Interesting case: a professional drummer come with right hand chronic pain due to playing too much drum. Lots of Ashi point around the right wrist, and two points left ankle about the locations of ki6 and bl62. The tender pain on the ankle became much less after I put needles around the wrist!
When I add electricity to the right wrist, the patient said he.could feel Deqi on the left ankle! 
Cross channel Ashi points are simple but good idea to treat this kind of sprain pain.