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Standardization of RSA Examinations at Each Center
| Characteristic | Center 1 | Center 2 |
| Patient position | Supine (operated leg parallel to the y axis of the cage) | Supine (operated leg parallel to the y axis of the cage) |
| Angle between the ceiling-mounted radiographic RSA tubes | 46° | 42° |
| Source-to-image detector distance | 150 cm | 160 cm |
| Type of uniplanar calibration cage | CarbonBox 021 (MEDIS Medical Imaging Systems) | Cage 77(RSA Biomedical) |
| Image detector | Carestream DRX-1 | Canon CXDI-50RF |
