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The calculation of the actual joint line obliquity (aJLO) in the case of a neutral knee with an apex distal JLO, which has its mechanical axis (MA) vertical to the ground. α angle = 90° - lateral distal femoral angle (LDFA). β angle = 90° - medial proximal tibial angle (MPTA). Both α angle and β angle each contributes to half of the apex distal JLO, so the aJLO to the ground should be calculated as aJLO = (α+β)/2, which is 90° - (LDFA+ MPTA)/2.
