In reply to James Coulson:
I thought I'd pulled a tendon in my finger yesterday, but am now of the opinion that it's actually the tendon in the forearm pulling everything else tight and causing the pain in my middle finger, and numbness in the finger next to it. Deep tissue massage on the forearm seems to alleviate the pain and locking of the middle finger, if only temporarily...
I don't know your symptoms, but thought it might be something to bear in mind.
Post edited at 13:45