Table 2 Definition of the surgically modifiable factors (SMF)

Femoral Joint Line Change max.

FJLCmax

Femoral joint line change from the most prominent condyle

Millimeter

Femoral Joint Line Change min.

FJLCmin

Femoral joint line change from the less prominent condyle

Millimeter

Femoral Component Slope

FS

Femoral component angle in the sagittal plane

Degrees

Tibial Joint Line Change

TJLC

Tibial joint line change from the unworn compartment

Millimeter

Tibial Component Slope

TCS

Tibial component angle in the sagittal plane

Degrees

Extension Gap Size Medial

EGSmed

Medial gap between the femoral and tibial components in extension

Millimeter

Extension Gap Size Lateral

EGSlat

Lateral gap between the femoral and tibial components in extension

Millimeter

Extension Gap Difference Medial-Lateral

EGDM-L

Difference between EGSmed and EGSlat (EG symmetry)

Millimeter

Flexion Gap Size Medial

FGSmed

Medial gap between the femoral and tibial components in 90° flexion

Millimeter

Flexion Gap Size Lateral

FGSlat

Lateral gap between the femoral and tibial components in 90° flexion

Millimeter

Flexion Gap Difference Medial-Lateral

FGDM-L

Difference between FGSmed and FGSlat (FG symmetry)

Millimeter

Flexion Extension Gap Difference

FEGD

Difference between the mean EGS and the mean FGS (Gap equality)

Millimeter

Femoral Offset Changes Medial

FOCmed

Difference between the medial FO before and after femoral component implantation

Millimeter

Femoral Offset Changes Lateral

FOClat

Difference between the lateral FO before and after femoral component implantation

Millimeter

Femoral Rotation

FR

Femoral rotation relative to the posterior condyle line

Degrees