Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_
Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_ Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_
Poster Topic: Sports Medicine - Knee Abstract number: 24346 TENSION CHANGES WITHIN THE ANTEROMEDIAL AND POSTEROLATERAL BUNDLES, AT DIFFERENT KNEE FLEXION ANGLES IN THREE-DIMENSIONAL IN VIVO FINITE ELEMENT MODEL OF THE ANATOMICAL DOUBLE BUNDLE ACL RECONSTRUCTION Young-Jin SEO 1 , yonsik YOO 1 , HJ KIM 2 , HY KIM 2 1 Sports Mediicine Clinic, Orthopaedic Department, College of Medicine, Hallym University, Seoul (KOREA), 2 Gangwon national university, chuncheon (KOREA) The purposes of this study are to evaluate the changes in tension and biomechanical behavior of the reconstructed AM and PL bundles during knee flexion after an anatomical double bundle ACL reconstruction in 3D in vivo finite knee model. Several modeling programs were used to create, manipulate, and analyze the 3D models in five subjects (5 males). Digital length of 2 virtual bundles was measured. The reaction forces and the change of stress distribution within the ligament were assessed. The contact between the AM and PL bundles or the contact between the ligaments and surrounding bony structure were also included. In both AM and PL bundles the length was longest in full extension. Both bundles have been deformed at 45 degree of knee flexion and continued to deform at 90 and 135 degree, which was more prominent in PL bundle. The reaction force of AM graft having 20N at full extension decreased slightly between 45° and 90° of knee flexion and then reached a plateau; meanwhile, the reaction force of PL bundle having 20N at full extension slightly increased at 45° of flexion, then returned to initial force between 90° and 135°. As flexion increased, the PL bundle was wrapp ed around lateral intercondylar tubercle of tibia, which enabled to maintain the tension regardless of loss of its linearityThe regain of ligament tension with flexion by impingement between the bundles and with surrounding bone suggest final tensioning of bundles in extension would regain joint stability at various knee positions. 474
Poster Topic: Sports Medicine - Knee Abstract number: 24352 EVALUATION OF THE POSITION OF THE FEMORAL TUNNELS IN ANATOMIC DOUBLE-BUNDLE Yasushi ONUMA Yamagata Tokushukai General Hospital, Yamagata (JAPAN) INTRODUCTION: Recently, many studies showed that the double bundle ACL reconstruction is superior to the single bundle ACL reconstruction with regard to anterior and rotational stability. The double - bundle ACL reconstruction may more closely restore normal ACL anatomy. Therefore, it is important to create the femoral tunnels on anatomic insertion sites of the ACL in anatomic double - bundle ACL reconstruction. PURPOSE: The purpose of this study was to compare the position of the femoral tunnels created by the transtibial and the far anteromedial portal technique in double - bundle ACL reconstruction. MATERIALS and METHODS: Thirty two consecutive patients, 14 men and 18 women (mean age 25.8 y) underwent double - bundle ACL reconstruction with hamstrings. Eighteen ACL reconstructions by the transtibial technique and fourteen ACL reconstructions by the far anteromedial portal technique. We evaluated the position of the femoral tunnels using 3-D computed tomography. The gap between the acquired positons of femoral tunnels and the optimal position were measured. RESULTS: The far anteromedial portal technique placed the femoral tunnels closer to the optimal position compared with the transtibial technique. The transtibial technique resulted in a more anterior and superior placement of the tunnel compared with the far anteromedial portal technique.CONCLUSION: The far anteromedial portal technique can create the optimal positon of the femoral tunnels than the transtibial technique. 475
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Poster<br />
Topic: Sports Medicine - Knee<br />
Abstract number: 24346<br />
TENSION CHANGES WITHIN THE ANTEROMEDIAL AND POSTEROLATERAL<br />
BUNDLES, AT DIFFERENT KNEE FLEXION ANGLES IN THREE-DIMENSIONAL<br />
IN VIVO FINITE ELEMENT MODEL OF THE ANATOMICAL DOUBLE BUNDLE<br />
ACL RECONSTRUCTION<br />
Young-Jin SEO 1 , yonsik YOO 1 , HJ KIM 2 , HY KIM 2<br />
1 Sports Mediicine Clinic, Orthopaedic Department, College of Medicine, Hallym<br />
University, Seoul (KOREA), 2 Gangwon national university, chuncheon (KOREA)<br />
The purposes of this study are to evaluate the changes in tension and biomechanical<br />
behavior of the reconstructed AM and PL bundles during knee flexion after an<br />
anatomical double bundle ACL reconstruction in 3D in vivo finite knee model. Several<br />
modeling programs were used to create, manipulate, and analyze the 3D models in<br />
five subjects (5 males). Digital length of 2 virtual bundles was measured. The<br />
reaction forces and the change of stress distribution within the ligament were<br />
assessed. The contact between the AM and PL bundles or the contact between the<br />
ligaments and surrounding bony structure were also included. In both AM and PL<br />
bundles the length was longest in full extension. Both bundles have been deformed<br />
at 45 degree of knee flexion and continued to deform at 90 and 135 degree, which<br />
was more prominent in PL bundle. The reaction force of AM graft having 20N at full<br />
extension decreased slightly between 45° and 90° of knee flexion and then reached a<br />
plateau; meanwhile, the reaction force of PL bundle having 20N at full extension<br />
slightly increased at 45° of flexion, then returned to initial force between 90° and<br />
135°. As flexion increased, the PL bundle was wrapp ed around lateral intercondylar<br />
tubercle of tibia, which enabled to maintain the tension regardless of loss of its<br />
linearityThe regain of ligament tension with flexion by impingement between the<br />
bundles and with surrounding bone suggest final tensioning of bundles in extension<br />
would regain joint stability at various knee positions.<br />
474
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