Predicting the Failure Risk of Internal Fixation Devices in Chinese Patients Undergoing Spinal Internal Fixation Surgery: Development and Assessment of a New Predictive Nomogram
Table 2
Differences in characteristics between normal and failure groups of spinal instrumentation devices in the validation test.
Demographic characteristics
Normal group
Failure group
Overall
()
()
()
Gender
Female
147 (48.0%)
15 (44.1%)
162 (47.6%)
Male
159 (52.0%)
19 (55.9%)
178 (52.4%)
Age
< =45
85 (27.8%)
23 (67.6%)
108 (31.8%)
>45
221 (72.2%)
11 (32.4%)
232 (68.2%)
BMI
<18.5
26 (8.5%)
6 (17.6%)
32 (9.4%)
18.5-24.9
194 (63.4%)
20 (58.8%)
214 (62.9%)
25-29.9
74 (24.2%)
8 (23.5%)
82 (24.1%)
> =30
12 (3.9%)
0 (0%)
12 (3.5%)
Diagnosis
Scoliosis
15 (4.9%)
9 (26.5%)
24 (7.1%)
Spinal fracture
30 (9.8%)
3 (8.8%)
33 (9.7%)
Spinal tumors
40 (13.1%)
2 (5.9%)
42 (12.4%)
Spinal tuberculosis
16 (5.2%)
6 (17.6%)
22 (6.5%)
Spinal degeneration
205 (67.0%)
14 (41.2%)
219 (64.4%)
Scoliosis
No
293 (95.8%)
25 (73.5%)
318 (93.5%)
Yes
13 (4.2%)
9 (26.5%)
22 (6.5%)
Number of screws/number of vertebral bodies spanned
