Fig. 4From: Comparison of single taper and dual taper versions of the same stem design in total hip arthroplasty for primary osteoarthritisKaplan–Meier curves of the Hydra (in red) and Hydra-fix (in blue) stems: the two versions achieved similar survival rates when the endpoint was revision for any reason. y-axis, percentage of survival implants; x-axis, yearsBack to article page