Validation of the AO Spine Osteoporotic Fracture Classification—effect of geographical region on reliability and reproducibility
Authors' conclusion
The AO Spine-DGOU Osteoporotic Fracture Classification System demonstrates moderate to substantial reliability and reproducibility, with regional differences influenced by factors such as training and clinical experience.
Study context
- Population
- Participants from various global regions classifying 27 cases of osteoporotic vertebral fractures with the AO Spine-DGOU system (OF 1-OF 5) after online webinar training27 cases
- Participants
- 320 participants
- Comparison
- Geographic regions of raters classifying osteoporotic vertebral fractures
- Outcome
- Reliability and reproducibility of the AO Spine-DGOU Osteoporotic Fracture Classification by geographic region (Fleiss' kappa; agreement with gold standard)
Methodological detailsinternational, interobserver reliability and intraobserver reproducibility, Fleiss' kappa, gold standard committee comparison
- International
- Interobserver reliability and intraobserver reproducibility
- Fleiss' kappa
- Gold standard committee comparison
Main finding
As reported in the abstract
Agreement with gold standard (kappa)
Global agreement with gold standard, initial kappa (moderate to substantial)
0.58
Global agreement with gold standard, improved kappa
0.61
European participants, highest agreement (kappa)
0.64 and 0.66
Further findings
Kappa
| Outcome | German-speaking | Other Europeans | P value |
|---|---|---|---|
| Reliability, German-speaking vs other European participants (post hoc analysis)Post hoc analysis | 0.79 | 0.70 | P = 0.0026 |
Original publication
Validation of the AO Spine Osteoporotic Fracture Classification—effect of geographical region on reliability and reproducibility. Osteoporos Int. Published 13 August 2026. doi:10.
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