clinical note this gentleman had right knee pain for 8 months.it was more serious when going dowm stairs or squating.he had a traffic accident 3 years ago. I checked his right knee joint.there was neither obvious swelling nor red.Mc'murry test was positive.drawer test was negative. he had MRI scan two weeks ago.in the picture I could see the inner meniscus had a vertical crack in posterior horn. I thought a arthroscope surgery was necessary.