Table 3.
Outliers greater than 3° in coronal, sagittal, and axial alignment instrumentation
| Variable | Greater than 3° deviation of variable from plan (N)* | Odds ratio | 95% CI | p value | Greater than 3° deviation of variable from plan (N)* | Odds ratio | 95% CI | p value | ||
|---|---|---|---|---|---|---|---|---|---|---|
| CT-based patient-specific instrumentation group | Conventional instrumentation group | MRI-based patient-specific instrumentation group | Conventional instrumentation group | |||||||
| Coronal mechanical limb axis | 9 (30%) | 13 (43%) | 0.56 | 0.19–1.62 | 0.41 | 2 (7%) | 13 (43%) | 0.09 | 0.02–0.46 | 0.002 |
| Coronal alignment femur | 4 (13%) | 7 (23%) | 0.5 | 0.13–1.95 | 0.5 | 1 (3%) | 7 (23%) | 0.11 | 0.01–0.99 | 0.05 |
| Coronal alignment tibia | 5 (17%) | 6 (20%) | 0.9 | 0.24–3.3 | 1 | 1 (3%) | 6 (20%) | 0.15 | 0.02–1.37 | 0.1 |
| Rotational alignment femur | 4 (13%) | 15 (50%) | 0.14 | 0.03–0.68 | 0.01 | 4 (13%) | 15 (50%) | 0.14 | 0.03–0.68 | 0.01 |
| Posterior tibial slope | 4 (13%) | 11 (37%) | 0.40 | 0.11–1.43 | 0.2 | 3 (10%) | 11 (37%) | 0.29 | 0.07–1.16 | 0.08 |
* Values are expressed as number of outliers, with percentage in the group in parentheses.