Healing trabecular microfractures in the bodies of lumbar vertebrae.
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Thepresence ofnodular aggregates ofwovenbone situated onporotic trabeculae hasbeendescribed in thepatella inchondromalacia patellae (Darracott andVernon-Roberts, 1971) andinthefemoral headin osteoarthrosis andrheumatoid arthritis (Todd, Freeman,andPirie, 1972). Thedistribution andmicrostructure ofthenodular aggregates indicate that they mayrepresent someformofnewboneformation or buttressing effect atsites oftrabecular stress (Darracott andVernon-Roberts, 1971)orcallus formation surrounding thesites oftrabecular fractures (Toddandothers, 1972). Thepresence offractures through trabeculae withsurrounding callus formed ofwovenbonehasalsobeendescribed in idiopathic aseptic necrosis ofthefemoral head(Lagier, 1971). Themicrostructure anddistribution ofthese trabecular lesions inthepatella andfemoral headhas stimulated ustosearch forsimilar lesions inthebodies oflumbar vertebrae, since diffuse orfocal osteoporosis isacommonfinding inthis region after the fifth decade, andsince itisalso clear that this region oftheskeleton isconstantly subjected tosevere mechanical stresses throughout life. Thepossibility thatsuchlesions could beconcerned inthegenesis ofbackpainwasalsoconsidered whenwestarted this study.
[1] J. Chalmers. Idiopathic Ischemic Necrosis of the Femoral Head in Adults , 1972 .
[2] B. Vernon‐roberts,et al. The bony changes in "chondromalacia patellae". , 1971, Rheumatology and physical medicine.
[3] M A Freeman,et al. Isolated trabecular fatigue fractures in the femoral head. , 1972, The Journal of bone and joint surgery. British volume.