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ORIGINAL ARTICLE
Year : 2019  |  Volume : 53  |  Issue : 2  |  Page : 340-346

Intermittent parathyroid hormone injection can decrease femoral head collapse in the vascular deprivation of rat femoral head model


1 Bone and Joint Research Center, Department of Orthopedics and Traumatology Taipei Medical University Hospital, School of Medicine, College of Medicine, Taipei Medical University, Taipei 110; Graduate Institiute of Biomedical Electronics and Bioinformatics, National Taiwan University, Taipei 106, Taiwan
2 Bone and Joint Research Center, Department of Orthopedics and Traumatology Taipei Medical University Hospital, School of Medicine, College of Medicine, Taipei Medical University, Taipei 110, Taiwan
3 Bone and Joint Research Center, Department of Orthopedics and Traumatology Taipei Medical University Hospital, School of Medicine, College of Medicine; Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei 110, Taiwan

Correspondence Address:
Dr. Chih-Wei Chiang
Department of Orthopedics and Traumatology, Taipei Medical University Hospital, 252, Wu-Hsin Street, Taipei (110)
Taiwan
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ortho.IJOrtho_315_17

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Backgrounds: Intermittent parathyroid hormone (intermittent PTH) injection has been shown to improve osteogenesis. We hypothesized that intermittent PTH injection could stimulate osteogenesis during the early phase of vascular deprivation-induced femoral neck osteonecrosis in a rat model. Materials and Methods: Eighteen Sprague-Dawley rats were divided into three groups (normal saline [CON], PTH 10 μg/kg [PTH-H], and PTH 1 μg/kg [PTH-L]) for 8 weeks by subcutaneous injection. All rats were sacrificed at postoperative 8 weeks, and all underwent a micro-computed tomography (μ-CT) examination for bone quality and quantity evaluation and histomorphometric analysis for microscopic histologic differences. Results: Under μ-CT examination, both the PTH-H and PTH-L groups revealed less bone resorption than the control group. The PTH-H group had a better bone protective effect than the PTH-L group. Bone mineral density was increased in the PTH-H and PTH-L groups compared to the control group. The uninjured left femoral head was enlarged in both PTH groups. The histologic examination showed that both PTH groups had new bone and cartilage formation. The control group had only dead bone without any osteogenesis. Conclusion: Intermittent PTH injection could decrease bone resorption and improve bone density, compared to the control group, in vascular deprivation of the femoral head in a rat model. High-level intermittent PTH injection had a better effect than low-level intermittent PTH injection.


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