This is Dr. David
I am sorry you are having aches in your arms and pins and needles in your hands.
this could be due to a pinched nerve or carpel tunnel syndrome.
why are you convinced that it is not mechanical?
have you had a wrist MRI scan to check for carpel tunnel syndrome?
working at a computer all day puts you at risks for carpel tunnel syndrome.
blood work does not really rule out carpel tunnel syndrome.
you need an ultrasound of your wrist to check for pinched nerves in the wrist.
you could also have a pinched nerve in your spine or neck from your osteoarthritis causing pain in your arms.
you do need further investigation.
you are welcome
I hope you get some headway towards diagnosis.
keep pressing for imaging scan of your spine and your wrist.
best of luck to you
let me know if you have other questions.
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you can always reach me as Dr. David if you have other questions.