Both total hip arthroplasty (THA) and total knee arthroplasty (TKA) are deemed to be highly successful and cost-effective procedures for relieving pain and improving function. However, some studies have reported better pain relief and functional improvement after THA (Int J Technol Assess Health Care. 1997 Fall;13[4]:575-88, and J Arthroplasty. 1995 Dec;10[6]:742-7). It is certainly possible th...