Experimental investigation of the tension band in fractures of the patella
Experimental investigation of the tension band in fractures of the patella
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DOI：
10.1016/s0020-1383(01)00173-5
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发表时间：
2002-07-01
影响因子：
2.5
通讯作者：
Boudouris, T
中科院分区：
文献类型：
--
作者：
Fortis, AP;Milis, Z;Boudouris, T
我们研究了膝关节运动过程中固定髌骨前后部分的应变模式。使用了8个新鲜尸体膝关节，但由于量规错位导致测量不可靠，因此排除了2个。两个应变片分别粘在髌骨前表面和后表面的中线上。将螺纹钢棒用骨水泥固定在股骨和胫骨髓内管中。膝盖被放在一个特殊的装置上。夹紧股四头肌肌腱，将4.5 kg砝码连接到关节线远端16.5 cm处的胫骨棒上。测试前进行了10次屈曲/伸展循环。最初对完整髌骨进行测试。在通过AO推荐的张力带技术进行稳定之前，进行了横向截骨术。如上所述，再次对膝关节进行测试。最后，将另一根环形导丝穿过髌骨，并在相同的载荷配置下再次对膝关节进行测试。完整的髌骨在整个膝关节活动范围内，前表面表现出弱的拉伸应变，后表面表现出弱的压缩应变。张力带固定在前几个屈曲度产生弱拉伸应变，然后在后表面产生弱压缩应变。额外的圆形线的存在下显着增加的压缩应变。经典张力带对于髌骨骨折的固定是非常有效的，但通过额外的环形钢丝进行了改进。(C)2002爱思唯尔科技有限公司版权所有。
We investigated the strain pattern developed in the anterior and posterior part of the fixed patella during knee motion. Eight fresh cadaver knees were used but two were excluded because of non reliable measurements due to misplacement of gauges. Two strain gauges were bonded in the midline of the anterior and two in the posterior surface of the patella. Threaded steel rods were cemented into the intramedullary femoral and tibial canals. The knee was placed on a special device. The quadriceps tendon was gripped and a 4.5 kg weight was attached to the tibial rod 16.5 cm distal to the joint line. Ten flexion/extension cycles were performed before testing. Initially the intact patella was tested. A transverse osteotomy was performed before being stabilized by the AO recommended tension band technique. The knee was retested again as above. Finally an additional circular wire was passed around the patella and the knee was tested again under the same loading configuration. The intact patella showed weak tensile strain on the anterior and compressive strain on the posterior surface through the range of knee motion. Tension band fixation produced weak tensile strains in the first few, degrees of flexion and then weak compressive strains in the posterior surface. The presence of the additional circular wire significantly increased the compressive strain. The classical tension band is highly effective for the fixation of the fracture patella but is improved by an additional circular wire. (C) 2002 Elsevier Science Ltd. All rights reserved.