BACKGROUND: A new implant has been developed to fix the stable intertrochanteric fractures.rnOBJECTIVE: To compare the biomechanical characteristics of self-made minimally invasive proximal femoral plate (SPFP) and dynamic hip screw (DHS) for stable intertrochanteric fractures of the femur.rnMETHODS: The dry femur specimens were collected and the AO type A1.3 stable intertrochanteric fracture model was created successively and fixed with SPFP and DHS respectively. Then, six varistors were arranged along the internal and lateral cortex in the proximal femur. The compression, bending, shear and torsion were detected after fixation.rnRESULTS AND CONCLUSION: After the stable intertrochanteric fractures of the femur was fixed with SPFP, the internal and lateral strength were 13% higher than that after fixed with DHS, and the internal strength was 16% higher, the torsional strength was18% higher and the torsional stiffness was 31 % higher than that after fixed with DHS. There was significant difference between SPFP and DHS fixation (P < 0.05). Compared the biomechanical characteristics of SPFP and DHS, SPFP had distinctive advantages over DHS in anti-tensile, anti-press, anti-rotation and varus ability.%背景:研制一种新型植入物用于固定稳定型股骨转子间骨折.目的:比较自制微创股骨近端系列接骨板与动力髋螺钉固定稳定型股骨转子间骨折后的生物力学性能.方法:采集干燥股骨标本,模拟AO分型 A1.3型稳定型股骨转子间骨折模型,分别采用自制微创股骨近端系列接骨板和动力髋螺钉内固定,然后在股骨近端内外侧皮质布置6枚电阻片,检测固定后的抗压、抗弯、抗剪和抗扭能力.结果与结论:股骨转子间骨折采用自制微创股骨近端系列接骨板固定后,股骨内、外侧强度比动力髋螺钉组固定强度高13%,内侧强度高16%,扭转强度高18%,扭转刚度高31%,差异有显著性意义(P < 0.05).可见自制微创股骨近端系列接骨板整体生物力学性能优于常规用动力髋螺钉,前者能十分有效对抗股骨抗拉、抗压、抗旋和内翻能力.
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