Table 1.

High (+) and low (−) values of the independent variables for the non-modular control group and modular neck intervention group

Femoral head diameter (mm)	Acetabular rotation centre depth (mm)	Femoral head offset (mm)	Femoral neck offset	Femoral neck-shaft angle (°)	Femoral stem length (mm)
Non-modular control group
(+) 36	0	+3.5	High offset	125	110
(−) 28	+2	−3.5	Std offset	135	170

Femoral head diameter (mm)	Acetabular rotation centre depth (mm)	Femoral head offset (mm)	Femoral neck offset (mm)	Neck anteversion/retroversion	Modular neck varus/valgus
Modular neck intervention group
(+) 36	0	+3.5	Long (38.5)	15° Ante	15° Varus
(−) 28	+1	−3.5	Short (28)	15° Retro	15° Valgus