What causes the stiffness and discomfort after arthroscopic knee surgery is done for repairing a torn meniscus?

Normal sequellae: I do not do this procedure, but I do many laparoscopic procedures. I would expect that the normal sequellea to the trauma of the arthroscopy would include some swelling and edema as well as some degree of inflammation. These changes would certainly cause some pain and stiffness, but should be fairly limited and transient.

Dr Villaplana and another doctor agreed

Trauma: To muscles, tendons, joint, meniscus and bony surfaces! the tissues are stretched, cauterized, and bruised.