김성환 교수

Background: Conflicting results have been reported concerning the progression of medial meniscal extrusion (MME) after arthroscopic transtibial pull-out repair of medial meniscus posterior root tear (MMRT), and no study has evaluated the relevant factors affecting the progression of MME. Purpose: To (1) evaluate the subjective and objective surgical outcomes of arthroscopic transtibial pull-out repair of MMRT and (2) identify relevant factors affecting the progression of MME after surgery. Study

BACKGROUND: While the medial meniscal posterior horn (MMPH) is reported to bear a considerable portion of overall load on the knee joint, including compressive and shear forces, no study has yet investigated the relationship between the MMPH and posterior tibial slope (PTS), which is a geometric factor associated with the shear force component in the presence of a compressive load in the knee joint. HYPOTHESIS/PURPOSE: The purpose was to investigate the relationship between the PTS and MMPH tear

Abstract Background Although the measurement of coronal alignment of the lower limb on conventional full-length weight-bearing anteroposterior (FLWAP) radiographs was reported to be influenced by the knee joint rotation, no comparative analysis was performed considering the effects of knee joint rotation on the sagittal and axial planes simultaneously using the three-dimensional images while taking into account the actual weight-bearing conditions. The aim of this study was to investigate the ef

Traumatic and degenerative lesions of articular cartilage usually progress to osteoarthritis (OA), a leading cause of disability in humans. MicroRNAs (miRNAs) can regulate the differentiation of human bone marrow-derived mesenchymal stem cells (hBMSCs) and play important roles in the expression of genes related to OA. However, their functional roles in OA remain poorly understood. Here, we have examined miR-449a, which targets sirtuin 1 (SIRT1) and lymphoid enhancer-binding factor-1 (LEF-1), and

BACKGROUND: Increased varus alignment of the lower extremity is known to be a poor prognostic factor for the surgical repair for a medial meniscus root tear (MMRT). However, given the concept of constitutional varus, which is present in a substantial portion of the normal population, the generally accepted surgical indication for MMRT concerning a varus alignment of 5° may be unnecessarily narrow. PURPOSE: To compare the surgical outcomes of arthroscopic transtibial pullout repair of MMRT accord

PURPOSE: To investigate relevant factors influencing increases in medial joint space width (JSW) after medial open-wedge high tibial osteotomy (MOWHTO). METHODS: Between January 2010 and December 2018, the electronic medical records of consecutive patients who underwent MOWHTO and subsequent second-look arthroscopic assessment at least 12 months after MOWHTO were retrospectively evaluated. The patients were classified into 2 groups according to changes in the medial JSW of the knee at the time o

BACKGROUND: Despite persistent continuity of the attenuated posterior cruciate ligament (PCL) in most PCL insufficient knees, few reconstruction techniques that preserve the PCL remnant have been presented. Furthermore, data regarding the clinical outcomes of these approaches are even more limited, and the clinical validity of remnant preservation has not yet been established. PURPOSE: To compare the clinical outcomes of transtibial PCL reconstructions that incorporate remnant preservation with

PURPOSE: To analyze the effect of percutaneous pie-crusting medial release on valgus laxity before and after surgery and on clinical outcomes. METHODS: Eight-hundred fourteen consecutive patients who underwent an arthroscopic procedure for the medial compartment of the knee were evaluated retrospectively. Sex, age, type of operation (meniscectomy, meniscal repair, and posterior root repair), type of accompanying surgery (none, cartilage procedure, ligament procedure and osteotomy) were documente

Medial meniscus posterior root tears (MMRTs), defined as tears or avulsions that occur within 1 cm of the tibial attachment of the medial meniscus posterior root, lead to biomechanically detrimental knee conditions by creating a functionally meniscal-deficient status. Given their biomechanical significance, MMRTs have recently been gaining increasing interest. Accordingly, numerous studies have been conducted on the anatomy, biomechanics, clinical features, diagnosis, and treatment of MMRTs, and

회계정보의 보수성은 대리인 비용의 절감을 통해서 주인(Principle)과 대리인(Agent) 간의 거래를 촉진하는 수단이 될수 있다. 대리인 비용이 지배구조에 영향을 받게 된다면, 지배구조에 따라서 대리인 비용의 절감을 위한 회계정보의 보수성이 서로 다르게 나타날 가능성이 있다. 따라서 지배구조와 회계정보의 보수성 간의 관계를 살펴봄으로써, 회계정보에대한 시장압력, 경영자의 회계선택 등에 대한 이해를 높일 수 있을 것이다. 소유와 경영이 분리되어 있는 영미권 국가에서는 주주와 전문경영자 간의 대리인 문제가 주된 이슈가 될 수 있으며, 이에 따라 전문경영자의 지분율이 회계정보의 보수성에 영향을 미칠 수 있다(Lafond and Roychowdhury 2008). 그러나 La Porta et al.(1998, 1999, 2000)은국가 간 비교를 통해서 소수주주에 대한 법적인 보호가 약한 국가에서는 지배주주에 의한 소수주주의 이익침해가 나타날수 있음을 제시하였다. 국내와 같이 소유와

BACKGROUND: The literature has seldom investigated the anterior cruciate ligament (ACL) tunnel position while considering the effect of rotation of 3-dimensional computed tomography (3D-CT) images during measurements. HYPOTHESIS: We hypothesized that (1) measurement of the ACL tunnel position in the femur and tibia through use of 3D-CT is considerably influenced by rotation of the 3D model and (2) there exists a reliable measurement method for ACL tunnel position least affected by rotation. STUD