A Matched Retrospective Analysis: The Relationship Between Testosterone Replacement Therapy and the Incidence of Hip Fractures

Background: The relationship between testosterone replacement therapy (TRT) and hip fractures remains underexplored. This study aims to investigate this relationship. We hypothesize that patients prescribed TRT experience a lower rate of hip fractures compared with a control group. Methods: The PearlDiver Mariner165 data set was used to obtain two random cohorts of 500,000 patients. The experimental group received TRT for at least 3 months and the control group did not. We used one-to-one matching to evaluate the effects of TRT in 301,724 patients. The incidence of hip fractures was assessed over a 2-year follow-up using the International Classifications of Disease codes. Multivariable logistic regression identified the association between TRT and hip fractures. Statistical significance was set at P < 0.05. Results: The patients in the TRT group were associated with a lower incidence of hip fractures compared with the control group (0.13% vs. 0.25%, P < 0.001). The multivariable analysis showed that TRT use was associated with a decreased incidence of hip fractures with an adjusted odds ratio (aOR) of 0.58 (95% confidence interval [CI], 0.51 to 0.66, P < 0.001). After stratifying by sex, the multivariable analysis showed that TRT use in male patients was associated with a decreased incidence of hip fractures with an aOR of 0.61 (95% CI, 0.53 to 0.72, P < 0.001); in female patients, it was associated with a decreased incidence of hip fractures with an aOR of 0.49 (95% CI, 0.38 to 0.63, P < 0.001). Conclusion: Patients prescribed TRT had a 1.9 times lower likelihood of sustaining hip fractures. Further investigation into the association of TRT and fragility fractures garners continued interest. In addition, this can provide insight into the potential benefits of TRT use and maintaining bone health to improve bone mass and improve results of orthopaedic interventions. Level of Evidence: III