In more severe chronic exposure, bone calcium is gradually replaced by fluorine; the bones become soft and crumbly and turn chalky white.
Apart from blood, bone surface area, saliva, milk is also contemporary biomarkers; and whereas nails and hair are biomarkers of recent exposure, bone and teeth are the biomarkers for historical exposure (WHO 2014).
Consequently, more extensive surgical exposure, bone debris, and longer operative time in hip resurfacing are not likely to be absolute risk factors for heterotopic ossification.
Nevertheless, if the mechanism(s) by which lead affects maternal blood pressure levels is heavily influenced by long-term lead exposure, bone lead could be a better biomarker for describing a relationship of lead exposure with blood pressure.
It is unclear to what extent a decline in platelet counts during a course of TPE is related to heparin exposure, bone marrow suppression secondary to therapeutic immunosuppression, platelet consumption or possibly heparin-induced thrombocytopenia.
We discuss and present supporting evidence for a conceptual model that distinguishes two major paradigms of skeletal lead, including 1) bone lead as an indicator of cumulative lead exposure (bone lead as repository), and 2) bone lead as a source of body lead burden that is mobilizable into the circulation (bone lead as source).
Our data suggest that in addition to current sources of environmental lead exposure, bone lead accumulated over time constitutes a moderate source of circulating lead during adolescence and may account for some of the adverse health effects documented in recent studies.
Hernandez-Avila et al. (1998) reported that, in individuals with no history to occupational Pb exposure, bone-Pb (in particular trabecular Pb) exerts an additional independent influence on plasma-Pb after control for BPb.
As pointed by Hu et al. (1998), two major paradigms relate to skeletal Pb: bone-Pb as an indicator of cumulative Pb exposure (bone-Pb as a repository), and bone-Pb as a source of body burden that can mobilized into the circulation (bone-Pb as a source).
Patella and tibia lead are biomarkers of cumulative lead exposure and body burden, while blood lead is a biomarker of recent exposure including endogenous exposure from bone [ 60].
