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<v ->I'm gonna prove the point that fat is your friend

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by talking about subperiosteal extrusion of fat.

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If you can find that even when subtle

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it tells you that there is disruption of the cortical bone.

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And where are you gonna find that most typically?

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You're gonna find it in an immature skeleton, a child,

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involving the distal radius with a buckling fracture

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typically with buckling of the dorsal surface

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of the distal radius.

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And what occurs

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with that fracture is release of marrow fat.

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You can see these small bubbles here,

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that marrow fat will cause elevation

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of the periosteal membrane but will not disrupt it.

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So it collects within this space.

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Now that becomes important later on

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because the fact that it collects within that space

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do not be surprised if later on

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you see that fat now within the cortex

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because the elevated periosteal membrane has laid down bone,

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the fat is caught within the new bone

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and you'll see these radiolucent areas

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that look like, well, like an osteoid osteoma

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maybe two of them.

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I've seen seven of them in fact in one case

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this is simply the fat that is now caught within the bone.

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Tenosynovial extrusion of fat is a good sign

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that there's a nearby fracture.

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I showed you a case earlier on, here's another one.

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Not the prettiest of images,

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but it was a fracture of the distal radius with fat

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that had now been released

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within the extensor tendencies.