Skip to main content

Table 2 Mean (SD) BMD (g/cm2) in the 4 ROIs around the stem and in both ankles (operated and non-operated contralateral legs)

From: Quantitative measurements of adaptive bone remodeling around the cemented Zimmer® segmental stem after tumor resection arthroplasty using dual-energy x-ray absorptiometry

Follow-up Postoperative (n = 21) 3 months (n = 18) 6 months (n = 21) 12 months (n = 21) p-value#
0–12 months (n = 18)
ROI1, BMD 2.186 (0.38) 2.056 (0.48) 1.990 (0.46) 1.874 (0.27) 0.037
 ΔBMD%   −6% −9% − 14%  
p values (stepwise)*
CI (95%)
  0.285 (−0.10–0.33) 0.092 (− 0.04–0.43) 0.004 (0.11–0.52)  
ROI2, BMD 2.248 (0.41) 2.075 (0.53) 2.238 (0.57) 1.914 (0.30) 0.071
ΔBMD%   −8% −0.4% −15%  
p values (stepwise)*
CI (95%)
  0.366 (−0.15–0.37) 0.95 (− 0.28–0.30) 0.003 (0.13–0.54)  
ROI3, BMD 2.215 (0.43) 2.075 (0.49) 2.071 (0.38) 1.978 (0.3) 0.223
ΔBMD%   −6% - 7% −11%  
p values (stepwise)*
CI (95%)
  0.438 (−0.16–0.35) 0.117 (− 0.04–0.33) 0.005 (0.08–0.39)  
ROI4, BMD 2.080 (0.42) 2.047 (0.44) 1.948 (0.45) 1.923 (0.45) 0.009
ΔBMD%   −2% −4% −8%  
p values (stepwise)*
CI (95%)
  0.356 (−0.04–0.11) 0.079 (−0.01–0.18) < 0.0001 (0.09–0.22)  
Ankle operated, BMD 0.751 (0.15) 0.7048 (0.14) 0.7049 (0.17) 0.681 (0.16) < 0.001
ΔBMD%   −6% −6% −9%  
p values (stepwise)*
CI (95%)
  0.008 (0.01–0.06) 0.008 (0.02–0.09) < 0.001 (0.05–0.11)  
Ankle contralateral, BMD 0.806 (0.19) 0.793 (0.18) 0.814 (0.25) 0.788 (0.17) 0.322
ΔBMD%   −2% + 1% −2%  
p values (stepwise)*
CI (95%)
  0.12 (−0.01–0.05) 0.90 (−0.08–0.07) 0.12 (− 0.01–0.05)  
  1. *students paired t-test, #repeated measures ANOVA