Exercise & PreventionAlt-therapiesBones & JointsExerciseMedicationsPain ManagementPrevention Ask The Doctors: April 2018 estaff Published: March 7, 2018 0 Print Email Facebook Twitter How can I strengthen my core muscles? Any machines at the gym I should use? Ive had one cortisone shot in my arthritic knee. Its hurting again. How many of these can I safely get? To continue reading this article you must be a paid subscriber Subscribe Subscribe to Arthritis Advisor Get the next year of Arthritis Advisor for just $20. And access all of our online content - over 1,000 articles - free of charge. Subscribe today and save 36%. It's like getting 4 months FREE! Already Subscribed? Click Here to Sign In | Forgot your password?