9 January 2008 Evaluation of manual test for anterior cruciate ligament injury using a body-mounted sensor
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Proceedings Volume 6794, ICMIT 2007: Mechatronics, MEMS, and Smart Materials; 67943T (2008); doi: 10.1117/12.783984
Event: ICMIT 2007: Mechatronics, MEMS, and Smart Materials, 2007, Gifu, Japan
Abstract
Diagnosis method of anterior cruciate ligament (ACL) using body-mounted sensor is discussed. A wide variety of diagnosis method such as Pivot Shift Test (PST), Lachman Test and monitoring of jump motion (JT) are applied to examine the injured ACL. These methods, however, depend on the ability and the experience of examiner. The proposed method numerically provides three dimensional translation and rotation of the knee by using a newly developed 3D sensor. The 3D sensor is composed of three accelerometers and three gyroscopes. Measured acceleration of the knee during the examination is converted to the fixed system of coordinate according the acceleration of gravity and 3D rotation of the sensor, and is numerically integrated to derive 3D trajectory and rotation angle around the tibia. The experimental results of JT suggest that unsymmetrical movement of rotation angle of the tibia and sudden movement of estimated 3D trajectory show instability of knee joint. From the results of PST analysis, it is observed that the tibial angular velocity around the flexed position changes 41.6 [deg/s] at the injured side and 21.7 [deg/s] at the intact side. This result suggests the reposition of injured knee from subluxation.
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R. Yoshida, K. Sagawa, T. Tsukamoto, Y. Ishibashi, "Evaluation of manual test for anterior cruciate ligament injury using a body-mounted sensor", Proc. SPIE 6794, ICMIT 2007: Mechatronics, MEMS, and Smart Materials, 67943T (9 January 2008); doi: 10.1117/12.783984; https://doi.org/10.1117/12.783984
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KEYWORDS
Sensors

Injuries

3D metrology

Gyroscopes

Magnetic resonance imaging

Motion estimation

Analog electronics

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