Fricka Kevin B, Mahar Andrew T, Lee Steven S, Newton Peter O
Department of Orthopaedic Surgery, Children's Hospital, San Diego, California, USA.
J Pediatr Orthop. 2004 Mar-Apr;24(2):167-71. doi: 10.1097/00004694-200403000-00006.
Biomechanical testing was performed to evaluate the stability of simulated transverse and comminuted femoral fractures after retrograde and antegrade flexible titanium intramedullary nail fixation. Ten synthetic adolescent-sized femoral bone models were used. Five underwent retrograde fixation with two C-shaped nails inserted from medial and lateral entry portals. The other five underwent antegrade fixation using one C- and one S-shaped nail through lateral entry holes just inferior to the greater trochanter. Retrograde nail fixation demonstrated significantly less axial range of motion and greater torsional stiffness than antegrade fixation in both transverse and comminuted fracture patterns. However, there appeared to be a biomechanical trend of greater resistance to shortening for antegrade nails.
进行生物力学测试以评估逆行和顺行弹性钛髓内钉固定后模拟的股骨横行骨折和粉碎性骨折的稳定性。使用了10个合成的青少年尺寸的股骨模型。其中5个通过从内侧和外侧入口置入两枚C形钉进行逆行固定。另外5个通过在大转子下方的外侧入口孔使用一枚C形钉和一枚S形钉进行顺行固定。在横行和粉碎性骨折模式中，逆行髓内钉固定均显示出比顺行固定显著更小的轴向活动范围和更大的扭转刚度。然而，顺行髓内钉似乎存在更大的抗缩短生物力学趋势。
