Table 3.
General results of radiographic measurements
| View | Observer | Reading | n | M0 | M36 | ΔM36–M0 | |||||||||
| Mean (mm) | SD | Min | Max | Mean (mm) | SD | Min | Max | Mean (mm) | SD | Min | Max | ||||
| Pelvic | 1 | 1 | 50 | 2.33 | 0.81 | 0.70 | 4.10 | 1.93 | 1.06 | 0.0 | 4.40 | -0.40 | 0.65 | -2.10 | +0.80 |
| 2 | 50 | 2.34 | 0.81 | 0.70 | 4.20 | 1.85 | 0.97 | 0.0 | 4.10 | -0.49 | 0.54 | -1.90 | +0.40 | ||
| 2 | 1 | 50 | 2.67 | 1.07 | 0.90 | 5.50 | 2.13 | 1.35 | 0.0 | 5.50 | -0.54 | 0.66 | -2.30 | +0.40 | |
| 2 | 50 | 2.66 | 1.02 | 0.70 | 5.10 | 2.16 | 1.31 | 0.0 | 5.20 | -0.49 | 0.67 | -2.20 | +0.20 | ||
| Mean (1 + 2) | 1 | 50 | 2.50 | 0.91 | 0.70 | 4.65 | 2.03 | 1.17 | 0.0 | 4.95 | -0.47 | 0.62 | -2.05 | +0.45 | |
| 2 | 50 | 2.50 | 0.89 | 0.70 | 4.50 | 2.01 | 1.11 | 0.0 | 4.55 | -0.49 | 0.57 | -2.05 | +0.30 | ||
| Hip AP | 1 | 1 | 50 | 2.41 | 0.86 | 0.70 | 4.30 | 2.02 | 1.13 | 0.0 | 4.40 | -0.39 | 0.61 | -2.00 | +0.60 |
| 2 | 50 | 2.40 | 0.86 | 0.80 | 4.50 | 1.94 | 1.07 | 0.0 | 4.30 | -0.46 | 0.59 | -1.90 | +0.70 | ||
| 2 | 1 | 50 | 2.69 | 1.05 | 0.60 | 5.50 | 2.19 | 1.34 | 0.0 | 5.50 | -0.49 | 0.66 | -2.10 | +0.50 | |
| 2 | 50 | 2.68 | 1.01 | 0.70 | 5.50 | 2.19 | 1.30 | 0.0 | 5.00 | -0.49 | 0.66 | -2.20 | +0.60 | ||
| Mean (1 + 2) | 1 | 50 | 2.55 | 0.94 | 0.65 | 4.90 | 2.11 | 1.22 | 0.0 | 4.95 | -0.44 | 0.62 | -2.05 | +0.55 | |
| 2 | 50 | 2.54 | 0.92 | 0.75 | 5.00 | 2.06 | 1.17 | 0.0 | 4.55 | -0.48 | 0.60 | -1.95 | +0.65 | ||
| Oblique | 1 | 1 | 50 | 2.37 | 0.79 | 0.70 | 3.70 | 1.92 | 1.05 | 0.0 | 3.80 | -0.46 | 0.59 | -2.20 | +0.50 |
| 2 | 50 | 2.29 | 0.78 | 0.40 | 3.60 | 1.92 | 1.02 | 0.0 | 4.10 | -0.37 | 0.50 | -1.70 | +0.70 | ||
| 2 | 1 | 50 | 2.69 | 1.00 | 0.50 | 5.00 | 2.21 | 1.28 | 0.0 | 5.00 | -0.47 | 0.67 | -2.40 | +1.20 | |
| 2 | 50 | 2.70 | 1.01 | 0.60 | 5.00 | 2.18 | 1.27 | 0.0 | 5.00 | -0.52 | 0.64 | -2.30 | +0.20 | ||
| Mean (1 + 2) | 1 | 50 | 2.53 | 0.85 | 0.75 | 4.15 | 2.07 | 1.13 | 0.0 | 3.95 | -0.46 | 0.61 | -2.15 | +0.65 | |
| 2 | 50 | 2.50 | 0.87 | 0.50 | 4.20 | 2.05 | 1.13 | 0.0 | 4.95 | -0.45 | 0.53 | -1.95 | +0.35 | ||
Shown are the general results of radiographic measurements of joint space width (JSW) at baseline (M0) and 36 months (M36), and the joint space change for the three views and two observers (and their mean and SD). AP, anteroposterior; Δ, difference; SD, standard deviation.