后交叉韧带断裂对股骨内侧髁生物力学特征的影响。
Effect of posterior cruciate ligament rupture on biomechanical features of the medial femoral condyle.
机构信息
Department of Orthopaedics, Xiangya Hospital, Central South University, or Orthopaedics Institute of Central South University, Changsha, Hunan, China.
出版信息
Orthop Surg. 2011 Aug;3(3):205-10. doi: 10.1111/j.1757-7861.2011.00138.x.
OBJECTIVE
To investigate the biomechanical impact of rupture of the posterior cruciate ligament (PCL) and its various bundles on the medial femoral condyle.
METHODS
Twelve fresh human cadaveric knee specimens were divided into four groups: PCL intact, anterolateral band (ALB) rupture, posteromedial band (PMB) rupture and PCL complete rupture groups according to the purpose and order of testing. Strain in the middle of the medial femoral condyle was measured under different loads (200-800N) at 0°, 30°, 60°, and 90° of knee flexion.
RESULTS
At 0° of knee flexion, compared with the PCL intact and ALB rupture groups, strain on the medial femoral condyle increased in the PMB rupture and PCL complete rupture groups under all loading conditions. There was no statistical difference between the PMB rupture and PCL complete rupture groups. At 30°, 60° and 90° of knee flexion, compared with the PCL intact group, increase in strain on the medial femoral condyle was noted in the ALB rupture group under higher loading conditions (600N and 800N) and PCL complete rupture group under all loading conditions. The PCL complete rupture group had higher strain on the medial femoral condyle than did the ALB rupture group under most loading conditions.
CONCLUSION
At 0° of knee flexion, PMB rupture or PCL complete rupture can cause increase in strain on the medial femoral condyle. However, at 30°, 60° and 90° of knee flexion, ALB rupture or PCL complete rupture can cause increase in strain on the medial femoral condyle.
目的
研究后交叉韧带（PCL）及其各束破裂对股骨内侧髁的生物力学影响。
方法
将 12 个新鲜的人体尸体膝关节标本根据测试目的和顺序分为四组：PCL 完整组、前外侧束（ALB）破裂组、后内侧束（PMB）破裂组和 PCL 完全破裂组。在膝关节 0°、30°、60°和 90°不同负荷（200-800N）下测量股骨内侧髁中部的应变。
结果
在膝关节 0°时，与 PCL 完整组和 ALB 破裂组相比，在所有加载条件下，PMB 破裂组和 PCL 完全破裂组的股骨内侧髁应变均增加。PMB 破裂组和 PCL 完全破裂组之间无统计学差异。在膝关节 30°、60°和 90°时，与 PCL 完整组相比，在较高的加载条件（600N 和 800N）下，ALB 破裂组和所有加载条件下的 PCL 完全破裂组的股骨内侧髁应变均增加。在大多数加载条件下，PCL 完全破裂组的股骨内侧髁应变均高于 ALB 破裂组。
结论
在膝关节 0°时，PMB 破裂或 PCL 完全破裂均可导致股骨内侧髁应变增加。然而，在膝关节 30°、60°和 90°时，ALB 破裂或 PCL 完全破裂均可导致股骨内侧髁应变增加。
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