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Table 3 Mean (SD) bone mineral density ratio (the BMD changes from baseline) for each group by gruen zone at different time points

From: Bone turnover and periprosthetic bone loss after cementless total hip arthroplasty can be restored by zoledronic acid: a prospective, randomized, open-label, controlled trial

Gruen zones 1 2 3 4 5 6 7
12 weeks
 ZA group 1.20(0.74) 1.18(0.28)a 1.13(0.62) 1.07(0.23)a 1.13(0.41) 1.13(0.13)a 1.15(0.21)a
 Control 0.93(0.14) 1.04(0.12) 0.98(0.08) 0.97(0.04) 1.00(0.07) 1.00(0.15) 0.93(0.22)
6 months
 ZA group 1.05(0.19)a 1.13(0.12) 1.05(0.21) 1.04(0.07) 1.04(0.18) 1.14(0.12)a 1.09(0.20)a
 Control 0.92(0.18) 1.07(0.19) 0.99(0.08) 0.97(0.06) 1.01(0.07) 1.02(0.18) 0.88(0.29)
1 year
 ZA group 1.05(0.19)a 1.10(0.10)a 1.00(0.09) 1.03(0.08)a 1.07(0.12)a 1.13(0.13)a 1.07(0.22)a
 Control 0.86(0.24) 0.98(0.25) 0.95(0.22) 0.93(0.20) 0.95(0.24) 0.97(0.28) 0.84(0.29)
2 years
 ZA group 1.08(0.21)a 1.12(0.11) 1.00(0.11) 1.04(0.09)a 1.08(0.15) 1.16(0.13)a 1.06(0.22)a
 Control 0.89(0.14) 1.10(0.46) 1.00(0.08) 0.96(0.07) 1.02(0.10) 1.00(0.19) 0.83(0.20)
  1. astatistically significant difference between the ZA and control groups (P < 0.05)
  2. BMD bone mineral density, SD standard deviation, ZA zoledronic acid