DXA-Based Bone Strain Index: A New Tool to Evaluate Bone Quality in Primary Hyperparathyroidism.

Area of Science:

• Orthopedics and Bone Metabolism
• Medical Imaging and Diagnostics
• Endocrinology

Background:

• Primary hyperparathyroidism (PHPT) is linked to poor bone quality and elevated fracture risk.
• Current clinical tools for assessing bone quality are limited.
• The Bone Strain Index (BSI) is a novel metric derived from Finite Element Analysis of DXA scans, offering a new way to evaluate bone strength.

Purpose of the Study:

• To compare lumbar spine (LS), femoral neck (FN), and total hip (TH) BSI values in PHPT patients versus controls.
• To examine the relationship between BSI and vertebral fractures (VFs) in individuals with PHPT.

Main Methods:

• A case-control study involving 50 PHPT patients and 100 matched controls.
• Measurement of LS-BSI, FN-BSI, and TH-BSI as primary outcomes.
• Analysis of dual-energy x-ray absorptiometry (DXA) images using Finite Element Analysis.

Main Results:

• PHPT patients exhibited significantly lower bone mineral density at the FN and radius, and reduced TBS scores compared to controls.
• BSI values were significantly higher in PHPT patients across LS, FN, and TH.
• LS-BSI demonstrated moderate accuracy in predicting VFs and was an independent predictor of VFs.

Conclusions:

• The DXA-derived Bone Strain Index (BSI) is impaired in PHPT.
• BSI may serve as a valuable tool for identifying PHPT patients at increased risk of fractures.