Sorry, new here, hope you don't mind.
Seems your cham is OK,

, but you seemed concerned about gout.
Due to the wonders of genetics, I and my sisters all suffer from gout.
I also knew a guy who had a dog with a rare case of gout.
Due to what I do, I can offer a small bit of insight if you're interested...
Inflammation in a single limb is usually a form of response to trauma or an osteo based arthritis, gout is rare (very rare in animals).
Gout is caused by a buildup of uric acids.
Uric acid buildup is caused by the inability to break down certain proteins in the blood (lack of urease or argonase enzymes), or by a kidney problem where you cant pass the uric acid out in urine form.
So uric acid builds up, crystallizes, and forms, effectively, little 'razor blades' in joints that slice the heck out of anything with the slightest movement.
The precursor of uric acid is purines in food.
Most edible insects, including roaches, crickets, silkworms, etc are very high in purines*.
But, most insect eating animals have adaptions to enzymes to break down higher than normal purine diets, but apparently some do not, and its rare.
In any animal gout is an excruciating, excruciating condition.
My gout dog buddy said during attacks his dog would just curl up and whine, unable to move, snapping at anyone that came near, I'm like that too.
I'd believe that if your cham had gout, it would not only not be mobile, but would have gone Kaiser Sosay on you had you tried to move its leg.
The only way to truly ID gout is to have a blood draw during an attack to confirm high uric acid levels.
Hope thats helpful for future concerns.
*
https://www.researchgate.net/public...s_of_common_edible_insects_in_Southwest_China