Experimental Study on Biomaterial Mechanical Characteristics of Knee Cruciate Ligament

Objective:Conduct experimental mechanical biomaterials study on the knee cruciate ligament.Provide basis for the analysis of injury mechanism,prevention,and materials replacement after injury.Methods:Take 24 anterior ACL and posterior PCL ligaments of non-lesions knees from adult males of age from 25 to 35.Divide ACL into AMB and PLB,PCL into ALB and PMB.Prepare standard testing pieces by frozen sections.Conduct Vera stretch tests and Stress relaxation tests and make comparison of different parts of ACL and PCL Results:1) There is no significant difference within different parts of the ACL and PCL.2) For the relaxation rate within 1 second,PMB has the maximum value,followed by PLB,ALB and AMB;For the relaxation rate within 100 seconds,PMB has the maximum value,followed by PLB,AMB and ALB.The comparison results are significantly different(P<0.01).3) When the stretch reaches 2%,the significant difference for AMB is greater than that of PLB(P<0.05);When it reaches 4%,the significant difference for ALB is greater than that of AMB(P<0.05);the significant difference for ALB is greater than that of PLB(P<0.01);When it reaches 6% and 8%,the significant difference for ALB is greater than that of AMB(P<0.05).4) Comparison of the tensile stiffness,the elastic modulus and the fracture stress for each part of ACL and PCL does not show significant difference(P> 0.05).Conclusion:1) There is no significant difference in the biomechanical characteristics for ACL and PCL of human knee cruciate.2) The viscoelasticity is relatively large,and the buckling and stretching ability is relatively strong for PMB and PLB.3) In the initial stage of tensile,the AMB shows strong response to the external load;With increase of the stretched length,the load response of ALB increases gradually.4) In the range of physiological stress,there is no significant differences in the tensile stiffness for ACL and PClL.