Analysis of three-dimensional microarchitecture and degree of mineralization in bone metastases from prostate cancer using synchrotron microcomputed tomography

• Published in: Bone (New York, N.Y.) Vol. 35; no. 2; pp. 432 - 438
• Main Authors: Sone, Teruki, Tamada, Tsutomu, Jo, Yoshimasa, Miyoshi, Hidenao, Fukunaga, Masao
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.08.2004
• Subjects: Adult; Aged; Bone Density; Bone Neoplasms - diagnostic imaging; Bone Neoplasms - pathology; Bone Neoplasms - secondary; Calcification, Physiologic; Case-Control Studies; Degree of mineralization; Humans; Male; Middle Aged; Osteoblastic metastases; Osteosclerosis - diagnostic imaging; Osteosclerosis - pathology; Prostate cancer; Prostatic Neoplasms - pathology; Synchrotron radiation microtomography; Tomography, X-Ray Computed - methods; Trabecular microarchitecture; Synchrotron radiation microtomography; Trabecular microarchitecture; Prostate cancer; Osteoblastic metastases; Degree of mineralization
• ISSN: 8756-3282; 1873-2763
• DOI: 10.1016/j.bone.2004.05.011

Bone architecture and mineralization are generally considered to be important components of bone quality, and determine bone strength in conjunction with bone mineral density. Although the features of bone quality have recently been studied under conditions in which bone density decreases, such as osteoporosis, little is known in osteosclerotic diseases. In this study, we compared the trabecular bone microarchitecture and degree of mineralization between osteoblastic bone metastasis and degenerative osteosclerosis using synchrotron radiation microcomputed tomography (SR-μCT). Small cubes of lumbar vertebrae were excised postmortem from the sites of osteoblastic metastasis, degenerative osteosclerosis, and comparative sites of normal subjects without skeletal lesions. The samples were imaged at high spatial resolution (voxel size = 6 μm) using the SR-μCT system developed at the synchrotron facility (SPring-8), Hyogo, Japan. The three-dimensional (3D) image data were then analyzed for the morphological parameters and the degree of mineralization of bone (DMB). Trabecular bone in metastatic lesions showed a highly connected and isotropic network pattern compared with the normal samples. Although the trabecular surface was markedly irregular in osteoblastic metastases, no significant difference was found in the mean trabecular thickness (Tb.Th) between osteoblastic metastases and normal tissue. The DMB of trabeculae in metastatic lesions had a broader range and lower mean than that of the normal tissue. In contrast, trabecular bone in degenerative osteosclerotic lesions showed a similar degree of anisotropy (DA) and connectivity to the normal tissue, whereas the trabecular thickness was greater in the degenerative osteosclerotic lesions. No significant difference in DBM between degenerative osteosclerosis and normal tissue was detected. These results characterize the difference in bone quality between osteoblastic bone metastasis and degenerative osteosclerosis. Further study on the relationship between bone quality and bone strength in these osteosclerotic lesions would improve our understanding of the pathogenesis of bone fragility.