Total hip arthroplasty with an HPF stem: the radiological findings around the cementless anatomical-shape stem for developmental dysplasia of the hip

The clinical performance was excellent. Total or proximal fit was seen in only 30%. In these joints, cortical hypertrophy at the middle part of the stem and slight proximal bone atrophy appeared frequently, suggesting the stress transmission to the stem middle or distal portion, and there is a limit to the stress shielding evasion by the anatomical-shape stem.