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Osteoporosis International

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01-11-2017 | Original Article

Precision of bone density and micro-architectural properties at the distal radius and tibia in children: an HR-pQCT study

Authors: C. E. Kawalilak, A. T. Bunyamin, K. M. Björkman, J. D. Johnston, S. A. Kontulainen

Published in: Osteoporosis International | Issue 11/2017

Abstract

Summary

Precision errors need to be known when monitoring bone micro-architecture in children with HR-pQCT. Precision errors for trabecular bone micro-architecture ranged from 1 to 8% when using the standard evaluation at the radius and tibia. Precision errors for cortical bone micro-architecture ranged from 1 to 11% when using the advanced cortical evaluation.

Introduction

Our objective was to define HR-pQCT precision errors (CV%_RMS) and least significant changes (LSCs) at the distal radius and tibia in children using the standard evaluation and the advanced cortical evaluation.

Methods

We scanned the distal radius (7% of ulnar length) and tibia (8% of tibia length) of 32 children (age range 8–13; mean age 11.3; SD 1.6 years) twice (1 week apart) using HR-pQCT (XtremeCT1). We calculated root-mean-squared coefficients of variation (CV%_RMS) to define precision errors and LSC to identify differences required to detect change.

Results

Precision errors ranged between 1–8 and 1–5% for trabecular bone outcomes (obtained with standard evaluation) and between 1.5–11 and 0.5–6% for cortical bone outcomes (obtained with advanced cortical evaluation) at the distal radius and tibia, respectively. Related LSCs ranged between 3–21 and 3–14% for trabecular bone outcomes and between 4–30 and 2–16% for cortical bone outcomes at the distal radius and tibia, respectively.

Conclusions

HR-pQCT precision errors were between 1 and 8% (LSC 3–21%) for trabecular bone outcomes and 1 and 11% (LSC 2–30%) for cortical bone outcomes at the radius and tibia in children. Cortical bone outcomes obtained using the advanced cortical evaluation appeared to have lower precision errors than cortical outcomes derived using the standard evaluation. These findings, combined with better-defined cortical bone contours with advanced cortical evaluation, indicate that metrics from advanced cortical evaluation should be utilized when monitoring cortical bone properties in children.

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Title: Precision of bone density and micro-architectural properties at the distal radius and tibia in children: an HR-pQCT study
Authors: C. E. Kawalilak
A. T. Bunyamin
K. M. Björkman
J. D. Johnston
S. A. Kontulainen
Publication date: 01-11-2017
Publisher: Springer London
Published in: Osteoporosis International / Issue 11/2017
Print ISSN: 0937-941X
Electronic ISSN: 1433-2965
DOI: https://doi.org/10.1007/s00198-017-4185-y

At a glance: The STEP trials

Springer Medicine

Precision of bone density and micro-architectural properties at the distal radius and tibia in children: an HR-pQCT study

Abstract

Summary

Introduction

Methods

Results

Conclusions

At a glance: The STEP trials

Springer Medicine

Abstract

Summary

Introduction

Methods

Results

Conclusions

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