Echogenic area in posterior GH joint

[Stephen Bird]

Hi Mike, I have loaded this up for you.

You ask:

What are the hyperechoic posterior glenohumeral signals?

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[Stephen Bird]

Hi Mike,

I have attached a labelled image,

The echoes are the bony glenwood, the labrum and then a tiny bit of gas (nitrogen) which comes out of solution from the synovial fluid.
You see this commonly,
The differential would be some crystal deposition like CPPD or gout, however this is much less likely.

Steve

[Stephen Bird]

Here is the image,

Steve

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[Michael Shilton]

That’s great to know, thanks. Presumably the gas is transient and is unlikely to be there on a rescan? Mike.

[Stephen Bird]

Hi Mike,

Yes, gas will move around and not be a constant feature. It is usually a feature of a healthy joint with an intact capsule capable of generating a tight seal and hence negative pressure when moved dynamically.
I see this gas as a sign of joint health rather than disease.

Steve

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