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퇴행성 관절염 환자의 경대퇴관절의 연골 대 연골 접촉에 관한 연구
신충수(Choongsoo Shin),리차드 사우자(Richard Souza),샤밀라 마줌다(Sharmila Majumdar) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Cartilage contact mechanics is essential to understand osteoarthritis, but in vivo cartilage contact mechanics of the knee joint remains unknown. We investigated the influence of loading on in vivo tibiofemoral contact area changes and studied whether in vivo tibiofemoral contact area of subjects with knee osteoarthritis and healthy controls differs. Subjects with radiographic evidence of knee osteoarthritis and control subjects were tested. The coronal 3D-SPGR MR images were acquired under both unloaded and loaded conditions. Tibiofemoral cartilage contact areas were measured using image-based three-dimensional models. Acute loading on the knee joint significantly increased in vivo tibiofemoral contact area in both compartments. The in vivo tibiofemoral contact area in the medial compartment is significantly larger under loaded conditions. Compared with healthy controls, subjects with knee osteoarthritis have significantly larger contact areas under both unloaded and loaded condition.
이승훈(Seunghoon Lee),신충수(Choongsoo Shin) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Increasing the shod-surface traction has been shown to lead to increased incidence of anterior cruciate ligament (ACL) injuries, however it remains unclear how these shoes may affect the knee kinematics and kinetics during single-leg landing. The purpose of this study was to determine whether shoe wear alters valgus moment and tibial internal rotation moment. Healthy male subjects were recruited and instructed to perform single-leg landing from 0.3-m heights in barefoot and shod conditions. Force-plates and motion-capture system were used to capture ground reaction force (GRF) and kinematics data respectively. Peak knee valgus moment (p<0.01) and peak tibial internal rotation moment (p<0.01) were higher during shod landing, compared to barefoot landing. In conclusion, this study has shown that shod condition was associated with biomechanical conditions that can increase the risk of ACL injury.
정지영(Jiyoung Jeong),신충수(Choongsoo Shin) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The purpose of this study was to examine the relationship between thigh muscular parameters and the knee joint kinematics during gait. Sixteen males and fourteen females participated in this study. Both muscle thickness and echo intensity parameters of all individual quadriceps and hamstrings were collected using ultrasound system, and knee joint kinematics during gait at preferred speed were measured using motion capture system. Regression analyses were performed at a significance level of 0.05. Vastus medialis muscle thickness was correlated with knee flexion angle and valgus angle at initial contact. Peak knee flexion angle was correlated with hamstring to quadrecep muscle thickness ratio, biceps femoris echo intensity, and gait stride. Range of motion in frontal plane and transverse plane were correlated with vastus intermedius & vastus medialis echo intensity and semitendinosus & gait speed, respectively. In conclusion, individual thigh muscle structure plays an important role in knee kinematics during gait.
정지영(Jiyoung Jeong),신충수(Choongsoo S. Shin) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Dynamic balance is an ability to maintain stable position while performing various tasks and it has been reported that dynamic balance associated with athletic performance and injury risks. The purpose of study was to examine the effect of core strength on dynamic balance. Nineteen males completed 10-week core training interventions. To test the core strength, a trunk endurance test was used. During this test, the plank and side-plank positions were maintained for as long as possible. The star excursion balance test (SEBT) were conducted before and after core training to measure the dynamic balance. Plank records and SEBT parameters were compared using a paired Student’s t-tests at a significance level of 0.05. Greater plank and left/right side plank record were found in post-training (p=0.008, p=0.049, and p=0.007 respectively), thus the core muscle strength increased after training. As the SEBT results, greater anterior, anteromedial, medial, posteromedial, posterior, posterolateral reach distances were found between pre- and post-training, but there was no significant differences in lateral and anterolateral distances. These results indicate that strengthening of core muscle increase the dynamic balance, thereby it positively affected in lower extremity injury risk.