<qa>  What is the effect of Zoledronic acid treatment on vertical translation of acetabulMeanwhile to assess efficacy of Zoledronic acid treatment on the vertical translation of acetabulum and the subsidence translation of femoral stem by RadiostereometryRSA, prevention of peri- prosthetic bone loss by observing the local average bone mineral density BMD changes for 7 femoral region Gruen zones through Dual Energy X-ray Absorptiometry DXAscans, et al. 