Is dual-energy absorptiometry accurate in the assessment of bone status of patients with chronic kidney disease?

• Published in: Osteoporosis international Vol. 32; no. 9; pp. 1859 - 1868
• Main Authors: Kim, K., Song, S.H., Kim, I.-J., Jeon, Y.K.
• Format: Journal Article
• Language: English
• Published: London Springer London 01.09.2021; Springer Nature B.V
• Subjects: Absorptiometry, Photon; Aorta; Bone Density; Bone mineral density; Calcification (ectopic); Cancellous bone; Cancellous Bone - diagnostic imaging; Computed tomography; Dialysis; Discordance; Dual energy X-ray absorptiometry; Endocrinology; Femur; Humans; Kidney diseases; Medicine; Medicine & Public Health; Original Article; Orthopedics; Osteopenia; Osteoporosis; Renal Insufficiency, Chronic - complications; Retrospective Studies; Rheumatology; Spine (lumbar); Dual-energy absorptiometry; Bone mineral density; Chronic kidney disease; Aortic calcification; Quantitative computed tomography; Trabecular bone score
• ISSN: 0937-941X; 1433-2965
• DOI: 10.1007/s00198-020-05670-z

Summary Several patients with chronic kidney disease (CKD) have deteriorated bone status. Estimation of bone status using DXA has limitations especially in patients with CKD accompanying aortic calcifications. Quantitative CT and the trabecular bone score could be more accurate methods to estimate bone status for patients with CKD and vascular calcifications. Introduction It remains unclear whether dual-energy absorptiometry (DXA) is appropriate for the assessment of bone status in patients with chronic kidney disease (CKD), a disease that impacts bone health. The aims of this study were to compare DXA and central quantitative computed tomography (cQCT) and to evaluate bone status in patients with pre-dialysis CKD. Methods This retrospective study included 363 healthy control subjects whose bone mineral density (BMD) was evaluated with DXA and 117 CKD patients whose BMD was evaluated using both cQCT and DXA. Diagnostic discordance was assessed between the lumbar spine (LS) and femur neck (FN) from DXA or between two modalities. The trabecular bone score (TBS) was extracted from DXA images. The volume of abdominal aortic calcification (AAC) was calculated using CT images from cQCT. Results Using LS DXA T-score, osteoporosis was less common in the CKD group than in controls. Patients with normal LS BMD using DXA were reclassified into osteopenia or osteoporosis using cQCT in CKD patients. Among discordant subjects between FN and LS in DXA, a higher BMD of LS was more common in CKD patients than in controls. CKD patients had lower TBS than controls despite having the same diagnosis using DXA. AAC volume negatively correlated with BMD from cQCT and with TBS but not with BMD from DXA. Conclusions TBS and cQCT could accurately assess bone status in CKD patients since DXA may overestimate LS BMD, likely due to an increased AAC volume.