Continuous passive motion in computer assisted auscultation of the knee.
A study of physiological patellofemoral crepitus (PPC) signal recorded from adolescent knees has yielded information which suggests that decay time of PPC amplitude due to continuous passive motion (CPM) activity is a consistent and useful signature variable for a given knee. The PPC vibrational signal was induced in each case by 1 min of static load on the patella and postural variables during the examination were carefully controlled. The speed of CPM has been noted as a factor directly influencing the rat of PPC amplitude decay; specifically, a higher CPM speed contributes to an increased decay constant at a cost of increased inter-subject variability. It is proposed that CPM might form an important basis for the ultimate development of a computer-based auscultation technique for diagnosis of patellofemoral joint disorders.
Department of Orthopaedic Surgery, Queen's University of Belfast, Northern Ireland, UK.
D A
DA
Barr
L
L
Long
W G
WG
Kernohan
R A
RA
Mollan
D000054:Acceleration; D000293:Adolescent; D001314:Auscultation; D015331:Cohort Studies; D003936:Diagnosis, Computer-Assisted; D005269:Femur / Q000502:physiology; D006801:Humans; D007592:Joint Diseases / Q000175:diagnosis; D007719:Knee Joint / Q000502:physiology*; D015915:Motion Therapy, Continuous Passive / Q000295:instrumentation; D010329:Patella / Q000502:physiology; D005082:Physical Exertion / Q000502:physiology; D012044:Regression Analysis; D013016:Sound; D014732:Vibration