Table 2 Radiographic measurements of LDFA and ATJL with flexion and rotation error
Flexion and rotation error | Preoperative LDFA (°) | Preop. LDFA diff. to reference (°) | Postoperative LDFA (°) | Postop. LDFA diff. to reference (°) | Preoperative ATJL (mm) | ATJL diff. to reference (mm) | Postoperative ATJL (mm) | Postoperative ATJL diff. to reference (mm) | |
|---|---|---|---|---|---|---|---|---|---|
0° flexion | +0° rotation | 91.6 (± 0.2) | 93.7 (± 0.3) | 49.3 (± 0.1) | 46.9 (± 0.4) | ||||
0° flexion | +5° internal rotation | 92.4 (± 0.3) | 0.9 (± 0.3) | 94.9 (± 0.3) | 1.2 (± 0.2) | 48.9 (± 0.3) | -0.4 (± 0.3) | 46.9 (± 0.2) | 0.0 (± 0.3) |
0° flexion | +5° external rotation | 90.7 (± 0.3) | -0.9 (± 0.3) | 92.8 (± 0.3) | -0.9 (± 0.1) | 49.9 (± 0.9) | 0.2 (± 0.2) | 47.4 (± 0.1) | 0.5 (± 0.4) |
5° flexion | +0° rotation | 91.8 (± 0.2) | 0.3 (± 0.2) | 93.7 (± 0.1) | 0.0 (± 0.2) | 49.4 (± 0.3) | 0.2 (± 0.4) | 47.8 (± 0.1) | 0.9 (± 0.3) |
5° flexion | +5° internal rotation | 91.9 (± 0.1) | 0.3 (± 0.1) | 93.9 (± 0.1) | 0.2 (± 0.1) | 49.3 (± 0.6) | 0.0 (± 0.6) | 48.3 (± 0.2) | 1.4 (± 0.2) |
5° flexion | +5° external rotation | 91.7 (± 0.7) | 0.1 (± 0.5) | 93.2 (± 0.2) | -0.5 (± 0.1) | 49.8 (± 0.6) | 0.5 (± 0.6) | 48.1 (± 0.1) | 1.2 (± 0.4) |
10° flexion | +0° rotation | 92.3 (± 0.2) | 0.7 (± 0.1) | 93.8 (± 0.3) | 0.1 (± 0.1) | 49.5 (± 0.5) | 0.2 (± 0.6) | 49.1 (± 0.2) | 2.2 (± 0.2) |
10° flexion | +5° internal rotation | 92.1 (± 0.1) | 0.5 (± 0.3) | 93.5 (± 0.3) | -0.2 (± 0.3) | 49.6 (± 0.6) | 0.3 (± 0.7) | 49.1 (± 0.3) | 2.2 (± 0.2) |
10° flexion | +5° external rotation | 92.3 (± 0.4) | 0.7 (± 0.2) | 93.9 (± 0.2) | 0.2 (± 0.4) | 49.9 (± 0.7) | 0.6 (± 0.7) | 49.2 (± 0.3) | 2.3 (± 0.1) |