In some instances, your physician may well recommend injecting medications or other substances immediately into your joint. Illustrations include: Pseudogout is often mistaken for gout but it's because of calcium-containing crystals that build within the joint fluid. Knees are the commonest joint impacted by pseudogout. It's got similar inflammatory signs https://www.theorthopaedicandpainpractice.com/what-is-knee-arthritis/