OPTICAL MEASUREMENTS OF PHYSIOLOGICAL PATELLOFEMORAL CREPITUS

LA NEELY, George Kernohan, DA BARR, CHB MEE, RAB MOLLAN

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

An optical method to measure directly small displacements of the patella has been developed. Light from a helium-neon laser was reflected from a plane mirror taped to the skin over the patella to a glass plate which generated a set of fringes by interference of light reflected from the front and rear surfaces of the plate. The movement of the fringe system was detected using a photodiode. The optical measurements of displacement were compared with those deduced from an accelerometer attached to the same joint. The method was found to be capable of detecting patellar displacements in the range from 20-mu-m to 180-mu-m.
Original languageEnglish
Pages (from-to)219-226
JournalClinical Physics and Physiological Measurement
Volume12
Issue number3
Publication statusPublished - Aug 1991

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