How can i tell if i have a torn meniscus?

Pain/ swelling: A torn meniscus in someone your age is typically related to an injury. A twisting injury or deep bending of the knee while bearing heavy weight (squats/lunges) are usual mechanisms. Pain along the joint line associated with joint swelling is expected. Swelling may be mild/ moderate. Loss of full extension or pain with full flexion or extension and catching/ locking sensation highly suggestive.

Meniscal tears: There are several types of meniscal tears (see pic). Some meniscal tears occur w/ acute injury & some as degenerative changes (over time). Common symptoms include pain, swelling, clicking/ popping, locking/ catching, giving way, and/ or limited range of motion. Hope this helps. You may wish to try thessaly test, but it is best if you let a physician examine you and possibly order an MRI to be sure.