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

Table 5

The stress resistance of Ti-24Nb-4Zr-8Sn and Ti-6A1-4V fixation groups under forward flexion loading after fixation (MPa).

Measuring points	Sample 1	Sample 2	Sample 3	Sample 4	Sample 5	Sample 6	Mean ± S.D
1
EG	2.86	2.92	2.82	2.92	2.98	3.09	2.93 ± 0.09
RG	3.61	3.44	3.59	3.71	3.76	3.63	3.62 ± 0.11
2
EG	2.98	3.07	2.94	2.78	3.11	2.96	2.97 ± 0.12
RG	3.71	3.76	3.86	3.57	3.71	3.49	3.68 ± 0.13
3
EG	2.57	2.52	2.48	2.55	2.42	2.5	2.51 ± 0.05
RG	2.02	1.86	1.9	1.96	2.04	1.88	1.94 ± 0.08
4
EG	2.63	2.42	2.38	2.59	2.48	2.59	2.52 ± 0.10
RG	2.05	1.98	2	1.9	1.98	1.94	1.98 ± 0.05
5
EG	3	2.82	2.86	2.94	3.07	3	2.95 ± 0.09
RG	3.9	3.69	3.51	3.44	3.78	3.55	3.65 ± 0.18
6
EG	2.92	2.96	2.84	3.01	2.98	3.13	2.97 ± 0.10
RG	3.63	3.8	3.74	3.53	3.92	3.78	3.73 ± 0.14
7
EG	2.53	2.4	2.48	2.61	2.44	2.55	2.50 ± 0.08
RG	1.84	1.98	2.02	1.96	1.88	1.84	1.92 ± 0.08
8
EG	2.57	2.48	2.38	2.52	2.59	2.63	2.53 ± 0.09
RG	1.9	1.86	2.07	2.05	2.04	1.98	1.98 ± 0.09
9
EG	2.48	2.59	2.44	2.53	2.52	2.59	2.53 ± 0.06
RG	3.05	3.17	3.09	3.01	3.13	3.11	3.09 ± 0.05
10
EG	2.53	2.5	2.46	2.59	2.57	2.48	2.52 ± 0.05
RG	3.15	3.01	3.13	3.07	3.05	3.19	3.01 ± 0.06
11
EG	8.97	8.79	9.56	9.03	8.73	9.26	9.06 ± 0.31
RG	13.09	13.42	13.75	12.87	13.97	14.63	13.62 ± 0.64
12
EG	9.44	9.26	9.15	9.38	8.97	8.79	9.17 ± 0.25
RG	13.86	13.42	14.52	13.64	14.41	12.98	13.80 ± 0.59
13
EG	8.73	9.09	8.97	9.26	9.5	9.2	9.13 ± 0.26
RG	13.75	13.64	13.97	13.53	12.98	13.64	13.58 ± 0.33
14
EG	9.09	9.38	8.79	9.03	9.09	8.67	9.01 ± 0.25
RG	14.19	12.76	13.09	14.19	13.75	12.98	13.49 ± 0.63

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