Table 1.
Descriptive statistics for five measurement parameters
| Measurement parameter | Radiograph | 3D CT/2D CT* | ||||||
|---|---|---|---|---|---|---|---|---|
| Trial 1† | Trial 2 | Trial 1 | Trial 2 | |||||
| Mean | SD | Mean | SD | Mean | SD | Mean | SD | |
| M/L displacement‡ | 25.1 | 10.3 | 22.6 | 10.8 | 47.1 | 30.0 | 43.0 | 30.9 |
| Translation‡ | 12.8 | 7.9 | 14.0 | 6.8 | 21.6 | 16.5 | 22.4 | 14.2 |
| Angulation (°) | 12.5 | 10.3 | 11.6 | 11.0 | 19.4 | 11.2 | 17.7 | 12.7 |
| GPA (°) | 28.2 | 6.8 | 27.1 | 6.6 | 34.1 | 5.5 | 34.1 | 5.6 |
| Glenoid version (°) | NA | NA | NA | NA | 8.0 | 9.8 | 8.4 | 9.5 |
* M/L displacement, translation, angulation and GPA were measured on 3D CT; glenoid version was measured on 2D CT; †three observers’ readings were pooled for each trial; ‡linear units for M/L displacement and translation were millimeters for radiographs and pixels for 3D CT; 3D = three-dimensional; 2D = two-dimensional; M/L = medial/lateral; GPA = glenopolar angle; NA = not applicable.