Kaneuji A, Takahashi E, Fukui M, et al. - This study was sought to explore if the proximal circumferential porous coating of cementless stems would make implant survival of > 20 years possible in young patients. Researchers examined data for patients younger than 50 years with hip dysplasia who had an anatomic stem implanted with a proximal porous coating with hydroxyapatite/tricalcium phosphate. They applied noncircumferential porous (non-C-type) stems in 17 hips (13 cases), and circumferential porous (C-type) stems were applied in 87 hips (68 cases). The results of this study exhibited that the anatomic femoral stems with a circumferential porous coating provide excellent durability in patients with hip dysplasia who are 50 years of age or younger.