| 摘要: |
| 目的建立一种模拟髋臼后壁缺损的动物模型,评价不同后壁重建方法对髋臼与股骨头间接触特性的影响。方法获取6具新鲜成年家犬骨盆股骨标本,采用后壁截骨法建立髋臼后壁60°弧1/2缺损的动物标本模型；两侧缺损区分别选用不同的重建方法,采用压敏片检测不同状态下头臼接触面积及接触应力。结果与完整髋臼相比,后壁重建使头臼接触面积有所减少；在250 N载荷下,解剖重建组头臼接触面积与普通重建组比较差异无统计学意义；其平均接触应力小于普通重建组(P<0.05),说明解剖重建组应力集中小于普通重建组。结论后壁截骨法建立的犬髋臼后壁缺损模型可有效模拟临床实际；解剖重建使后壁头臼接触面积及应力分布恢复比较理想,接近正常髋关节,避免了局部应力集中。 |
| 关键词: 髋臼 骨缺损 骨移植 生物力学 |
| DOI：10.3724/SP.J.1008.2010.0775 |
| 投稿时间：2009-11-20修订日期：2010-04-05 |
| 基金项目: |
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| Development of a reconstructive posterior acetabular defect model in dogs and related biomechanical research |
| ZHANG Peng1, XU Shuo-gui2*, ZHANG Chun-cai2, NIU Yun-fei2, FU Qing-ge2,XU Shuo-gui |
| (1.Department of Orthopaedics, Provincial Hospital Affiliated to Shandong University, Jinan 250021, Shandong, China; 2.Department of Orthopaedics, Changhai Hospital, Second Military Medical University, Shanghai 200433, China) |
| Abstract: |
| ObjectiveTo construct a model of posterior acetabular defect and evaluate the effect of the reconstructive posterior wall on the contact of the acetabulum and femoral head.MethodsThe entire pelvis and articulated femur were obtained from six fresh adult canine cadavers.Animal models of posterior acetabular defects were developed by removing the 60° arc fragment.Different measures were used to reconstruct the defect areas with iliac crest autograft.The pressure-sensitive films were used to calculate the contact area, the mean pressure and the distribution of the pressure between the acetabulum and femoral head.ResultsThe contact area was smaller after reconstruction of posterior wall compared with that of intact posterior wall.The contact areas were not significantly different between the common reconstruction group and the anatomic reconstruction group under a load of 250 N (P>0.05).The mean contact stress of the anatomic reconstruction group was significantly less than that of the common reconstruction group (P<0.05), indicating the collection of pressure was less than that of the common reconstruction group.ConclusionAnimal models of posterior acetabular defects induced by posterior wall osteotomy can effectively mimic the clinical condition; the anatomic reconstruction of the posterior wall can restore the total contact area and the distribution of the pressure within the acetabulum similar to the normal condition. |
| Key words: acetabulum bone defect bone transplantion biomechanics |
