LOCALIZATION OF KNEE-JOINT CARTILAGE PATHOLOGY BY MULTICHANNEL VIBROARTHROGRAPHY

This paper proposes non-invasive techniques to localize secund or vibr oarthrographic (VAG) signal sources in human knee joints. VAG signals from normal subjects, patients who subsequently underwent arthroscopy, and cadavers with arthroscopically-created lesions, obtained by stimu lation with a finger tap over the mid-patella and swinging movement of the leg, were analyzed for time delays using cross-correlation functi ons for source localization. Correct results were obtained for 13 of t he 14 subjects tested by finger stimulation, and for 11 of the 12 subj ects whose VAG signals during swinging movement were analyzed. The tec hniques could be valuable in the diagnosis and treatment of knee patho logy before and after joint surgery or drug therapy.