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Anterior cruciate ligament (ACL) injury and knee osteoarthritis are well-known injuries of the knee joint, and pivot shift is a symptom of the ACL injury. Today, to diagnose the pivot shift phenomenon, the manual testing is examined for the early diagnosis, however, it should be affected by inter- and intra observer variability. This article proposes a novel system for detecting and quantifying the...
Knee kinematics in the every daily life or during the sports activities attracts the considerable attentions. Advances in micro electro mechanical system technologies produce many types of mobile sensors. This article introduces a system-of-systems (SoS) which estimates the knee kinematics by integrating MARG sensor and pressure sensor. Each sensor is with miniature size, low power consumption and...
The pivot shift test has been performed to assess the instability of the knee caused by anterior cruciate ligament (ACL) injuries. However, the test depends on the clinicianpsilas subjective feeling. In this study, inertial and magnetic sensors have been introduced into quantitative evaluation of the pivot shift test. The analysis method extracts the knee movement of the pivot shift by using wavelet...
Analyzing knee kinematics after total knee arthroplasty (TKA) has been attracting considerable attentions because the knee kinematics can be used to evaluate TKA patients and to evaluate TKA operations and design of knee implants. Knee kinematics can be estimated by 2-D/3-D image registration from 3-D computer-aided design (CAD) models of knee implants to 2-D X-ray image. Although there are many studies...
Rupture of anterior cruciate ligament (ACL) is a serious problem which causes in functional stability of the knee joint. To restore the knee injury, surgical operations, which replace the damaged ACL, have been applied. After ACL reconstruction, it is important to numerically evaluate the knee kinematics to diagnose the ACL reconstruction patients and to evaluate ACL reconstruction operation techniques...
Elasticity imaging is a new approach to diagnose the state of tissues in vivo. Almost all of elasticity imaging methods have been studied using ultrasound. However, such ultrasound systems can not be applied to the pulmonary tissues because the lung is fulfilled with air and almost power of ultrasound is reflected at the boundary of the lung. This paper proposes a novel tissue elasticity imaging method...
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