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슬관절 골관절염 환자에서 경골 근위부, 요추, 대퇴골 근위부의 골밀도 및 하지 정렬과의 상관 관계
조우신 ( Woo Shin Cho ),변화교 ( Hwa Kyo Byeon ),박호연 ( Ho Youn Park ),정홍준 ( Hong Jun Jung ) 대한슬관절학회 2009 대한슬관절학회지 Vol.21 No.4
Purpose: The purpose of this study was to measure the bone mineral density (BMD) of the proximal tibia, lumbar spine and proximal femur and to determine out their correlations with the knee alignment in knee osteoarthritic (OA) patients. Materials and Methods: The study involved 203 patients (322 knees) with knee osteoarthritis and who had underwent total knee arthroplasty from July 2005 to September 2006. The BMDs of the proximal tibia, lumbar spine and proximal femur were measured and compared. The knee alignment was checked and its correlation with each BMD was analyzed. Results: The mean BMD of the medial proximal tibia, lateral proximal tibia, lumbar spine and proximal femur were 0.857±0.180 g/cm2, 0.772±0.177 g/cm2, 0.940±0.174 g/cm2, and 0.721±0.126 g/cm2, respectively. The mean knee alignment was 10.2±4.7o varus and the deformity got severe as the BMD of the lateral proximal tibia, lumbar spine and proximal femur were lower and that of the medial proximal tibia was higher. Conclusion: The BMD of the proximal tibia was lower than that of the lumbar spine and higher than that of the proximal femur in patients with knee osteoarthritis. The BMDs of the lateral proximal tibia, lumbar spine and proximal femur were negatively correlated with the degree of varus deformity, but that of the medial proximal tibia was positively correlated.
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조우신(Woo-Shin Cho),김병관(Byung-Kwan Kim),우제호(Je-Ho Woo),염윤석(Yoon-Seok Youm),변화교(Hwa-Kyo Byeon) 대한정형외과학회 2008 대한정형외과학회지 Vol.43 No.6
목적: 인공관절 치환술에서 치환물에 시멘팅을 하는 시간에 따른 치환물과 시멘트 사이의 결합강도의 변화를 알아보고자 하였다. 대상 및 방법: 인공 슬관절에 흔히 사용되는 CMW<SUP>®</SUP> 1과 CMW<SUP>®</SUP> 3 (Depuy Ltd., Blackpool, UK) 두 가지 종류의 시멘트를 사용하였다. CMW<SUP>®</SUP> 1을 시멘팅 후 각각 2, 4, 5, 6분 후에, CMW<SUP>®</SUP> 3은 각각 3, 5, 6, 7분 후에 치환물에서 잘라낸 금속블럭 위에서 압력을 가하여 접착시키고 36.5℃ 생리식염수에 24시간 담근 후, Instron Model 8874를 이용하여 인장강도를 측정하였다. 인장응력은 10 ㎜/min의 비율로 시멘트가 금속블럭에서 분리될 때까지 가하였다. Kruskal-Wallis test와 Mann-Whitney U test를 이용하여 통계학적 차이에 대한 유의성을 판정하였다. 결과: CMW<SUP>®</SUP> 1의 경우 2분 후, CMW<SUP>®</SUP> 3의 경우는 3분 후 최대 인장강도를 나타내었으며, 5분 후와 6분 후 인장강도는 각각 급격히 감소하였다. 결론: 시멘팅 시간에 따른 결합강도의 변화를 고려하여 적절한 시멘팅 시간을 지킴으로써 해리 현상을 줄일 수 있을 것으로 사료된다. Purpose: The objective of this study was to compare the bonding strength between cement and an implant according to the cementing time. Materials and Methods: The two types of cement used were CMW<SUP>®</SUP> and 3 (Depuy Ltd., Blackpool, UK). Plastic molds containing CMW<SUP>®</SUP> 1 were pressed onto metal blocks at 2, 4, 5 or 6 minutes after mixing the cement, while molds containing CMW<SUP>®</SUP> 3 were pressed onto blocks at 3, 5, 6 or 7 minutes after mixing the cement. Tensile strength was tested with using an Instron Model 8874 (Instron Corp., Canton, MA, USA). Tensile strengths were compared using the Kruskal-Wallis test and the Mann-Whitney U test. Results: The strongest bonding strengths for the tensile load were at 2 minutes post-mixing for CMW<SUP>®</SUP> 1, and at 3 minutes post-mixing for CMW<SUP>®</SUP> 3. The strength rapidly decreased after 5 minutes for CMW<SUP>®</SUP> 1 and after 6 minutes for CMW<SUP>®</SUP> 3. Conclusion: This study suggests that the risk of loosening between cement and an implant is likely to be minimized by the surgical technique that considers the bonding strength according to time.
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