Sinus Tarsi Injection Technique In this video, Dr. Kirby demonstrates a cortisone injection into the sinus tarsi of a patient with chronic sinus tarsi syndrome from a work-related inversion ankle sprain. The patient has chronic sinus tarsi pain and has benefitted in the past with previous cortisone injections, allowing her to continue to work in her weightbearing occupation. Most patients only need 1-2 of these injections total in their lifetime, to rid their foot of sinus tarsi pain, others, ra