Re. "Effect of Low Skeletal Muscle Mass on Post-operative Survival of Patients With Abdominal Aortic Aneurysm: A Prognostic Factor Review and Meta-Analysis of Time to Event Data"

Validation of two-dimensional vertebral body parameters in estimating patient height in elderly patients

OBJECTIVES

Standardised comparison of abdominal muscle and adipose tissue is often utilised in morphometric clinical research. Whilst measurements are traditionally standardised against the patient's height, this may not be always practically feasible. The aim of this study was to investigate the relationship between measurements of the vertebral body and patient height.

METHODS

We analysed cross-sectional CT scans. Measurements of the vertebral body area (VBA), anteroposterior vertebral body diameter (APVBD) and lateral vertebral body diameter (LVBD) were made by two independent investigators by manual tracing. Patients were randomly divided into two groups: Group 1 standardisation and Group 2 validation. We compared height and vertebral body parameters from patients in Group 1 and mathematically modelled this relationship. We then utilised the model to predict the height of patients in Group 2 and compared this with their actual height. Observer variability was assessed using Bland-Altman plots and t-tests of differences.

RESULTS

CT scans from 382 patients were analysed. No significant intraobserver or interobserver differences were apparent when measuring vertebral body parameters. We describe models which enable the prediction of the patients' height using the measured VBA, APVBD and LVBD. No significant differences were observed between the patients predicted and actual heights in the validation group.

CONCLUSIONS

We demonstrate an important relationship between measurements of the patient's height and the vertebral body. This can be utilised in future research when the patient's height has not been measured.

ADVANCES IN KNOWLEDGE

In the absence of the patient's height, we demonstrate that two-dimensional vertebral body parameters may be reliably used to standardise morphometric measurements.