Great care needs to be exercised especially around bony areas such when the ankle or knee.
Electrical devices range from around $30 to $60. Also could be costly depending upon the size of this area to treated. https://fwcl3tjvxyn7rutnbpopw5Vqyn5hga2gtzmdjvte5352su42Krta.cdn.ampproject.org/c/Arkmusic.co.kr%2Fbbs%2Fboard.php%3Fbo_table%3Dfree%26wr_id%3D1225715