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09.12.2019 | Original Article

Bone strength of the proximal femur in healthy subjects with ossification of the posterior longitudinal ligament

verfasst von: T. Doi, S. Hirai, M. Kaneko, S. Ohashi, K. Nakajima, F. Oguchi, S. Kato, Y. Taniguchi, Y. Matsubayashi, N. Hayashi, S. Tanaka, Y. Oshima

Erschienen in: Osteoporosis International | Ausgabe 4/2020

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Abstract

Summary

We compared the bone strength measured via quantitative computed tomography-based finite element method (QCT/FEM) between healthy adults with and without ossification of the posterior longitudinal ligament (OPLL). No statistically significant difference was observed in the bone strength between healthy adults with and without OPLL. Hyperostosis of the posterior longitudinal ligament in OPLL may not be associated with the systemic bone strength.

Introduction

Although patients with OPLL have been reportedly associated with increased level of bone mineral density (BMD) using dual-energy X-ray absorptiometry (DXA), little is known about the bone strength in OPLL subjects. The aim of this study is to investigate the bone strength measured via QCT/FEM in healthy subjects with OPLL using the medical check-up data, including whole-body CT scans.

Methods

We examined 796 participants (529 men and 267 women) who underwent CT scans in a single health center between January 2008 and May 2009. We identified OPLL in whole spine and divided the subjects into two groups: non-OPLL and OPLL groups. We calculated the predicted bone strength (PBS) of the proximal femur using QCT/FEM and examined the bone mineral status of the calcaneus using quantitative ultrasound (QUS). We compared the PBS and the QUS parameters between the non-OPLL and OPLL groups.

Results

Seventy-four subjects (9.3%; 57 men and 17 women) were diagnosed with OPLL in the whole spine. The OPLL group was significantly older than the non-OPLL group. No statistically significant difference was observed in the PBS and the QUS parameters between the non-OPLL and OPLL groups in both sexes. Furthermore, no statistically significant difference was noted in the PBS and the QUS parameters between two groups in age- and gender-matched analysis.

Conclusions

Our results suggest that hyperostosis of the posterior longitudinal ligament in OPLL may not be associated with bone strength and bone mineral status at the extremities.

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Titel: Bone strength of the proximal femur in healthy subjects with ossification of the posterior longitudinal ligament
verfasst von: T. Doi
S. Hirai
M. Kaneko
S. Ohashi
K. Nakajima
F. Oguchi
S. Kato
Y. Taniguchi
Y. Matsubayashi
N. Hayashi
S. Tanaka
Y. Oshima
Publikationsdatum: 09.12.2019
Verlag: Springer London
Erschienen in: Osteoporosis International / Ausgabe 4/2020
Print ISSN: 0937-941X
Elektronische ISSN: 1433-2965
DOI: https://doi.org/10.1007/s00198-019-05253-7

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Bone strength of the proximal femur in healthy subjects with ossification of the posterior longitudinal ligament