Table 5.
Univariable analysis* of factors associated with femoral component internal rotation directed by the navigation system to obtain a rectangular mediolateral flexion gap (n = 377)
| Factor | Odds ratio | 95% CI | p Value |
|---|---|---|---|
| Age | 1.0 | 0.9–1.0 | 0.185 |
| Sex | 0.812 | ||
| Male (reference) | |||
| Female | 1.1 | 0.4–3.4 | |
| BMI | 0.9 | 0.8–1.1 | 0.249 |
| Surgically treated side | 0.290 | ||
| Right (reference) | |||
| Left | 1.4 | 0.7–2.8 | |
| Preoperative hip-knee-ankle angle | 1.1 | 1.0–1.1 | 0.037† |
| Preoperative medial proximal tibial angle | 1.0 | 0.9–1.1 | 0.850 |
| Preoperative TEA–PCA | 0.9 | 0.8–1.1 | 0.289 |
| PCL resection | 0.702 | ||
| No (reference) | |||
| Yes | 0.9 | 0.44–1.7 | |
| Type of prosthesis | 0.403 | ||
| e. motion® (reference) | |||
| Columbus® | 0.6 | 0.2–1.5 | |
| e. motion® Pro | 0.6 | 0.2–1.7 | |
| Coronal angle of the resected tibia | 1.2 | 0.8–1.9 | 0.350 |
| Extent of the medial release | < 0.001† | ||
| Step 1 (reference) | |||
| Step 2 | 5.9 | 2.3–15 | |
| Step 3 | 24 | 8.4– 66 |
TEA = transepicondylar axis; PCA = posterior condylar axis; all prostheses from B. Braun Aesculap®, Tuttlingen, Germany; *using univariable analysis, only covariates with resulting p value less than 0.15 were included in the backward stepwise multivariable logistic regression analysis; †covariates with a p less than 0.15 were included in multivariable analysis.