Recently е plague 3 patients, from different hospitals, underwent off camera surgery in an external hospital, the postoperative pathology results showed consideration of synovitis of the knee, and the corresponding treatment was given, as a result, the knee repeatedly swollen, painful and sinus tracts (2 cases), the rest did not appear sinus tracts, because the early consultation did not appear, after admission to the hospital to give tuberculosis related examination, considered tuberculosis, 3 cases after review of the external pathology results confirmed the diagnosis of The rest were diagnosed by postoperative pathology and given anti-tuberculosis medication for two weeks before surgery, and the surgery was performed by incision because: 1) the synovial membrane of the lesion was thick and there was a large amount of cartilage destruction, which made microscopic excision difficult; 2) the cystic cavity of the suprapatellar bursa was combined. Another name of our hospital is Henan Province Tuberculosis Hospital, a large number of TB patients have accumulated a lot of experience for our department and pathology department, we would like to thank the patients who trust our hospital, because of the national policy, the treatment of TB is more concentrated, which leads to some hospitals are difficult to handle over TB patients.