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Bone scan
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A bone scan is a nuclear medicine study: instead of sending rays through the body from outside, a substance that gives off radiation from inside is introduced and a camera detects it. That substance is called a radiotracer, and here it is usually technetium-99m bound to a diphosphonate.
The diphosphonate is the part that knows where to stick. It binds by chemisorption, a chemical bond, to crystalline hydroxyapatite, the mineral that bone is made of.
What matters is how much of it stays at each spot. The tracer builds up in proportion to osteoblastic activity, that is, to how active the bone-building cells are there. Bone that is working harder holds on to more tracer, and that is what lights up. That is why the study picks up a great many processes, but on its own it does not say which one is present.
In brief
A bone scan is a nuclear medicine study, usually done with technetium-99m bound to a diphosphonate.
That diphosphonate binds by chemisorption to the crystalline hydroxyapatite of the mineral phase of bone.
The tracer builds up in proportion to osteoblastic activity, so any process that raises it shows up as increased uptake.
Bone that is working harder holds on to more tracer, and that is what lights up.
Sources (1)
- National Center for Biotechnology Information, StatPearls PublishingBone Scan, StatPearlsPublished
This page explains the topic in general terms; it does not tell anyone what treatment to follow.
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