If this is a dull type of pain it is a cause of strain in the extensor muscles of hand and fore arm. If this is a sharp pain
and at the joint only then it is a cause of extensor tendinopathy
.. Since this pain lasts a year back conservative management like following would be helpful -
Cryopack over the painful point
followed by deep transverse friction massage
followed by hydro collateral pack
followed by myofascial release
followed by high voltage galvanic stimulation/ surged faradism under tension
followed by free exercises and inter ferential therapy if required
followed by pulsed ultrasound therapy
followed by kinesio taping technique
weekly 2-3 sessions of physiotherapy
for about 4 weeks including rehabilitation protocol
must take physiotherapy from a cerified / registered physiotherapist if possible from a physio having specialisation in musculoskeletal conditions.....
wish you a pain free hand soon.....