Knee pain at high altitudes

SpiraMirabilis

SpiraMirabilis

Possible Subversive
So the other day I had the opportunity/misfortune of having a long flight in the caravan (6hrs) and I ended up going to FL230 for fuel and wind purposes. Unpressurized, so I was wearing the O2 mask which is rather more uncomfortable than I anticipated.

However, cruising at at 23,000ft for a time my left knee started to hurt A LOT. I've never heard of this before, and this is the first time it has happened... it hurt enough that I couldn't even focus on the book..err flight manual I was trying to read.

When I descended down to 11,000ft it stopped hurting as badly and then went away all together. Have you heard of anything like this?

I wonder if there is some gas trapped in my kneecap that didn't like the change in pressures involved!! :eek:
 
Could always be from an old injury. Do you "crack" your knees or ankles like you crack your knuckles? If so, could be an old air bubble in there. I had one from a cyst that was removed in my neck a few years ago. It hurt above 10,000 for about a month, then went away.
 
My knees do occasionally make soft popping noises, well, I don't think anyone else could hear them so there not really noises per se, when I stand up.
 
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