Résumé
Giant cell-rich osteosarcoma is a rare osteosarcoma and easily regarded as giant cell tumor of bone by pathematology.Because two deseases have different therapies,misdiagnosis frequendy affect the operator to select suitable surgical procedures.We described the cage of a patient with giant cell-rich osteosarcoma,non vascularised fibular grafts were used as substitutes for repairing and reconstructing caput humeralis and shaft of humerus after resection for bone tumors on proximal humerus,part functions were remained after the operation.
Résumé
[Objective]To analyze the mechanism of shape memory alloy imrasegmental fixator for lumbar spondylolysis(WMAIF)with finite element method.[Method]The three-dimensional model of WMAIF was established by using ANSYS 8.0 software for large finite element analysis.The model was extended with restriction in different parts,and to undertake corresponding mechanics calculation.[Result]The finite element model of WMAIF was set up,which could predict the strength and displacement of every node and element of its own structure in the course of deforming.[Conclusion]WMAIF is strong enough against tensile stress,which is a new and reliable intrasegmental instrument for direct repairing of lumbar spondylolysis.
Résumé
[Objective]To investigate the influence of wing-like memory alloy intrasegmental fixator(WMAIF)on healing of lumbar spondylolysis.[Method]Eighteen healthy hybrid adult dogs were used in the experiment,regardless of gender,the L_6 isthmic portion were injured by operation randomly and equally divided into three groups.Group Ⅰ were fixed with WMAIF,groupⅡ were fixed with steel wire,group Ⅲ were treated with nothing.Every group was examined through CT at 2,4,6,8 and 10 weeks.[Result]In group Ⅰ,the fracture achieved healing at 6 weeks after operation.In group Ⅱ,the fracture achieved healing at 10 weeks after operation,while no repair of fracture was found in group Ⅲ.[Conclusion]Lumber spondylolysis fixation with WMAIF has stable and continued axial stress,WMAIF is beneficial to fracture healing,and is a new and reliable intrasegmental instrument for direct repair of lumbar spondylolysis.