Takahashi K, Shimizu T, Asano T, et al. - This research was undertaken to investigate long-term clinical and radiological outcomes of primary total hip arthroplasty (THA) applying the original or modified modular hip system in middle-aged Asian patients. Researchers conducted a retrospective review identifying a total of 98 primary THAs that applied a modular stem and were undertaken between 1997 and 2009 in patients younger than 58 years, for whom at least 5 years of follow-up data were available. They examined clinical data and radiograph evaluations to examine differences between the original and modified modular stem groups. The data of this research exhibit that the modular stems have a high survival rate, and outcomes imply positive outcomes among the Asian population over the long term. The outcomes imply that the modified modular stem could prevent thigh pain and that selection of the implant based on the bone shape is important for THA, although there were very few differences between the stem designs.