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intramedullary stem
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  髓内柄
     Conclusion The intramedullary stem of the proximal femoral segmental prosthesis must have enough length to decrease the stress on the cement mantle in order to avoid the prosthesis loosening.
     对于股骨近段130mm的骨质缺损,采用髓内柄长为140mm骨水泥型股骨近段人工假体重建能够有效减少骨水泥层压力,从而避免因骨水泥发生疲劳碎裂而导致假体松动的危险。
短句来源
  “intramedullary stem”译为未确定词的双语例句
     Methods A retrospective study was carried out on 62 patients with the use of metal augmentation and intramedullary stem for uncontained bone defects (AORI type Ⅱ) in 227 revision total knee arthroplasties from 1992 to 2001. There were 28 male and 34 female with a mean age of 67.8 years (range, 42 to 87 years).
     方法对1992~2001年间227例全膝关节翻修术中使用金属垫片修复AORI-Ⅱ型非包容性骨缺损而获得随访的62例患者进行回顾性分析,男28例,女34例; 年龄42~87岁,平均67.8岁;
短句来源
     An experimental study on biomechanical effect of cemented intramedullary stem tip on bone torsional property at the level of femoral cortical screw holes
     髓内骨水泥柄对伴有骨缺损的长管状骨生物力学的影响
短句来源
     Objective To determine the effect of cemented intramedullary stem tip on bone torsional property at the level of femoral cortical screw holes.
     目的确定在股骨假体柄尾端位于股骨螺钉孔水平时对股骨干扭转力学特性的影响。
短句来源
  相似匹配句对
     (stem leaven).
     g(干曲)。
短句来源
     The stem and leaf of E.
     大戟茎叶对试鼠无毒杀作用。
短句来源
     Clinical Study of Treatment of Femoral Stem Shattered Fracture with Intramedullary Interlocking Nail
     带锁髓内钉治疗股骨干粉碎骨折的临床应用
短句来源
     Methods 55 cases of femoral stem shattered fracture were treated by intramedullary interlocking nail.
     方法 采用小切口切开复位 ,带锁髓内钉内固定治疗股骨干粉碎骨折 5 5例。
短句来源
     Spinal Intramedullary Cysts
     脊髓髓内囊肿
短句来源
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  intramedullary stem
The light microscopic appearance and caliber of the intramedullary stem motor axons of the intact MG motoneurons were indistinguishable from controls.
      
Although indications for the TPP are restricted to certain cases, unlike the conventional intramedullary stem, much can be expected of TPP.
      
Fractures at the distal tip of a well-fixed femoral prosthesis are difficult to stabilize with plates and screws because of the underlying intramedullary stem, polymethylmetacrylate (PMMA) cement, and thin periprosthetic femoral cortex.
      


Objective To explore the clinical results of the use of metal augmentation for uncon-tained bone defects in revision total knee arthroplasty. Methods A retrospective study was carried out on 62 patients with the use of metal augmentation and intramedullary stem for uncontained bone defects (AORI type Ⅱ) in 227 revision total knee arthroplasties from 1992 to 2001. There were 28 male and 34 female with a mean age of 67.8 years (range, 42 to 87 years). The diagnosis at the time of primary total knee arthroplasty...

Objective To explore the clinical results of the use of metal augmentation for uncon-tained bone defects in revision total knee arthroplasty. Methods A retrospective study was carried out on 62 patients with the use of metal augmentation and intramedullary stem for uncontained bone defects (AORI type Ⅱ) in 227 revision total knee arthroplasties from 1992 to 2001. There were 28 male and 34 female with a mean age of 67.8 years (range, 42 to 87 years). The diagnosis at the time of primary total knee arthroplasty was osteoarthritis in 51 (82.2%), rheumatoid arthritis in 8 (12.9%), lupus arthritis in 1 (1.6%) and posttrau-matic arthritis in 2 (3.2%). Revision was performed for aseptic loosening of femoral or tibial component in 30 (48.3%), reimplantation post- infection in 19 (30.6%), polyethylene wear with osteolysis in 3 (4.8%), malpo-sition or malalignment and instability in 10 (16.1%). Results Sixty-two patients were reviewed at a mean of 60.8 months (range, 13 to 132 months). Clinical evaluation revealed that the mean knee score of the knee society rating system had improved from 25 points preoperatively to 76 points postoperatively, the mean functional score from 40 points to 62 points at the latest follow-up and the mean range of motion ( had in-creased from a flexion arc of 78° to 87°. Radiolucent lines at the cement bone interface beneath the posteri-or femoral augmentation were present in 11 knees, beneath the medial tibial augmentation in 4 knees. None of radiolucent lines were progressive. All knees were asymptomatic. Two cases were failed due to recurrence of infection. One patient underwent for arthrodesis because of high risk for reinfection, another patient pre-ferred for resection arthroplasty and fused reimplantation. Post-operative manipulation under anesthesia for poor motion was carried out in 5 knees. Conclusion Metal augmentation for uncontained bone defects combined with intramedullary stem is feasible to accomplish, it provides immediate secure fixation to host bone, and improves success rate of revision knee arthroplasty, especially in elder patients.

目的探讨在全膝关节翻修术中采用金属垫片修复股骨及胫骨侧非包容性骨缺损的临床效果。方法对1992~2001年间227例全膝关节翻修术中使用金属垫片修复AORI-Ⅱ型非包容性骨缺损而获得随访的62例患者进行回顾性分析,男28例,女34例;年龄42~87岁,平均67.8岁;假体松动翻修30例,感染后假体二期植入19例,假体周围骨溶解3例,假体位置、下肢力线不佳或关节不稳定10例。采用金属垫片来修复骨缺损及恢复关节线水平,并使用髓内假体柄来增加翻修假体的稳定性。结果术后随访13~132个月,平均60.8个月。根据膝关节协会评分,膝评分从术前平均25分(15~60分)增加到随访时的平均76分(30~95分);功能评分从术前的40分(15~65分)增加到随访时的62分(25~90分);膝关节活动度从术前的78°(30°~100°)增加到随访时的87°(40°~130°)。2例感染后二期假体植入的病例由于感染复发而失败。11例股骨后侧、4例胫骨内侧可见金属垫片下骨水泥与骨界面有透亮带,但均未呈进行性发展。结论采用金属垫片修复全膝关节翻修术中非包容性骨缺损,尤其适用于老年患者,既可以方便手术操作,获得即刻稳定性,又可以提高翻...

目的探讨在全膝关节翻修术中采用金属垫片修复股骨及胫骨侧非包容性骨缺损的临床效果。方法对1992~2001年间227例全膝关节翻修术中使用金属垫片修复AORI-Ⅱ型非包容性骨缺损而获得随访的62例患者进行回顾性分析,男28例,女34例;年龄42~87岁,平均67.8岁;假体松动翻修30例,感染后假体二期植入19例,假体周围骨溶解3例,假体位置、下肢力线不佳或关节不稳定10例。采用金属垫片来修复骨缺损及恢复关节线水平,并使用髓内假体柄来增加翻修假体的稳定性。结果术后随访13~132个月,平均60.8个月。根据膝关节协会评分,膝评分从术前平均25分(15~60分)增加到随访时的平均76分(30~95分);功能评分从术前的40分(15~65分)增加到随访时的62分(25~90分);膝关节活动度从术前的78°(30°~100°)增加到随访时的87°(40°~130°)。2例感染后二期假体植入的病例由于感染复发而失败。11例股骨后侧、4例胫骨内侧可见金属垫片下骨水泥与骨界面有透亮带,但均未呈进行性发展。结论采用金属垫片修复全膝关节翻修术中非包容性骨缺损,尤其适用于老年患者,既可以方便手术操作,获得即刻稳定性,又可以提高翻修成功率。

Objectives To create three-dimensional finite element models for the large defect of proximal femur and the customized prosthesis of proximal segmental defect femur, and to analyze the influence on the stress distribution of femur-cement after the intramedullary implantation of different stem length prostheses. Methods Three-dimensional finite element models were established for the large defect of proximal femur and proximal femoral segmental prostheses with different stem-lengths (140 mm, 120 mm, 100 mm, 80...

Objectives To create three-dimensional finite element models for the large defect of proximal femur and the customized prosthesis of proximal segmental defect femur, and to analyze the influence on the stress distribution of femur-cement after the intramedullary implantation of different stem length prostheses. Methods Three-dimensional finite element models were established for the large defect of proximal femur and proximal femoral segmental prostheses with different stem-lengths (140 mm, 120 mm, 100 mm, 80 mm and 60 mm). The influence on stress distribution of femur-cement was analyzed for the different stem-length prostheses implanted. Results The stress on bone cement gradually increased from proximal end to distal end, and reached its highest value near the tip of prostheses. The prostheses with stem lengths of 120 mm, 100 mm, 80 mm and 60 mm could bring the cement mantle stress to the value beyond the fatigue strength of cement. Only when the intramedullary stem-length of prosthesis was 140 mm, the stress on the cement mantle was under the fatigue strength of cement. Conclusion The intramedullary stem of the proximal femoral segmental prosthesis must have enough length to decrease the stress on the cement mantle in order to avoid the prosthesis loosening.

目的建立股骨近段大段骨缺损及定制型股骨近段假体的三维有限元模型,分析不同柄长的股骨近段假体柄植入髓内后对股骨-骨水泥的应力分布的影响。方法通过CT扫描数据建立股骨近段130mm骨缺损不同髓内柄长度(140mm、120mm、100mm、80mm、60mm)的定制型假体的三维有限元模型。模拟下肢单足行走进行负荷加载,分析股骨-骨水泥的应力分布。结果骨水泥应力由近端向远端逐渐增加,在假体柄末端附近达到最大值。当髓内柄长度为140mm时,骨水泥层内、外侧最大应力值分别为2.5MPa和5.5MPa,均小于骨水泥自身强度,可以有效避免因高应力而导致骨水泥的碎裂。结论股骨近段假体髓内柄要有足够长度,以减少骨水泥所受应力,防止因骨水泥碎裂而出现假体松动。对于股骨近段130mm的骨质缺损,采用髓内柄长为140mm骨水泥型股骨近段人工假体重建能够有效减少骨水泥层压力,从而避免因骨水泥发生疲劳碎裂而导致假体松动的危险。

Objective To determine the effect of cemented intramedullary stem tip on bone torsional property at the level of femoral cortical screw holes. Methods Fifteen pairs of fresh frozen sheep femurs were divided into 3 equal groups. The right femurs were all subjected to a unicortical defect at the proximallateral side, and the left femurs served as intact bone. In Group A, only a defect of screw hole was made, 10% of the diaphyseal diameter in depth. In Group B, the intramedullary Mem tips were put at...

Objective To determine the effect of cemented intramedullary stem tip on bone torsional property at the level of femoral cortical screw holes. Methods Fifteen pairs of fresh frozen sheep femurs were divided into 3 equal groups. The right femurs were all subjected to a unicortical defect at the proximallateral side, and the left femurs served as intact bone. In Group A, only a defect of screw hole was made, 10% of the diaphyseal diameter in depth. In Group B, the intramedullary Mem tips were put at the level of the screw hole defect. In Group C, the intramedullary stem tips were put beyond the defect, with a length of double diaphyseal diameter. Another 5 pairs of fresh frozen sheep femurs worked as the control group. All specimens were tested in torsion to failure on the MTS biomechanical machine. Maximum torque at fracture (N·m) and maximum angular rotation at fracture (°) were recorded. Both single-tailed paired t-test and analysis of variance were used for data analysis (SPSS version 11.5). Results In Group A: maximum torque at fracture (N·m): left: 41. 10±8.16, right: 37. 95±8. 73; maximum angular rotation at fracture (°): left: 13. 62±0.82, right: 13.31±1.74. In Group B: maximum torque at fracture (N·m): left: 44. 49±9. 93, right: 43. 98±6. 00: maximum angular rotation at fracture (°): left: 11. 08±1.30, right: 11.23±0.83. In Group C: maximum torque at fracture (N·m): left: 43. 83±7. 62, right: 41. 58±12. 94; maximum angular rotation at fracture (°): left: 12. 35±1. 27, right: 13. 08±5. 56. In the control group: maximum torque at fracture (N·m): left: 39. 56±24.64, right: 33. 59±18. 47; maximum angular rotation at fracture (°): left: 14. 84±5. 42, right: 11.80±3. 04. There were no statistical differences between the right and the left femurs in each group. Conclusion The intramedullary stem tip put at the level of a cortical bone defect of screw hole(l0% of diaphyseal diameter) does not weaken bone torsional property of the femur.

目的确定在股骨假体柄尾端位于股骨螺钉孔水平时对股骨干扭转力学特性的影响。方法将配对的15对新鲜冷冻羊股骨随机分为三组,每组5对,在每只右侧股骨的近端外侧制作出单皮质的骨缺损(10%股骨干直径),左侧为完整骨。A组为制作出骨皮质螺钉孔后,股骨髓内不放置假体柄;B组为股骨假体柄尾端位于骨缺损水平;C组为股骨假体柄尾端位于骨缺损远端2倍股骨干直径处。将股骨两端固定在力学机上,近端内旋1°/s直至骨折,记录最大扭矩及最大旋转角度。配对t检验计算出各配对骨间是否有统计学差异,另外将5对完整骨作为对照组。结果A组最大扭矩:左侧(41.10±8.16)N·m,右侧(37.95±8.73)N·m;最大旋转角度:左侧13.62°±0.82°,右侧13.31°±1.74°。B组最大扭矩:左侧(44.49±9.93)N·m,右侧(43.98±6.00)N·m;最大旋转角度:左侧11.08°±1.30°,右侧11.23°±0.83°。C组最大扭矩:左侧(43.83±7.62)N·m,右侧(41.58±12.94) N·m;最大旋转角度:左侧12.35°±1.27°,右侧13.08°±5.56°。对照组最大扭矩:左侧(39.56±24...

目的确定在股骨假体柄尾端位于股骨螺钉孔水平时对股骨干扭转力学特性的影响。方法将配对的15对新鲜冷冻羊股骨随机分为三组,每组5对,在每只右侧股骨的近端外侧制作出单皮质的骨缺损(10%股骨干直径),左侧为完整骨。A组为制作出骨皮质螺钉孔后,股骨髓内不放置假体柄;B组为股骨假体柄尾端位于骨缺损水平;C组为股骨假体柄尾端位于骨缺损远端2倍股骨干直径处。将股骨两端固定在力学机上,近端内旋1°/s直至骨折,记录最大扭矩及最大旋转角度。配对t检验计算出各配对骨间是否有统计学差异,另外将5对完整骨作为对照组。结果A组最大扭矩:左侧(41.10±8.16)N·m,右侧(37.95±8.73)N·m;最大旋转角度:左侧13.62°±0.82°,右侧13.31°±1.74°。B组最大扭矩:左侧(44.49±9.93)N·m,右侧(43.98±6.00)N·m;最大旋转角度:左侧11.08°±1.30°,右侧11.23°±0.83°。C组最大扭矩:左侧(43.83±7.62)N·m,右侧(41.58±12.94) N·m;最大旋转角度:左侧12.35°±1.27°,右侧13.08°±5.56°。对照组最大扭矩:左侧(39.56±24.64)N·m,右侧(33.59±18.47)N·m;最大旋转角度:左侧14.84°±5.42°,右侧11.80°±3.04°。左右两侧对比差异均无统计学意义(P>0.05)。结论股骨柄尾端位于螺钉孔水平不降低股骨干的最大扭转力。

 
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