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