Hi, Is it possible to determine the most likely cause of a knee effusion of unknown cause based solely on its response to physiotherapy ? If the two possibilities are: 1. A torn meniscus due to twisting the knee playing sport 2. Psoriatic Arthritis If the effusion decreases with physiotherapy/rest/icing does this make it more likely that a torn meniscus is the cause or can effusion due to PA also be effectively treated by rest/icing/physiotherapy ? Thanks,
