• 대한족부족관절학회지
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• 제8권1호
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• pp.11-15
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• 2004

Purpose: The aim of this study was to investigate the usefulness of mortise angle and fibular length measured in radiologic findings in predicting the ankle stability. Materials and Methods: One hundred cases fifty cases were randomly selected volunteers with normal ankle function and the other fifty cases were randomly selected patients whose ankle were treated in our hospital and who were followed for over 1 years with good results. A specific experimental fixture were made to get the even AP and lateral view and objective stress view. Results: The mortise angle and fibular length was not statistically significant to the degree of talar tilt angle under valgus or varus stress and that of displacement under anterior or posterior stress. Conclusion: The mortise angle and fibular length was not the objective predicting factors on the ankle stability. Maintenance of constrained talus in dynamic status is most important factors in determining the ankle stability.

• Structural Engineering and Mechanics
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• 제77권4호
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• pp.509-521
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• 2021

The neighbouring gaps at the mortise-tenon joint in traditional timber structure, which leads to the complexity of the joint, are considered to impair the mechanical performance of the joint. In this paper, numerical simulation of loose joint was conducted to examine the deformation states, stress distributions, and bearing capacities, which was verified by full-scale test. On the basis of the experimental and numerical results, a simplified mechanics model with gaps has been proposed to present the bending capacity of the loose joint. Besides, the gap effects and parameter studies on the influences of tenon height, friction coefficient, elastic modulus and axial load were also investigated. As a result, the estimated relationship between moment and rotation angle of loose joint showed the agreement with the numerical results, demonstrating validity of the proposed model; The bending bearing capacity and rotational stiffness of loose joint had a certain drop with the increasing of gaps; and the tenon height may be the most important factor affecting the mechanical behaviors of the joint when it is subjected to repeated load; Research results can provide important references on the condition assessments of the existing mortise-tenon joint.

• Archives of Reconstructive Microsurgery
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• 제12권2호
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• pp.93-98
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• 2003

Purpose : The purpose of this study is to investigate an occurrence of valgus deformity of ankle joint after vascularized fibular graft in children. Materials and Methods : Four children under 15 years who were surgically treated with vascularized fibular graft were studied. The age of the patients was from 4 years to 13 years, the follow-up period was from 24 months to 108 months. The causes of vascularized fibular graft were open fracture (1 case), congenital psuedarthrosis (2 cases), hypoplastic ulna (1 case). The tibiofibular synostosis was done in 3 cases and not in 1 case. We measured the tibiotalar angle and bimalleolar angle at immediately postoperative and final radiography, and checked ankle motion, pain, and instability of ankle joint. Results : The A-P mortise angle was not different between initial and final radiography in all cases. The intermalleolar angle increased in all cases at the final radiography. There were no pain, instability and limitation of ankle motion. Conclusion: We consider the tibiofibular synostosis can prevent from ankle valgus deformity after vascularized fibular graft in children.

• Journal of the Korean Wood Science and Technology
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• 제38권3호
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• pp.199-204
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• 2010

전통공법에서는 주로 소나무를 수가공하여 구조부재로 사용하고 있다. 주먹장 접합(이음, 맞춤)은 일반 가구나 구조부재의 접합에 사용되고 있으며, 수가공이나 간단한 기계가공에 의해 쉽게 가공할 수 있는 이점이 있다. 비록 외관상 선형적인 가공이 주를 이루지만, 손쉬운 짜맞춤이 될 수 있어야 하는 고도의 가공정밀성이 요구된다. 더욱이, 장부와 장부받이는 틈새없는 긴결한 접합이 이루어져야 한다. 주먹장접합부에 대한 과학적인 연구는 체계적으로 수행된 예가 많지 않으므로 전통공법과 국산재 활용이라는 관점에서 낙엽송집성재를 기계가공하여 이용하였다. 통주먹장이음 접합부의 인장성능을 파악하기 위하여 150 mm 정각 낙엽송 집성재를 사용하였으며, 내력성능에 영향을 끼치는 주먹장의 다양한 기하학적 요소(장부 너비, 길이, 각도)에 대해 조사하였다. 보강목을 설치하지 않은 시험편은 장부받이(장부홈)의 모서리부에서 할렬이 발생하며 내력도 낮게 나타났다. 기둥머리의 화통맞춤 및 주두와 같은 상황을 고려한 보강시험편은 최대인장내력에서 2배 이상의 성능을 발휘하였다. 장부의 적정각도는 25도 수준이었으며, 어깨폭의 변화와는 상관성이 없는 것으로 나타났다.