Table 3.
Comparisons of postoperative alignments in the standard instrumentation group of 185 knees stratified by anatomical feature severity*
| Grade | mTFA | cFPA | cTPA |
|---|---|---|---|
| Femoral bowing angle | < 0.001† | < 0.001† | 0.020† |
| Medial bowing (≥ 0°) (n = 24) | 1.0 (2.3) | 0.0 (2.1) | 0.2 (1.1) |
| Mild lateral bowing (−5° ≤ < 0°) (n = 85) | 0.4 (2.9) | −0.6 (1.3) | 0.4 (1.8) |
| Severe lateral bowing (−10 ° ≤ < −5°) (n = 47) | −0.5 (2.9) | −1.0 (1.6) | 0.4 (1.6) |
| Very severe lateral bowing (< −10°) (n = 29) | −2.3 (2.7) | −1.7 (1.6) | −0.6 (1.6) |
| Femoral condylar orientation | < 0.001† | < 0.001† | NS† |
| Valgus (≥ 0°) (n = 31) | 1.3 (2.8) | 0.0 (1.8) | 0.3 (1.2) |
| Mild varus (−3° ≤ < 0°) (n = 85) | 0.1 (2.9) | −0.7 (1.5) | 0.4 (1.6) |
| Severe varus (< −3°) (n = 69) | −1.2 (2.7) | −1.4 (1.5) | 0.1 (1.9) |
| Tibia plateau inclination | NS† | NS† | NS† |
| Valgus (≥ 0°) (n = 2) | 0.5 (3.5) | 1.0 (2.8) | 0.0 (0.0) |
| Mild varus (−3° ≤ < 0°) (n = 12) | 0.8 (1.2) | −0.6 (0.8) | 0.7 (1.1) |
| Severe varus (−5° ≤ < −3°) (n = 23) | −0.1 (3.4) | −1.1 (2.3) | 0.1 (1.2) |
| Very severe varus (< −5°) (n = 148) | −0.3 (3.0) | −0.8 (1.5) | 0.2 (1.8) |
* Data are given as mean angles with SDs in parentheses; †the significances of differences between subgroups were determined by analysis of variance with Bonferroni’s post hoc test. Values significantly different from the others after post hoc testing are presented in bold font; mTFA = mechanical tibiofemoral angle; cFPA = coronal femoral prosthesis alignment; cTPA = coronal tibial prosthesis alignment; NS = not significant.