3
EG	134	131	129	133	126	130	130.50 ± 2.88
RG	105	97	99	102	106	98	101.17 ± 3.76
4
EG	137	126	124	135	129	135	131.00 ± 5.40
RG	107	103	104	99	103	101	102.83 ± 2.71
5
EG	156	147	149	153	160	156	153.50 ± 4.85
RG	203	192	183	179	197	185	189.83 ± 9.13
6
EG	152	154	148	157	155	163	154.83 ± 5.04
RG	189	198	195	184	204	197	194.50 ± 7.06
7
EG	132	125	129	136	127	133	130.33 ± 4.08
RG	96	103	105	102	98	96	100.00 ± 3.85
8
EG	134	129	124	131	135	137	131.67 ± 4.72
RG	99	97	108	107	106	103	103.33 ± 4.50
9
EG	129	135	127	132	131	135	131.50 ± 3.21
RG	159	165	161	157	163	162	161.17 ± 2.86
10
EG	132	130	128	135	134	129	131.33 ± 2.80
RG	164	157	163	160	159	166	161.50 ± 3.39
11
EG	119	122	125	117	127	133	123.83 ± 5.81
RG	152	149	162	153	148	157	153.50 ± 5.24
12
EG	126	122	132	124	131	118	125.50 ± 5.36
RG	160	157	155	159	152	149	155.33 ± 4.23
13
EG	125	124	127	123	118	124	123.50 ± 302
RG	148	154	152	157	161	156	154.67 ± 4.48
14
EG	129	116	119	129	125	118	122.67 ± 5.75
RG	154	159	149	153	154	147	152.67 ± 4.23

Note.  versus an RG group. Strain values are positive (tensile) due to elongation caused by forward flexion load.