BACKGROUND High tibial osteotomy(HTO)is a well-known procedure for the correction of knee varus.The purpose of this study was to compare the radiological results and accuracy of deformity correction performed using tw...BACKGROUND High tibial osteotomy(HTO)is a well-known procedure for the correction of knee varus.The purpose of this study was to compare the radiological results and accuracy of deformity correction performed using two different techniques:acute opening wedge correction using a plate and gradual correction with a monolateral external fixator.AIM To compare of the radiological results of two different techniques:acute opening wedge correction(a plate and screw)and gradual correction(external fixator).METHODS A total of 43 patients with plates and 36 patients with external fixators were included.All patients had moderate uniplanar varus deformities.We measured radiographic parameters,including the mechanical axis deviation(MAD),medial proximal tibial angle(MPTA),Caton-Deschamps Index(CDI),posterior proximal tibial angle,and joint line obliquity angle(JLOA).The accuracy of MAD correction was calculated based on a correction goal of neutral or overcorrection for medial compartment arthritis.RESULTS Demographics including age,body mass index,sex,and preoperative deformities were similar between the groups.The MAD significantly improved from 23.6 mm medial to the midline(SD=8.2 mm)to 6.9 mm lateral to the midline(SD=5.4 mm)(P<0.001).The accuracy of MAD correction did not differ between the groups and was 96.1%(SD=8.1%)in the plate group and 98.2%(SD=5.2%)in the external fixator group(P=0.18).The MPTA significantly improved from 83.9°(SD=2.9°)to 90.9°(SD=3.3°)(P<0.001),and the change was similar between the groups.Differences were noted in patella height,with a CDI change of-19.2%(SD=13.7%)and 3.1%(SD=8.0%)for the plate and external fixator groups,respectively(P<0.001).The change in JLOA was 1.6 degrees(SD=1.1 degrees)and 0.9 degrees(SD=0.9 degrees)for the plate and external fixator groups,respectively(P=0.04).CONCLUSION Reliable correction of moderate varus alignment was achieved with both the acute opening wedge technique with a plate and the gradual monolateral external fixator technique.The patellar height decreased with the open wedge plate technique.Joint line obliquity decreased to a greater degree with the open wedge plate technique,perhaps as a result of medial collateral ligament release.The appropriate technique should be selected based on surgeon and patient preferences;however,external fixation may be a better choice when the preservation of patellar height is deemed important.展开更多
The treatment of pathological fractures of the femoral neck and trochanteric region secondary to benignlesions can be a challenge for orthopaedic surgeons because of the size and nature of the lesions, the resulting ...The treatment of pathological fractures of the femoral neck and trochanteric region secondary to benignlesions can be a challenge for orthopaedic surgeons because of the size and nature of the lesions, the resulting bony defect, the risk of recurrence, the possible associated deformities, and the risk of osteonecrosis. Numerous treatment modalities have been reported for the management of pathological fractures of the proximal femur secondary to benign lesions. An unsatisfactory outcome in 25% of patients and a complication rate of 45% have been observed.展开更多
目的采用三维有限元数值模拟方法分析比较骨水泥棒外固定支架与交叉克氏针在力学稳定性方面的差异,为手术治疗第五掌骨颈骨折(特别是第五掌骨颈开放性骨折)提供理论依据。方法选取1名健康志愿者,采集其手腕关节的三维CT图像数据,首先利...目的采用三维有限元数值模拟方法分析比较骨水泥棒外固定支架与交叉克氏针在力学稳定性方面的差异,为手术治疗第五掌骨颈骨折(特别是第五掌骨颈开放性骨折)提供理论依据。方法选取1名健康志愿者,采集其手腕关节的三维CT图像数据,首先利用Mimics Research 21.0、Geomagic Studio 2021软件进行三维图形数据处理,在此基础上应用Solidworks 2020软件构建第五掌骨颈骨折骨水泥棒外固定支架模型(A模型)和第五掌骨颈骨折交叉克氏针固定模型(B模型)。在ANSYS Workbench 17.0中对各模型的材料属性进行赋值、划分网格,建立三维有限元模型。最后通过在第五掌骨头远端关节面进行轴向施加和第五掌骨三点弯曲实验,计算得出两种施压方式的远端骨折块的最大位移,以此评价骨水泥棒外固定支架治疗第五掌骨颈骨折的稳定性。结果(1)轴向施压时,A模型远端骨折块的最大位移、最小位移和平均位移的值大于B模型,A模型近端骨折块的最大位移、最小位移和平均位移的值小于B模型,A模型最大相对位移、最小相对位移和平均相对位移大于B模型。(2)在三点折弯给力时,A模型远端骨折块最大位移小于B模型,远端骨折块最小位移等于B模型,近端骨折块的最大位移和最小位移的均值大于B模型,A模型最大相对位移、最小相对位移和平均相对位移大于B模型。(3)与B模型相比较,A模型的总体应力、固定物应力均明显较小。结论骨水泥棒外固定支架及克氏针交叉固定在治疗第五掌骨颈骨折方面,在轴向和纵向上的位移及总位移均未超过1 mm,差异较小;但骨水泥棒外固定支架在两种施力方式中与交叉克氏针相比应力更小,提示骨水泥棒外固定支架能提供可靠的力学稳定性。展开更多
文摘BACKGROUND High tibial osteotomy(HTO)is a well-known procedure for the correction of knee varus.The purpose of this study was to compare the radiological results and accuracy of deformity correction performed using two different techniques:acute opening wedge correction using a plate and gradual correction with a monolateral external fixator.AIM To compare of the radiological results of two different techniques:acute opening wedge correction(a plate and screw)and gradual correction(external fixator).METHODS A total of 43 patients with plates and 36 patients with external fixators were included.All patients had moderate uniplanar varus deformities.We measured radiographic parameters,including the mechanical axis deviation(MAD),medial proximal tibial angle(MPTA),Caton-Deschamps Index(CDI),posterior proximal tibial angle,and joint line obliquity angle(JLOA).The accuracy of MAD correction was calculated based on a correction goal of neutral or overcorrection for medial compartment arthritis.RESULTS Demographics including age,body mass index,sex,and preoperative deformities were similar between the groups.The MAD significantly improved from 23.6 mm medial to the midline(SD=8.2 mm)to 6.9 mm lateral to the midline(SD=5.4 mm)(P<0.001).The accuracy of MAD correction did not differ between the groups and was 96.1%(SD=8.1%)in the plate group and 98.2%(SD=5.2%)in the external fixator group(P=0.18).The MPTA significantly improved from 83.9°(SD=2.9°)to 90.9°(SD=3.3°)(P<0.001),and the change was similar between the groups.Differences were noted in patella height,with a CDI change of-19.2%(SD=13.7%)and 3.1%(SD=8.0%)for the plate and external fixator groups,respectively(P<0.001).The change in JLOA was 1.6 degrees(SD=1.1 degrees)and 0.9 degrees(SD=0.9 degrees)for the plate and external fixator groups,respectively(P=0.04).CONCLUSION Reliable correction of moderate varus alignment was achieved with both the acute opening wedge technique with a plate and the gradual monolateral external fixator technique.The patellar height decreased with the open wedge plate technique.Joint line obliquity decreased to a greater degree with the open wedge plate technique,perhaps as a result of medial collateral ligament release.The appropriate technique should be selected based on surgeon and patient preferences;however,external fixation may be a better choice when the preservation of patellar height is deemed important.
文摘The treatment of pathological fractures of the femoral neck and trochanteric region secondary to benignlesions can be a challenge for orthopaedic surgeons because of the size and nature of the lesions, the resulting bony defect, the risk of recurrence, the possible associated deformities, and the risk of osteonecrosis. Numerous treatment modalities have been reported for the management of pathological fractures of the proximal femur secondary to benign lesions. An unsatisfactory outcome in 25% of patients and a complication rate of 45% have been observed.
文摘目的采用三维有限元数值模拟方法分析比较骨水泥棒外固定支架与交叉克氏针在力学稳定性方面的差异,为手术治疗第五掌骨颈骨折(特别是第五掌骨颈开放性骨折)提供理论依据。方法选取1名健康志愿者,采集其手腕关节的三维CT图像数据,首先利用Mimics Research 21.0、Geomagic Studio 2021软件进行三维图形数据处理,在此基础上应用Solidworks 2020软件构建第五掌骨颈骨折骨水泥棒外固定支架模型(A模型)和第五掌骨颈骨折交叉克氏针固定模型(B模型)。在ANSYS Workbench 17.0中对各模型的材料属性进行赋值、划分网格,建立三维有限元模型。最后通过在第五掌骨头远端关节面进行轴向施加和第五掌骨三点弯曲实验,计算得出两种施压方式的远端骨折块的最大位移,以此评价骨水泥棒外固定支架治疗第五掌骨颈骨折的稳定性。结果(1)轴向施压时,A模型远端骨折块的最大位移、最小位移和平均位移的值大于B模型,A模型近端骨折块的最大位移、最小位移和平均位移的值小于B模型,A模型最大相对位移、最小相对位移和平均相对位移大于B模型。(2)在三点折弯给力时,A模型远端骨折块最大位移小于B模型,远端骨折块最小位移等于B模型,近端骨折块的最大位移和最小位移的均值大于B模型,A模型最大相对位移、最小相对位移和平均相对位移大于B模型。(3)与B模型相比较,A模型的总体应力、固定物应力均明显较小。结论骨水泥棒外固定支架及克氏针交叉固定在治疗第五掌骨颈骨折方面,在轴向和纵向上的位移及总位移均未超过1 mm,差异较小;但骨水泥棒外固定支架在两种施力方式中与交叉克氏针相比应力更小,提示骨水泥棒外固定支架能提供可靠的力学稳定性。
