Table 4.

Ideal osteotomy level tolerating a mechanical lateral distal femoral angle (mLDFA) of ≥ 85° and a mechanical medial proximal tibial angle (mMPTA) of ≤ 90° (anatomic correction) with regard to the amount of varus malalignment

Ideal osteotomy level	Varus malalignment (mFTA)
	Mild (3°–5°) (%)	Moderate (6°–8°) (%)	Severe (≥ 9°) (%)
Tibial	18a	3	0
Femoral	11	4	0
Double-level	59	72	56
Uncorrectable	12	20	44b

Values are shown as percentages per group

mFTA mechanical femorotibial angle

^aSignificant difference compared to 6°–8° and ≥ 9° mFTA (p < 0.001) (Qui-square test followed by post hoc tests with Bonferroni correction)

^bSignificant difference compared to 3°–5° and 6°–8° (p < 0.001 and p = 0.034) (Qui-square test followed by post hoc tests with Bonferroni correction)