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Evaluations of daily teriparatide using finite-element analysis over 12 months in rheumatoid arthritis patients

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Journal of Bone and Mineral Metabolism Aims and scope Submit manuscript

Abstract

Introduction

The objective of this study was to quantitatively evaluate the effects of daily teriparatide on rheumatoid arthritis patients using predicted bone strength (PBS) assessed by quantitative computed tomography-based finite-element analysis (QCT/FEA) and using bone mineral density (BMD) assessed by dual-energy X-ray absorptiometry (DXA), and to prospectively investigate clinical determinants associated with PBS and BMD increases.

Materials and Methods

Participants comprised 39 patients (mean age, 69 years; disease activity score assessing 28 joints with CRP, 3.0; previous vertebral fractures, 82%) enrolled in this study. BMD by DXA and PBS by QCT/FEA of lumbar spine (LS) and proximal femur were measured at baseline, and after 6 and 12 months. In the groups showing increases in these values, variables that may have affected these increases were evaluated using univariate logistic regression analysis.

Results

Daily teriparatide treatment significantly increased not only LS BMD, but also LS PBS in RA patients with osteoporosis after both 6 and 12 months of treatment. Increases in N-terminal type I procollagen propeptide (PINP) at 1 and 3 months were significantly associated with increased LS PBS at 12 months according to univariate logistic regression analysis. The threshold value for increased PINP at 1 month for increased PBS at 12 months was 75 µg/L.

Conclusions

Increased LS PBS at 12 months was predicted by increased PINP at 1 month from baseline.

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Authors

Contributions

All authors contributed to the study conception and design. Material preparation and data collection were performed by KO, YK, TY, TM and YO. SO and HO contributed to analysis and interpretation of data. The first draft of the manuscript was written by KO and reviewed and edited by SO and ST. All authors commented on previous versions of the manuscript. Final manuscript was supervised by ST, and all authors read and approved the final manuscript.

Corresponding author

Correspondence to Satoru Ohashi.

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All authors have no conflicts of interest.

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Ono, K., Ohashi, S., Oka, H. et al. Evaluations of daily teriparatide using finite-element analysis over 12 months in rheumatoid arthritis patients. J Bone Miner Metab 39, 270–277 (2021). https://doi.org/10.1007/s00774-020-01146-6

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  • DOI: https://doi.org/10.1007/s00774-020-01146-6

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