摘要
目的 :评价压力侧骨皮质缺损时钢板内固定的即刻稳定程度 ,明确压力侧皮质骨块复位的重要性。方法 :6具新鲜股骨标本 ,于中段造成蝶形皮质缺损 ,测定正常股骨 ,单纯钢板内固定及对侧皮质骨块复位钢板内固定的垂直压缩、三点弯曲及抗扭转能力 ,比较不同固定方法在相同载荷下的位移。结果 :正常股骨在 5 0 0N垂直压力下的垂直位移 ,3 0 0N压力下的三点弯曲位移及 10N .m下的旋转角位移分别为 0 .82mm ,1.5 6mm和 0 .82° ,仅应用钢板于张力侧内固定后的三项位移分别为 8.2 9mm ,10 .5 9mm和9.11° ,应用钢板内固定对侧皮质骨块复位后分别为 1.78mm ,5 .15mm和 6.75° ,三项指标间均有非常显著性差异。结论 :当存在压力侧骨皮质缺损时 ,钢板固定骨块复位时的稳定性较单纯应用钢板内固定时好。应重视恢复钢板对侧皮质骨块的复位 ,恢复内侧的支撑力 。
Objective: To evaluate the intensity of the femoral diaphysis fracture while using a plate fixation, which own a bony defect on the opposite side of plate and to make sure of the importance of reduct contra lateral cortical fragment. Methods: Six femurs of fresh corpse were taken and made fracture with a buttress defect. The vertical compression, bending and torsion intensity in normal femur (team A), plate-fixated femur with or without reduction of the contra lateral cortical fragment (team C and team B) were measured. All results were analyzed with statistic method. Results: In team A the vertical displacement with 500 N load, bending displacement with 300 N load and angular displacement of rotation with 10 N·m were 0.82 mm, 1.56 mm and 0.82°(team B:8.29 mm, 10.59 mm,9.11°;team C:1.78 mm, 5.15 mm, 6.75°) respectively. The results showed an obvious statistical difference between three teams. The femur with plate fixation was stronger than the normal (vertical compression intensity: 10.28 times, bending intensity: 6.82 times; torsion intensity: 5.00 times). The plate-fixed femur with reduction of the contra lateral bony fragment was stronger than the team of bony defect (Vertical compression intensity:2022 times, bending intensity:3.30 times; torsion intensity: 3.76 times), especially the vertical compression. Conclusions: While using an internal fixation plate, in order to prevent the failure of fixation, it is necessary to reduce the contra lateral cortical fragment so as to recover the supporting intensity.
出处
《中国临床解剖学杂志》
CSCD
北大核心
2003年第6期624-626,共3页
Chinese Journal of Clinical Anatomy
关键词
压力侧
骨折
固定
生物力学
compression side
fracture
fixation
biomechanics
