Abstract
Introduction
Paget’s disease of bone (PDB) is the second most frequent metabolic bone disease with the spine being a common site of manifestation. Still, neither the disease’s etiology nor reasons for its manifestation at preferred skeletal sites are understood. The aim of the current study was therefore to perform a histologic and histomorphometric analysis of PBD biopsies of the spine to achieve a more detailed understanding concerning PDB activity and characteristics.
Materials and methods
Out of 754 cases with histologically proven PDB, 101 cases were identified to have involvement of the spine. A total of 29 individual vertebral body biopsies were available for histologic and histomorphometric analysis and were compared to age- and sex-matched spinal bone specimens obtained from skeletal-intact individuals at autopsy. Histomorphometric results were correlated with vertebral body height, disease location and iliac crest biopsies.
Results
In the majority of patients, PDB was located in the lumbar spine (62.2%). The cervical spine was affected in 8.2% of all cases with involvement of the second vertebral body (C2) in every other case. In comparison to age-matched individuals, histomorphometric analysis of vertebral body biopsies revealed a significant increase both in trabecular bone volume as well as osteoid parameters. In comparison to histomorphometric data obtained for extra-spinal skeletal locations affected by PDB (iliac crest), no differences in bone micro-architecture or disease activity were observed.
Conclusion
Disease activity in terms of osteoblast and osteoclast number does not appear to be significantly associated with disease location when spinal and iliac bone biopsies are compared. However, a positive correlation between vertebral body height and density in skeletal-intact individuals and disease incidence was observed leading to the conclusion that vertebral body height and possibly at least the spine bone volume together with bone density might play an important role in the incidence of PDB.
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J. M. Pestka and S. Seitz contributed equally to this study.
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Pestka, J.M., Seitz, S., Zustin, J. et al. Paget disease of the spine: an evaluation of 101 patients with a histomorphometric analysis of 29 cases. Eur Spine J 21, 999–1006 (2012). https://doi.org/10.1007/s00586-011-2133-7
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DOI: https://doi.org/10.1007/s00586-011-2133-7