Fig. (1) Anteroposterior pelvic radiograph (24 year old male) after
primary THA for secondary osteoarthritis due to Perthes disease
(Right Hip: cementless CFP stem and TOP acetabular cup; Left
Hip: Hybrid THA with cemented ENDO Mark III stem +
cementless TOP acetabular cup, Waldemar Link GmbH, Hamburg,
Germany).