In the related studies presented at the
annual meeting, «Trends in Total Hip Arthroplasty in the United States: The Shift to a Younger Demographic» and «Trends in Total Knee Arthroplasty in the United States: Understanding the Shift to a Younger Demographic,» researchers conducted a retrospective
review of 2000 - 2009 hospital discharge data on TKR and THR patients from the Nationwide Inpatient Sample (NIS) Healthcare Cost and
Utilization Project (HCUP).