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Tenan, South Korea

Jang Y.W.,Sejong University | Kwon S.-Y.,Yonsei University | Kim J.S.,Konyang University | Yoo O.S.,Corentec Co. | And 2 more authors.
International Journal of Precision Engineering and Manufacturing | Year: 2015

Artificial composite tibiae have been widely used for mechanical evaluations of total knee arthoplasty (TKA) because of their low variability and wide availability. However, little information is available about whether artificial defects created during production significantly change the distribution of stress and micromotion within composite tibiae during a mechanical evaluation for TKA. The purpose of this study was to determine the effects of artificial defects on alterations in stress distribution and micromotion in composite tibiae during a mechanical evaluation for TKA using finite element (FE) analysis. The results showed that von Mises stresses near the artificial defect were approximately 1.6-fold higher than those on the same regions of composite tibiae without artificial defects. However, the difference in von Mises stresses decreased gradually beginning 3 mm from the center of the artificial defect. Micromotion in composite tibiae with artificial defects was similar to that of tibiae without artificial defects. These findings suggest that stress/strain on the cortical bone surface should be measured at least 3 mm from artificial defect centers but that micromotion is not affected by the artificial defects during a mechanical evaluation for TKA using composite tibiae. © 2015, Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg. Source


Han P.,Sejong University | Jang Y.W.,Sejong University | Kim J.S.,Konyang University | Yoo O.S.,Corentec Co. | And 2 more authors.
International Journal of Precision Engineering and Manufacturing | Year: 2014

This study aimed to determine the clinical applicability of the new TKA by evaluating biomechanical stability through measurement of contact pressure and strain distribution in the proximal tibia during the stand-sit-stand motion. The reaction forces generated during knee flexion from 0° to 140° were measured in eight men (25±2 years, 23±4 kg/m2) using two force-plates integrated with a computer-aided video motion capture system and were used for load applications in the mechanical test to identify the contact pressure and strain distribution in the tibia with the new TKA. The results indicate that the new TKA may be appropriate for sharing and transfer of physiological loads on the tibia without critical damage to the tibia and TKA during the high deep flexion associated with the stand-sit-stand motion. © 2014, Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg. Source


An acetabular cup assembly for an artificial hip joint includes an acetabular cup including a seating recess, a female taper formed on an inner wall, protrusion recesses formed to communicate with the seating recess and insertion recesses each positioned inside a corresponding one of the protrusion recesses; and a bearing including a male taper on an outer circumference thereof, protrusions inserted into the protrusion recesses, and insertion protruding portions each formed on a corresponding one of the protrusions, the insertion protruding portions being inserted into the insertion recesses. A polyethylene bearing can be firmly fixed to the acetabular cup. When a ceramic bearing made is inserted into the acetabular cup, the area where the bearing adjoins the acetabular cup is increased, thereby preventing the ceramic bearing from being broken. Since no groove is formed along the entire circumference of the acetabular cup, the strength is increased.


A device for positioning a knee joint line for revision total knee arthroplasty. In revision total knee arthroplasty, the position of the joint line of an existing femoral element is measured before the existing femoral element is removed from the femur in revision total knee arthroplasty. A new femoral element is implanted according to the measured position of the joint line. The joint line is formed at the same position as the joint line of the other leg. The position of the surface of the femur to be cut is determined based on the position of the joint line when a loss or the like in the femur must be compensated for by implanting a block between the femur and the femoral element.


The present invention relates to an implant which is surgically inserted in vivo such as an artificial knee joint or artificial hip joint. More particularly, the present invention relates to an implant for in-vivo insertion, wherein the porosity of a porous coating layer formed on the surface of the implant, thus increasing the bone adhesion of the implant into pores, the adhesivity between the implant and the porous coating layer and the adhesivity between particles in the porous coating layer, wherein vertically-curved pores each having a radius of 100300 m are formed in the porous coating layer to increase the adhesivity of the implant to the bone growing into the pores, thus increasing bone adhesion, and wherein the ratio of interconnected pores in the porous coating layer is increased, and thus bones growing into the pores are interconnected, thereby increasing the adhesivity between the implant and the bones.

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