Trabecular Bone Score (TBS)—A Novel Method to Evaluate Bone Microarchitectural Texture in Patients With Primary Hyperparathyroidism

• Published in: The journal of clinical endocrinology and metabolism Vol. 98; no. 5; pp. 1963 - 1970
• Main Authors: Silva, Barbara Campolina, Boutroy, Stephanie, Zhang, Chiyuan, McMahon, Donald Jay, Zhou, Bin, Wang, Ji, Udesky, Julia, Cremers, Serge, Sarquis, Marta, Guo, Xiang-Dong Edward, Hans, Didier, Bilezikian, John Paul
• Format: Journal Article
• Language: English
• Published: Bethesda, MD Endocrine Society 01-05-2013; Copyright by The Endocrine Society
• Subjects: Absorptiometry, Photon; Academic Medical Centers; Aged; Biological and medical sciences; Bone and Bones - chemistry; Bone and Bones - diagnostic imaging; Bone and Bones - pathology; Bone Density; Bone Diseases, Metabolic - epidemiology; Bone Diseases, Metabolic - etiology; Bone Diseases, Metabolic - pathology; Bone Diseases, Metabolic - physiopathology; Bone Resorption - diagnostic imaging; Bone Resorption - etiology; Chemical Phenomena; Cross-Sectional Studies; Endocrine Care; Endocrinopathies; Feeding. Feeding behavior; Female; Fundamental and applied biological sciences. Psychology; Humans; Hyperparathyroidism, Primary - complications; Hyperparathyroidism, Primary - pathology; Hyperparathyroidism, Primary - physiopathology; Imaging, Three-Dimensional; Medical sciences; New York City - epidemiology; Non tumoral diseases. Target tissue resistance. Benign neoplasms; Osteoporosis, Postmenopausal - complications; Osteoporosis, Postmenopausal - epidemiology; Osteoporosis, Postmenopausal - pathology; Osteoporosis, Postmenopausal - physiopathology; Osteoporotic Fractures - epidemiology; Osteoporotic Fractures - etiology; Parathyroids. Parafollicular cells. Cholecalciferol. Phosphocalcic homeostasis (diseases); Prevalence; Risk; Severity of Illness Index; Tomography, X-Ray Computed; Vertebrates: anatomy and physiology, studies on body, several organs or systems; Vertebrates: endocrinology; Endocrinopathy; Human; Evaluation; Obesity; Methodology; Nutrition; Nutrition disorder; Patient; Metabolic diseases; Parathyroid diseases; Primary; Trabecular bone; Spongious bone; Endocrinology; Nutritional status; Hyperparathyroidism
• ISSN: 0021-972X; 1945-7197
• DOI: 10.1210/jc.2012-4255

Context:
In the milder form of primary hyperparathyroidism (PHPT), cancellous bone, represented by areal bone mineral density at the lumbar spine by dual-energy x-ray absorptiometry (DXA), is preserved. This finding is in contrast to high-resolution peripheral quantitative computed tomography (HRpQCT) results of abnormal trabecular microstructure and epidemiological evidence for increased overall fracture risk in PHPT. Because DXA does not directly measure trabecular bone and HRpQCT is not widely available, we used trabecular bone score (TBS), a novel gray-level textural analysis applied to spine DXA images, to estimate indirectly trabecular microarchitecture.
Objective:
The purpose of this study was to assess TBS from spine DXA images in relation to HRpQCT indices and bone stiffness in radius and tibia in PHPT.
Design and Setting:
This was a cross-sectional study conducted in a referral center.
Patients:
Participants were 22 postmenopausal women with PHPT.
Main Outcome Measures:
Outcomes measured were areal bone mineral density by DXA, TBS indices derived from DXA images, HRpQCT standard measures, and bone stiffness assessed by finite element analysis at distal radius and tibia.
Results:
TBS in PHPT was low at 1.24, representing abnormal trabecular microstructure (normal ≥1.35). TBS was correlated with whole bone stiffness and all HRpQCT indices, except for trabecular thickness and trabecular stiffness at the radius. At the tibia, correlations were observed between TBS and volumetric densities, cortical thickness, trabecular bone volume, and whole bone stiffness. TBS correlated with all indices of trabecular microarchitecture, except trabecular thickness, after adjustment for body weight.
Conclusion:
TBS, a measurement technology readily available by DXA, shows promise in the clinical assessment of trabecular microstructure in PHPT.