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Concordant bone mineral density measurement of non-dominant forearm in supine and sitting positions
Journal of Clinical Densitometry ( IF 2.5 ) Pub Date : 2022-04-18 , DOI: 10.1016/j.jocd.2022.02.022
Tsz Kit Chow

Introduction

According to ISCD position statement, bone mineral density (BMD) should be measured at spine and hip in all patients. In certain circumstances, BMD of non-dominant forearm should also be measured, such as in patients whose hip and/or spine cannot be measured, those with hyperparathyroidism or very obese patients. The forearm can either be scanned in supine and sitting position. However, there may be significant difference in measured BMD when forearm is scanned in different positions, hence affecting the diagnosis and management.

Objectives

The purpose of this study was to assess whether the measured non-dominant forearm BMD between scanning in supine and sitting positions are concordant.

Methods

A cohort of 30 subjects (4 males and 26 females) between 41 and 91 years of age were included. Each patient had same-day repeat DXA scans of non-dominant forearm on a Hologic fan-beam scanner (Hologic Horizon A) in both supine and sitting positions. Positioning of patients was followed according to the manufacturer operator manual. A total of 3 technologists acquired the 60 scans. All acquisitions of each patient were analyzed by the same technologist. Forearm region of interest was defined as one-third radius according to ISCD recommendation. The forearm BMD measured in the two scanning positions was compared by independent-sample t-tests. Results were considered significant when p < 0.05. A Bland-Altman plot was also constructed to determine the agreement of measured forearm BMD between the two scanning positions.

Results

Mean forearm BMD measured in supine and sitting positions were 0.578g/cm2 and 0.572 g/cm2 respectively. There was no significant difference between forearm BMD measured in the two scanning positions (p = 0.852). The Bland-Altman plot (figure 1) also showed satisfactory agreement of measured BMD of non-dominant forearm between supine and sitting scanning positions.

Conclusions

Non-dominant forearm BMD measured in supine and sitting positions are concordant.



中文翻译:

仰卧位和坐位非优势前臂骨密度测量的一致性

介绍

根据 ISCD 立场声明,所有患者均应在脊柱和髋部测量骨矿物质密度 (BMD)。在某些情况下,还应测量非优势前臂的 BMD,例如无法测量髋关节和/或脊柱的患者、甲状旁腺功能亢进症患者或非常肥胖的患者。前臂可以仰卧位和坐位扫描。但前臂在不同位置扫描时测得的BMD可能存在显着差异,从而影响诊断和管理。

目标

本研究的目的是评估在仰卧位和坐位扫描之间测量的非优势前臂 BMD 是否一致。

方法

纳入了 41 至 91 岁的 30 名受试者(4 名男性和 26 名女性)。每位患者在仰卧位和坐位均在 Hologic 扇形束扫描仪 (Hologic Horizo​​n A) 上对非优势前臂进行了同一天的重复 DXA 扫描。根据制造商操作手册对患者进行定位。共有 3 名技术人员获得了 60 次扫描。每位患者的所有采集均由同一技术人员分析。根据 ISCD 的推荐,前臂感兴趣区域定义为半径的三分之一。通过独立样本 t 检验比较在两个扫描位置测量的前臂 BMD。当 p < 0.05 时,结果被认为是显着的。还构建了一个 Bland-Altman 图以确定两个扫描位置之间测量的前臂 BMD 的一致性。

结果

在仰卧位和坐位测量的平均前臂骨密度分别为 0.578g/cm2 和 0.572g/cm2。在两个扫描位置测量的前臂 BMD 之间没有显着差异 (p = 0.852)。Bland-Altman 图(图 1)也显示了仰卧位和坐位扫描位置之间非优势前臂测量的 BMD 的令人满意的一致性。

结论

在仰卧位和坐位测量的非优势前臂 BMD 是一致的。

更新日期:2022-04-18
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