title: I recently received a cortisone injection in my knee, and it substantially reduced the pain and stiffness.  How often can I safely have these injections?  Will there be side effects?
mesh_terms: D000893:Anti-Inflammatory Agents / Q000008:administration & dosage* / Q000009:adverse effects; D018771:Arthralgia / Q000188:drug therapy*; D003348:Cortisone / Q000008:administration & dosage* / Q000009:adverse effects; D004334:Drug Administration Schedule; D006801:Humans; D007270:Injections, Intra-Articular; D007719:Knee Joint
chemical_list: D000893:Anti-Inflammatory Agents; D003348:Cortisone