| PTOA | Post-traumatic osteoarthritis |
| TKR | Total knee replacement |
| IPTW | Inverse probability of treatment weighting |
| OA | Osteoarthritis |
| OP | Osteoporosis |
| SERM | Selective estrogen receptor modulators |
| ICD | International Classification of Diseases |
| PDC | Proportion of days covered |
| ANOVA | One-way analysis of variance |
| HR | Hazard Ratios |
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