A comparative study between corresponding structural geometric variables using 2 commonly implemented hip structural...

Area of Science:

• Orthopedics and Bone Health
• Medical Imaging Analysis
• Biomechanical Engineering

Background:

• Hip structural analysis (HSA) has been utilized for two decades in research to link bone geometry with fragility.
• Hologic Inc. introduced a modified version, clinical HSA (c-HSA), in 2007 for their DXA scanners, transitioning HSA into clinical practice.

Purpose of the Study:

• To compare the outcomes of research-HSA (r-HSA) and clinical-HSA (c-HSA) implementations.
• To assess the agreement and identify discrepancies in bone structural geometric measurements between the two HSA versions.

Main Methods:

• Dual-energy X-ray absorptiometry (DXA) scans from 191 females were analyzed using both r-HSA and c-HSA.
• Bland-Altman plots were employed to evaluate the agreement between measurements from the narrow-neck (NN) region of the hip.

Main Results:

• Significant differences (p < 0.001) were observed in NN areal bone mineral density, cross-sectional area, moment of inertia, and section modulus between r-HSA and c-HSA.
• r-HSA generally yielded higher values for these parameters compared to c-HSA, except for NN subperiosteal width.
• High linear correlations (r(2) > 0.81) were found for most NN structural geometric outcomes, though neck shaft angle showed weaker correlation (r(2) > 0.47).

Conclusions:

• While significant differences exist between r-HSA and c-HSA bone geometry measurements, strong correlations suggest comparability.
• The study provides essential linear transformation parameters to convert r-HSA data to c-HSA equivalents, facilitating data integration and clinical application.