Does Radiofrequency Echographic Multi-Spectrometry (REMS) perform similarly to Dual-energy X-ray Absorptiometry (DXA)...

To evaluate whether bone assessment by radiofrequency echographic multi-spectrometry (REMS) is influenced by trabecular bone integrity by comparing it to dual-energy X-ray absorptiometry (DXA) and the trabecular bone score (TBS). Additionally, the study aims to determine if comparing fracture risk using FRAX and the National Osteoporosis Guideline Group (NOGG) using the T-score from each method would lead to differences in a Brazilian female population.

A sample of women aged 30-80 underwent REMS and DXA scans of axial sites at the Hospital São Paulo, Brazil. Subsequently, TBS was applied to DXA exams. Clinical data were obtained from hospital records and phone interviews to calculate fracture risk.

Among the 343 participants enrolled, 213 had comparable lumbar spine exams by REMS, DXA, and TBS, and 166 had comparable hip exams by REMS and DXA. The correlation between lumbar spine bone mineral density (BMD) by REMS and the TBS was low (r = 0.27, p < 0.001), as was the correlation between DXA and TBS (r = 0.39, p < 0.001). No statistically significant difference was found between the TBS classifications of osteoporotic lumbar spine by REMS and DXA (p = 0.178). Fracture risk data by FRAX were obtained from 119 participants, with 92% receiving concordant NOGG classifications for major osteoporotic fracture risk from REMS and DXA (κ = 0.71 CI95% (0.54 to 0.89), p < 0.001), and 87% for hip fracture risk (κ = 0.58 CI95% (0.38 to 0.77), p < 0.001).

REMS performed similarly to DXA in assessing trabecular integrity using TBS. Additionally, no statistically significant difference was observed in fracture risk assessment by FRAX based on NOGG recommendations.