• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2016.11a
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• pp.117-117
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• 2016

Total ankle replacement (TAR) is a visible option in the surgical treatment of degenerative or inflammatory diseases of ankle joint. it is attributed to the current TAR which has improvements in surgical technique, uncemented implant fixation and minimally constrained articulation. In the clinical result, they can show promised surgical result when compared to earlier attempts in TAR. However, TAR is still not as successful as total knee replacement (TKR) or total hip replacement (THR), it needs to be note that there are limitations in concerning of long term performance of TAR, the high failure rate still associated with wear of the PE (polyethylene) component that has related with their material property and surface roughness. The aim of this study was to introduce the tribology characteristics of total ankle joint prosthesis with one of TDR model which was fabricated to try multi-axis wear test as a region of motion in ankle joint. The wear specimen of TDR was prepared with Ti-6Al-4V alloy and UHMWPE (ultra-high molecular weight polyethylene) for tibia-talus and bearing component, respectively. A wear test was carried out using a Force 5 (AMTI, Massachusetts, US) wear simulator which can be allowed to move in three axis to flexion-extension ($+3^{\circ}{\sim}-6^{\circ}$), internal-external axial rotation (${\pm}5^{\circ}$), as well as sinusoidal compressive load (1.6 kN, R=10). All tests were performed following standard ISO 14243, wear rate was calculated with weight loss of UHMWPE bearing while the specimen has tested at certain cycles. As based on the preliminary results, wear rate of UHMWPE bearing was $7.9{\times}10^{-6}mg/cycles$ ($R^2=0.86$), calculated loss weight until $10^7cycles$ was 79 mg, respectively.

• Journal of Korean Orthopaedic Sports Medicine
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• v.2 no.2
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• pp.77-81
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• 2003

Purpose: The biomechanics and kinematics of knee joint were reviewed in this article. And then the common sports injuries were presented. Anatomy and Kinetics: None of the pairs of bearing surfaces in the knee joint is exactly congruent This allows the knee six degrees of freedom of motion. Tibiofemoral Kinematics: In flexion and extension, the axis of motion is not perpendicular to the medial-lateral plane of the joint, nor is it perpendicular to the axis of longitudinal rotation. This results in coupled varus angulation and internal rotation with flexion and in valgus angulation and external rotation with extension. Patellofemoral Articulation: Loads across the patellofemoral joint are indirectly related to the angle of knee flexion and directly related to the force generated within the quadriceps mechanism. Fractures of the Patella: Nonoperative treatment is indicated if the extensor mechanism is intact and if displacement of fragment is minimal. The specific type of internal fixation depends on the fracture pattern. It is important to repair retinaculum. Acute and Recurrent Patellar Instability: The degree of dysplasia and the extent of the instability play a large part in determining the success of nonoperative treatment. Patients who experience recurrent dislocations and patients with major anatomic variations require surgery to minimize their instability. Sports Injuries in School-age Atheletes: Patellar pain in young athletes groups a number of conditions, including Idiopathic Adolescent Anterior Knee Pain, Osgood- Schlatter Disease, and Sinding-Larsen-Johansson Disease.

• (The)Study of the Eastern Classic
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• no.35
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• pp.161-188
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• 2009

Confucianism's concept of Ye is ruled by the absolute principle of the universe on one hand, and by "the rules of Ye(節文)" and "the rules of ceremony(儀則)", the principle of relative articulation on the other hand. The realizations of the absolute principle of Ye is depending on its usage in everyday life which is fundamentally conditioned by time and space. Thus, Ye's usage can be maximized when the fundamental principle and the condition of its usage make a mutual harmony. Of course, Ye and Ak(樂) are doing complementary roles for each other, since Ye is a principle of a division and Ak is a principle of combining features. However, the essence of Ye can be figured out as the characteristics of mutual reciprocity among things of hierarchy between the classes. Not only in Modern one But also in the medieval society, Ye was not a one-sided force. The essence of Ye does not retain the interests of an individual and the power of a group. If so, the formal aspects of Ye had been distorted. Confucianism demands a strict morality and ethics of a normal person as well as of the ruler. The characteristics of Ye is democratic and open to the condition of time and space. Yegyo should be rooted in everyday lives and realized as a usualness. Therefore, Shirak was an inevitable feature of Yegyo. During the 16th and the 17th century, Ye insinuated into everyday lives of the public in the Korean society. Yulgok Yiyi(李珥)'s Haejuhyangyak(海州鄕約) was estimated as the exemplary feature of Shirak.