If it is just to the last 2 digits of your hand, it may mean the Ulnar nerve
which supplies this region is compromised somewhere. It can be anywhere from the neck to the wrist and often at the elbow (your so-called 'funny bone' is the ulnar nerve). It is best to get a Nerve Conduction Study
to find out where the impairment may be.
As it is a few years from the original injury
, it may not be necessarily related as you can develop such symptoms without any injury.