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Table 1 Deviations from preoperative mechanical leg axis in subtrochanteric osteotomies

From: The impact of mal-angulated femoral rotational osteotomies on mechanical leg axis: a computer simulation model

Angulation Error of the Osteotomy Plane

Plane

Error in the Mechanical Leg Axis Alignment per Rotation

10°

15°

20°

30°

+/−  5°

Sagittal

0.2° ± 0.2°

0.3° ± 0.3°

0.4° ± 0.3°

0.5° ± 0.4°

0.7° ± 0.5°

Frontal

0.1° ± 0.1°

0.2° ± 0.1°

0.2° ± 0.1°

0.3° ± 0.2°

0.4° ± 0.2°

+/− 10°

Sagittal

0.2° ± 0.1°

0.5° ± 0.2°

0.7° ± 0.3°

0.9° ± 0.3°

1.4° ± 0.4°

Frontal

0.1° ± 0.0°

0.2° ± 0.1°

0.3° ± 0.1°

0.3° ± 0.1°

0.4° ± 0.3°

+/−  15°

Sagittal

0.3° ± 0.1°

0.7° ± 0.2°

1.0° ± 0.3°

1.4° ± 0.3°

2.1° ± 0.4°

Frontal

0.1° ± 0.0°

0.2° ± 0.1°

0.3° ± 0.1°

0.4° ± 0.1°

0.5° ± 0.3°

+/− 20°

Sagittal

0.5° ± 0.1°

0.9° ± 0.2°

1.4° ± 0.3°

1.8° ± 0.3°

2.8° ± 0.4°

Frontal

0.2° ± 0.0°

0.3° ± 0.1°

0.4° ± 0.0°

0.5° ± 0.0°

0.5° ± 0.2°

+/−  30°

Sagittal

0.7° ± 0.1°

1.3° ± 0.2°

2.0° ± 0.2°

2.7° ± 0.3°

4.0° ± 0.4°

Frontal

0.2° ± 0.1°

0.3° ± 0.1°

0.5° ± 0.1°

0.6° ± 0.1°

0.6° ± 0.2°

  1. Errors in mechanical leg axis greater than 2° (mean value plus standard deviation) have been marked bold