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Teriparatide improves volumetric bone mineral density and fine bone structure in the UIV+1 vertebra, and reduces bone failure type PJK after surgery for adult spinal deformity

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Abstract

Summary

We conducted a prospective comparative study of the effect of teriparatide therapy for preventing vertebral-failure-type PJK after reconstructive surgery for adult spinal deformity. Prophylactic teriparatide improved the volumetric bone mineral density and fine bone structure of the vertebra above the upper-instrumented vertebra and reduced the incidence of vertebral-failure-type PJK.

Introduction

Proximal junctional kyphosis (PJK) is a complication after corrective surgery for spinal deformity. This study sought to determine whether teriparatide (TP) is an effective prophylactic against PJK type 2 (vertebral fracture) in surgically treated patients with adult spinal deformity (ASD).

Methods

Forty-three patients who started TP therapy immediately after surgery and 33 patients who did not receive TP were enrolled in this prospective case series. These patients were female, over 50, surgically treated for ASD, and followed for at least 2 years. Preoperative and postoperative standing whole-spine X-rays and dual-energy X-ray absorptiometry scans, and multidetector CT images obtained before and 6 months after surgery were used to analyze the bone strength in the vertebra above the upper-instrumented vertebra (UIV+1).

Results

Mean age was 67.9 years. After 6 months of treatment, mean hip-bone mineral density (BMD) increased from 0.721 to 0.771 g/cm2 in the TP group and decreased from 0.759 to 0.729 g/cm2 in the control group. This percent BMD change between groups was significant (p < 0.05). The volumetric BMD (326 to 366 mg/cm3) and bone mineral content (BMC) (553 to 622 mg) at UIV+1 were also significantly increased in TP group. The bone volume/tissue volume ratio increased from 46 to 54 % in the TP group, and the trabecular bone thickness and number increased by 14 and 5 %, respectively. At the 2-year follow-up, the PJK type 2 incidence was significantly lower in the TP group (4.6 %) than in the control group (15.2 %; p = .02).

Conclusions

Prophylactic TP treatment improved the volumetric BMD and fine bone structure at UIV+1 and reduced the PJK-type 2 incidence.

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Authors and Affiliations

  1. Department of Orthopedic Surgery, National Hospital Organization Murayama Medical Center, 2-37-1, Musahsimurayama City Gakuen, Tokyo, Japan

    M. Yagi, H. Ohne, T. Konomi, K. Fujiyoshi, S. Kaneko, T. Komiyama, M. Takemitsu, Y. Yato, M. Machida & T. Asazuma

  2. Department of Orthopedic Surgery, Keio University School of Medicine, Tokyo, Japan

    M. Yagi

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  1. M. Yagi
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  2. H. Ohne
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  3. T. Konomi
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Correspondence to M. Yagi.

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This study was approved by the appropriate institutional review board.

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Yagi, M., Ohne, H., Konomi, T. et al. Teriparatide improves volumetric bone mineral density and fine bone structure in the UIV+1 vertebra, and reduces bone failure type PJK after surgery for adult spinal deformity. Osteoporos Int 27, 3495–3502 (2016). https://doi.org/10.1007/s00198-016-3676-6

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  • DOI: https://doi.org/10.1007/s00198-016-3676-6

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