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Kyungsoo Kim,DAVAASAMBUU BAYASGALAN,Ruoyu Wei,Yoon Hyuk Kim 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.2
The anterior cruciate ligament (ACL) is part of the knee joint injured during taekwondo kicking. However, few studies have investigated the ACL injury mechanism and its inherent risk factors. In this study, we compared the knee joint kinematics in the pivoting leg during eight typical taekwondo kicks (back, roundhouse, turning-back, hook, side, push, axe, and front kicks) to investigate the possible risk of ACL injury. Standard inverse dynamics analyses were used to calculate axial tibial rotation and knee joint varus-valgus moment using a musculoskeletal model of the lower extremity and a motion analysis system with six high-speed digital cameras and a force plate. The maximum values of internal tibial rotation and valgus moment in the pivot leg were investigated. In addition, the time interval when the internal rotation and/or valgus moment exceeded the upper limit of the safe region during the kicking was analyzed. The results revealed that most kicks had time intervals of excessive amounts of internal tibial rotation and/or knee valgus moment, which are related to the risk of ACL injury. Moreover, one particular kicking motion, the hook kick, has a relatively high ACL injury risk in the pivot leg compared to other kicking motions. We suggest that athletes and coaches be aware of these risky kicks.
Development of 3D pelvic motion measurement system using an IMU sensor
Ruoyu Wei(위약우),Bayasgalan Davaasambuu(바아상갈 다바삼부),Kyungsoo Kim(김윤혁) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Every country is experiencing the aging population and increasing number of patients suffering from the joint diseases. The most common form of arthritis is osteoarthritis (OA), and total hip arthroplasty (THA) is recognized as reliable surgery with the high satisfaction and relative success rate. Even though, the failure rate of total hip arthroplasty surgeries is up to 10% following primary surgery and 28% after revision arthroplasty. In order to achieve the higher accuracy, anterior pelvic plane (APP) can be used as an anatomical reference for the navigation system during THA. The anterior pelvic plane was defined as the plane formed by the bilateral anterior superior iliac spines and the upper margin of the pubic symphystic. The previous methods such as EOS imaging, computed tomography (CT) can only provide the static pelvic models. Our study develops a IMU-based three-dimension (3D) pelvic motion measurement system that can work on Android tablet devices. Ten male volunteers participated in the validation experiment using the 10 sets of left side sagittal and posterior x-ray images. The result shows the APP orientation mean error showed between 1.56 degrees to 0.05 degrees. We demonstrated that our device can be used as a pelvic orientation system for patients and surgeons in the clinical environment.
Yoon Hyuk Kim(김윤혁),Ruoyu Wei(위약우),Bayasgalan Davaasambuu(바이상갈란 다바삼부) 대한인간공학회 2021 대한인간공학회 학술대회논문집 Vol.2021 No.11
Objective: The aim of present study was to develop an IMU-based three-dimension (3D) pelvic motion measurement system that can work on Android tablet devices. Background: Every country is experiencing the aging population and increasing number of patients suffering from the joint diseases. The most common form of arthritis is osteoarthritis (OA), and total hip arthroplasty (THA) is recognized as reliable surgery with the high satisfaction and relative success rate. Even though, the failure rate of total hip arthroplasty surgeries is up to 10% following primary surgery and 28% after revision arthroplasty. Method: In order to achieve the higher accuracy, anterior pelvic plane (APP) can be used as an anatomical reference for the navigation system during THA. The anterior pelvic plane was defined as the plane formed by the bilateral anterior superior iliac spines and the upper margin of the pubic symphystic. The previous methods such as EOS imaging, computed tomography (CT) can only provide the static pelvic models. Ten male volunteers participated in the validation experiment using the 10 sets of left side sagittal and posterior x-ray images. Results: The result shows the APP orientation mean error showed between 1.56 degrees to 0.05 degrees. The inter-variability and intra-variability among 10 subjects were maximally within 2-3 degrees which is acceptable in clinical application. Conclusion: We demonstrated that our device can be used as a pelvic orientation system for patients and surgeons in the clinical environment. Application: The developed technology and mobile app can be utilized in orthopaedic joint surgical planning and evaluation of post-surgical outcomes.