A radiculopathy is caused by compression of a nerve root as it exits the spinal column, which causes pain/numb
ness/tingling in the distribution of the nerve affected and
eventually weakness/atrophy if long stand
ing or severe. The mostly sensory symptoms
that you have in your arm
is consitent with a C5/C6 lesion (the index finger is supplied by the radial nerve with nerve roots in the C5/C6 roots), and
the purely sensory sensation in your foot
is also consistent with L5/S1 radiculopathy.