Detecting Natural Frequency of Normal and Injury posterior Cruciate Ligament by Ultrasonography.
Date Issued
2004-07-31
Date
2004-07-31
Author(s)
王亭貴
DOI
922314B002140
Abstract
Tendinitis is a common problem of
athletes. Ultrasonography and Magnetic
Resonance Imaging study are taken as
the standard method to detect the
pathology of tendinitis. However, they
only provide the morphology
information, and lacking of the physical
characteristics. The purpose of this study
attempts to define the nature frequency
(resonance frequency) of patellar tendon
in normal subjects, and detect the
change of nature frequency in injuried
patellar tendon.
Ten healthy normal subjects were
included in this study. The vibrator,
providing a wide range frequency of
vibration, was secured on the medial
2
tibia of the subjects. One accelerometer
was fixed on the patellar tendon to
measure the amplitude of vibration of
patellar tendon in different frequency of
vibration. The tests were performed at
three position of knee joint, representing
different tension of the patellar tendon.
Those are full extension, flexion 60
degree, and flexion 90 degrees of the
knee. The result showed that the patellar
tendon, when full extended, produced
the greatest vibration at 22.5 + 0.8 Hz,
which is the nature frequency. The
greatest vibration occurred at 23.0 + 0.7
Hz when knee flexed 60 degrees, and
occurred at 24.0 + 0.8 Hz when knee
flexed 90 degrees. In addition, the nature
frequency of patellar tendon increased
significantly when the flexion angles of
knee increased. Meanwhile, the right
and left legs had the same nature
frequency of patellar tendon. There were
no frequency change in severe patients
with patellar pathology.
Subjects
Nature frequency
sports
medicine
medicine
patellar tendon
vibration
Publisher
臺北市：國立臺灣大學醫學院復健科
Type
journal article
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