目的探讨前交叉韧带(ACL)胫骨髁间棘撕脱骨折3种内固定方式的生物力学性能比较。方法取防腐成人膝关节标本15具,随机分为三组,每组5具,标本制作成ACL胫骨髁间棘撕脱骨折后不同内固定方式模型,分别为:缝线组、缝线结合空心钉组、空心钉...目的探讨前交叉韧带(ACL)胫骨髁间棘撕脱骨折3种内固定方式的生物力学性能比较。方法取防腐成人膝关节标本15具,随机分为三组,每组5具,标本制作成ACL胫骨髁间棘撕脱骨折后不同内固定方式模型,分别为:缝线组、缝线结合空心钉组、空心钉组。每具标本分别在MTS-858材料测试系统进行屈曲30°加载60、90、120、150 N正常、术后及疲劳后测试,模拟Lachman试验。实验过程中三维激光扫描仪从不同角度自动捕捉膝关节运动变化,采集实验数据,用geomagic studio 5.0软件处理。结果不同应力及不同状态下三组间ACL长度比较差异有统计学意义(P<0.05),且缝线结合空心钉组固定效果最好,平均位移(3.53±0.24)mm,空心钉组次之,平均位移(4.63±0.37)mm,缝线组效果最差,平均位移(5.75±0.53)mm。结论胫骨髁间棘撕脱骨折三种内固定方式中缝线结合空心钉内固定效果最好,空心钉内固定次之,缝线内固定效果最差。展开更多
BACKGROUND The purpose of open reduction and internal fixation of acetabulum posterior wall fractures is to restore anatomical structure and stability of the hip joint, in order to start weight bearing as soon as poss...BACKGROUND The purpose of open reduction and internal fixation of acetabulum posterior wall fractures is to restore anatomical structure and stability of the hip joint, in order to start weight bearing as soon as possible and prevent hip arthrosis; restoration of the anatomy should preserve function of the joint as well. Although "special shaped precontoured plates" have been developed in recent years for surgical treatment of this region, studies comparing the traditional plates with the newly designed precontoured plates are lacking.AIM To evaluate the biomechanical properties of precontoured anatomic buttress and conventional curved reconstruction plates(CCRPs) for posterior wall acetabulum fracture treatment.METHODS Twelve pelvis models were created for testing plate treatment of fracture in the posterior wall of the acetabulum. These 12 pelvis models were used to create 24 hemipelvis models(experimental) by cutting from the sagittal plane and passing over the center of gravity, after which the posterior wall acetabular fractures(of similar type and size) were created. In these experimental models, the right acetabulum was fixed with a 5-hole CCRP, while the left was fixed with a precontoured anatomic buttress plate(PABP). Samples were placed through thetest device and were subjected to static load testing, with a constant testing velocity of 2 mm/min until the load reached 2.3 kN or the acetabular fixation failed. Dynamic tests were also performed with sinusoidal wave load, with a maximal load of 2.3 kN and a load ratio of 0.1.RESULTS The average stiffness values were 460.83 ± 95.47 N/mm for the PABP and 291.99± 118.58 N/mm for the 5-hole CCRP. The precontoured anatomic acetabulum buttress plates had significantly higher rigidity than the CCRPs(P = 0.022). There was a statistically significant difference between the unloaded and 2.3 kN-loaded values of AL(posterosuperior fracture line vertical to the ground surface) and CL(posteroinferior fracture line vertical to the ground surface) parameters for both th展开更多
文摘目的探讨前交叉韧带(ACL)胫骨髁间棘撕脱骨折3种内固定方式的生物力学性能比较。方法取防腐成人膝关节标本15具,随机分为三组,每组5具,标本制作成ACL胫骨髁间棘撕脱骨折后不同内固定方式模型,分别为:缝线组、缝线结合空心钉组、空心钉组。每具标本分别在MTS-858材料测试系统进行屈曲30°加载60、90、120、150 N正常、术后及疲劳后测试,模拟Lachman试验。实验过程中三维激光扫描仪从不同角度自动捕捉膝关节运动变化,采集实验数据,用geomagic studio 5.0软件处理。结果不同应力及不同状态下三组间ACL长度比较差异有统计学意义(P<0.05),且缝线结合空心钉组固定效果最好,平均位移(3.53±0.24)mm,空心钉组次之,平均位移(4.63±0.37)mm,缝线组效果最差,平均位移(5.75±0.53)mm。结论胫骨髁间棘撕脱骨折三种内固定方式中缝线结合空心钉内固定效果最好,空心钉内固定次之,缝线内固定效果最差。
文摘BACKGROUND The purpose of open reduction and internal fixation of acetabulum posterior wall fractures is to restore anatomical structure and stability of the hip joint, in order to start weight bearing as soon as possible and prevent hip arthrosis; restoration of the anatomy should preserve function of the joint as well. Although "special shaped precontoured plates" have been developed in recent years for surgical treatment of this region, studies comparing the traditional plates with the newly designed precontoured plates are lacking.AIM To evaluate the biomechanical properties of precontoured anatomic buttress and conventional curved reconstruction plates(CCRPs) for posterior wall acetabulum fracture treatment.METHODS Twelve pelvis models were created for testing plate treatment of fracture in the posterior wall of the acetabulum. These 12 pelvis models were used to create 24 hemipelvis models(experimental) by cutting from the sagittal plane and passing over the center of gravity, after which the posterior wall acetabular fractures(of similar type and size) were created. In these experimental models, the right acetabulum was fixed with a 5-hole CCRP, while the left was fixed with a precontoured anatomic buttress plate(PABP). Samples were placed through thetest device and were subjected to static load testing, with a constant testing velocity of 2 mm/min until the load reached 2.3 kN or the acetabular fixation failed. Dynamic tests were also performed with sinusoidal wave load, with a maximal load of 2.3 kN and a load ratio of 0.1.RESULTS The average stiffness values were 460.83 ± 95.47 N/mm for the PABP and 291.99± 118.58 N/mm for the 5-hole CCRP. The precontoured anatomic acetabulum buttress plates had significantly higher rigidity than the CCRPs(P = 0.022). There was a statistically significant difference between the unloaded and 2.3 kN-loaded values of AL(posterosuperior fracture line vertical to the ground surface) and CL(posteroinferior fracture line vertical to the ground surface) parameters for both th
