Regional variations of vertebral trabecular bone microstructure with age and gender

• Published in: Osteoporosis international Vol. 19; no. 10; pp. 1473 - 1483
• Main Authors: Chen, H., Shoumura, S., Emura, S., Bunai, Y.
• Format: Journal Article
• Language: English
• Published: London Springer-Verlag 01.10.2008; Springer; Springer Nature B.V
• Subjects: Aged; Aged, 80 and over; Aging; Aging - pathology; Biological and medical sciences; Diseases of the osteoarticular system; Endocrinology; Female; Gender; Humans; Lumbar Vertebrae - diagnostic imaging; Lumbar Vertebrae - ultrastructure; Male; Medical sciences; Medicine; Medicine & Public Health; Microscopy, Electron, Scanning; Middle Aged; Original Article; Orthopedics; Osteoporosis; Osteoporosis - diagnostic imaging; Osteoporosis - pathology; Osteoporosis. Osteomalacia. Paget disease; Rheumatology; Sex Factors; Spine; X-Ray Microtomography; Aging; Micro-CT; Vertebral body; Scanning electron microscopy; Regional variation; Microstructural properties; Osteoporosis; Radiodiagnosis; Bone age; Diseases of the osteoarticular system; Medical imagery; Vertebra; Bone trabeculae; Aging . Micro-CT . Microstructural properties . Regional variation . Scanning electron microscopy; Computerized axial tomography; Microstructure
• DOI: 10.1007/s00198-008-0593-3
• ISSN: 0937-941X; 1433-2965

Summary The vertebral trabecular bone has a complex three-dimensional (3D) microstructure, with inhomogeneous morphology. A thorough understanding of regional variations in the microstructural properties is crucial for evaluating age- and gender-related bone loss of the vertebra, and may help us to gain more insight into the mechanism of the occurrence of vertebral osteoporosis and the related fracture risks. Introduction The aim of this study was to identify regional differences in 3D microstructure of vertebral trabecular bone with age and gender, using micro-computed tomography (micro-CT) and scanning electron microscopy (SEM). Methods We used 56 fourth lumbar vertebral bodies from 28 women and men (57–98 years of age) cadaver donors. The subjects were chosen to give an even age and gender distribution. Both women and men were divided into three age groups, 62-, 77- and 92-year-old groups. Five cubic specimens were prepared from anterosuperior, anteroinferior, central, posterosuperior and posteroinferior regions at sagittal section. Bone specimens were examined by using micro-CT and SEM. Results Reduced bone volume (BV/TV), trabecular number (Tb.N) and connectivity density (Conn.D), and increased structure model index (SMI) were found between ages 62 and 77 years, and between ages 77 and 92 years. As compared with women, men had higher Tb.N in the 77-year-old group and higher Conn.D in the 62- and 77-year-old groups. The central and anterosuperior regions had lower BV/TV and Conn.D than their corresponding posteroinferior region. Increased resorbing surfaces, perforated or disconnected trabeculae and microcallus formations were found with age. Conclusion Vertebral trabeculae are microstructurally heterogeneous. Decreases in BV/TV and Conn.D with age are similar in women and men. Significant differences between women and men are observed at some microstructural parameters. Age-related vertebral trabecular bone loss may be caused by increased activity of resorption. These findings illustrate potential mechanisms underlying vertebral fractures.