Bi-Directional Axial Transmission measurements applied in a clinical environment

Area of Science:

• Biomedical Engineering
• Orthopedics
• Radiology

Background:

• Accurate cortical bone measurement is crucial for fracture risk assessment and treatment planning.
• Current gold standard, Dual X-ray Absorptiometry (DXA), has limitations.
• Quantitative Ultrasound (QUS) devices offer portability and sensitivity to bone properties.

Purpose of the Study:

• To evaluate the performance of a Bi-Directional Axial Transmission (BDAT) device in a clinical setting with older subjects.
• To assess BDAT's ability to measure cortical bone parameters and predict non-traumatic fractures.

Main Methods:

• A cross-sectional study involving 106 older patients (79 non-fractured, 27 with fractures).
• BDAT device measured velocities (VFAS, VA0) and derived cortical thickness (Ct.Th) and porosity (Ct.Po).
• DXA measured areal bone mineral density (aBMD); multivariate analyses (PLS-LOOCV) were used for prediction.

Main Results:

• BDAT parameters showed weak to moderate correlations with age and BMI.
• Combination of VFAS and Ct.Po/Ct.Th predicted all non-traumatic fractures (AUC=0.63).
• A model including VA0, Ct.Th, Ct.Po, Ct.Po/Ct.Th, and age predicted non-vertebral fractures (AUC=0.75).

Conclusions:

• BDAT demonstrated comparable or superior fracture prediction performance to DXA in a subset of patients.
• The BDAT method is a potentially valuable, affordable, and transportable tool for routine fracture risk assessment in older adults.
• Clinical implementation of BDAT could enhance fracture risk stratification and guide treatment strategies.