Arthroscopy was employed on 531 cases, that is, 70 cases of rheumatiod arthritis, 17 cases of tuberculous arthritis, 5 cases of tumor, 11 cases of septic arthritis, 10 cases of syphilitic arthritis, and other 18 cases among arthritis, and 232 cases of the lesion of meniscus, 22 cases of the lesion of synovial wrinkles, 17 cases of joint mice, 31 cases of the fractures and the injury of ligaments and 17 cases other among the internal derangement of the knee points.
According as cases, the progress was followed up and the following results were obtained.
1) The resistance of the joint capsule at the puncture was depended on the age and the scar and contructure caused by inflammation.
2) The change of the synovial villus consisted of hyperemia, proliferation, hypergenesis, degeneration, atrophy and necrosis. The degeneration and necrosis were found on typical rheumatoid arthritis, the proliferation and the hypergenesis on typical osteoarthritis and the pigmentation on typical pigmented villondular synovitis.
3) The articular cartilage in the juvenility was pink-white, but it turned yellowish, turbid, sof tend and destroyed in the advanced age.
4) The arthroscopy was the best method for diagnosis of meniscal disorder. The torn meniscus appeared that its fiber was irregular, and at late its surface was slived and covered with synovialis etc. The postoperated and regenerated meniscus was found too.
5) The snapping phenomenon hardly reappeared in the knee in which the injecting sterile normal saline was inserted for arthroscopy. However, the conjuctive surface of the joint cartilage and meniscus was dynamically observed by the arthroscope and etiology could be cleared.
6) The lesion of the synovial wrinkle that could not be diagnosed by x-ray could be found by arthroscopy.
The progress of the knee joint disease could be almost physiologically observed and the therpeutic indications could be definitely decided, when the arthroscopy was performed with paying attention to the above metioned points.
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