Bone Abstracts

Background: Dual-energy X-ray absorptiometry (DXA) remains the reference standard for assessing bone mineral density (BMD) and diagnosing osteoporosis. However, several emerging technologies have been developed aiming to improve access, support triage techniques, facilitate bone measurement in difficult to scan populations and improve case finding. This overview examines selected bone measurement approaches, including Radiofrequency Echographic Multi Spectrometry (EchoLight), pulse-echo ultrasonography (Bindex®), Quantitative Computed Tomography and IBEX bone health.

Methods: An overview of published literature was undertaken to evaluate the principles, clinical utility, advantages, and limitations of four non-DXA osteoporosis assessment methods. Evidence relating to diagnostic performance, fracture risk prediction, accessibility, and potential integration into osteoporosis pathways was reviewed and synthesised.

Results: EchoLight is a radiation-free ultrasound-based technology that analyses raw radiofrequency signals from lumbar spine and femoral sites to estimate BMD and classify osteoporosis. Studies demonstrate, on average, good agreement with DXA. Bindex® employs pulse-echo ultrasonography at the proximal tibia and distal radius with current evidence suggesting a triage technique to identify individuals at low risk of osteoporosis and reduce unnecessary DXA referrals. Evidence suggests acceptable sensitivity and specificity when incorporated into diagnostic pathways. Quantitative Computed Tomography (QCT) provides three-dimensional volumetric assessment of bone, enabling separate evaluation of trabecular and cortical compartments and demonstrating good diagnostic accuracy for osteoporosis, particularly in individuals with degenerative spinal changes or other factors that may affect DXA measurements. IBEX Bone Health utilises opportunistic analysis of routinely acquired x-rays at the wrist to assess bone density without additional imaging, radiation exposure, or patient appointments. Early evidence suggests that IBEX can support osteoporosis case finding.

Conclusion: Several non-DXA techniques offer valuable complementary information for osteoporosis assessment. EchoLight and Bindex® provide portable, radiation-free alternatives that may enhance case-finding and improve access to bone health evaluation. QCT and IBEX offer opportunistic assessment of fracture risk from routine imaging, making them a useful addition for patients in at risk groups. The evidence base for the inclusion of non-DXA techniques is still evolving but these techniques may support identification of individuals at risk of fragility fractures and facilitate improved case finding strategies in the future.