In a study on knees of asymptomatic people, 44 people who had no history of knee pain, injury, or bone or joint disease were recruited and their knees were imaged. 43 of the 44 had at least one abnormality in the meniscus tissue. Also of note from that study was that of the 44 studied, 27 had abnormalities in at least three of the four regions of the knee.
