Table 2.
Comparisons of baseline characteristics between groups. The Kruskal-Wallis test was used to compare all variables except gender which was compared with the Fisher’s exact test. Mean (SD) and Median (IQR) values for patient reported outcome measures are shown
| Parameter | Normal bone | Osteopenic bone | Osteoporotic bone | Differences between groups for parameter |
|---|---|---|---|---|
| Mean follow-up (years) | 4.7 (SD 2.4) | 4.7 (SD 2.5) | 6.6 (SD 3) | P = 0.16 |
| Age | 62.9 (SD 8.1) | 70.4 (SD 9.7) | 68 (SD 8.3) | P = 0.01 |
| BMI | 30.9 (SD 6.3) | 27 (SD 4.5) | 27.1 (SD 5.7) | P = 0.06 |
| Gender | 15 females, 5 males | 34 females, 4 males | 11 females, 1 male | P = 0.34 |
| ASA grade | 2.25 (SD 0.6) | 2.16 (SD 0.5) | 2.17 (SD 0.4) | P = 0.76 |
| Preop mean and median OKS | 19.3 (SD 7.8), 17 (IQR 11) | 23.1 (SD 8.8), 23.5 (IQR 15) | 20.4 (SD 7.5), 20.5 (IQR 9) | P = 0.37 |
| Preop mean and median OKS functional subscale score | 10 (SD 3.8), 10 (IQR 6) | 11 (SD 3.9), 11 (IQR 6) | 11.3 (SD 3.7), 12 (IQR 6) | P = 0.58 |
| Preop mean and median OKS pain subscale score | 10.5 (SD 5), 10 (IQR 9) | 11.1 (SD 5.1), 10 (IQR 7) | 11.7 (SD 5.5), 13 (IQR 7) | P = 0.80 |
| Preop mean and median Tegner | 1.7 (SD 1.4), 2 (IQR 3) | 1.9 (SD 0.9), 2 (IQR 2) | 1.5 (SD 1), 1.5 (IQR 1) | P = 0.70 |
| Preop mean and median AKSS-O | 48.7 (SD 14.2), 50 (IQR 14) | 58 (SD 12.8), 59.5 (IQR 16.5) | 50 (SD 14.5), 48 (IQR 11) | P = 0.18 |
| Preop mean and median AKSS-F | 62.1 (SD 16.8), 62.5 (IQR 12.5) | 65.1 (SD 14.3), 70 (IQR 15) | 60 (SD 12.6), 60 (IQR 15) | P = 0.74 |