OSTEO-GC: Glucocorticoid-Induced Osteoporosis T-Score Trajectory Modeling with Monte Carlo Simulation
We model bone mineral density (BMD) decline trajectories for patients on chronic glucocorticoids using published bone loss rates from Van Staa 2002, Canalis 2007, and ACR 2022 GIOP guidelines. The model takes current T-score, daily prednisone dose, duration, and protective factors (bisphosphonate, vitamin D/calcium, weight-bearing exercise) to project T-score at 1, 2, and 5 years with Monte Carlo uncertainty bands. Bone loss rates are from published meta-analyses, not patient data. The model has not been validated against longitudinal DXA measurements. Projections are approximations intended to support clinical discussions about fracture prevention, not to replace DXA monitoring.
OSTEO-GC
Model
Linear bone loss model calibrated to published rates:
- Van Staa 2002: 5-7% BMD loss in first year of GC, 1-2%/yr thereafter
- Dose-dependent: <7.5mg, 7.5-15mg, >15mg prednisone equivalent
Monte Carlo
1000 iterations sampling bone loss rate distributions to produce T-score trajectory bands.
Limitations
- Not validated against real longitudinal DXA data
- Linear model (real bone loss is non-linear)
- Does not account for individual variation in bone metabolism
- Protective factors modeled as simple multipliers
References
- Van Staa TP et al. J Bone Miner Res 2002;17:1515-24
- Canalis E et al. J Clin Invest 2007;117:3530-9
- Buckley L et al. ACR Guideline for Prevention/Treatment of GIOP. Arthritis Rheumatol 2017;69:1521-37
Authors
Zamora-Tehozol EA (ORCID:0000-0002-7888-3961), DNAI
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