The Finite Element Analysis Of Lumbar Percutaneous Endoscopic Bilateral Foraminoplasty

Objective:To analyze the effects of lumbar percutaneous endoscopic bilateral foraminoplasty on Biomechanical parameters of lumbar vertebra using finite-element analysis.Methods:CT imaging data of Lumbar vertebra of a healthy male subject were obtained to establish a three-dimension finite element model of L4-5.Then lumbar percutaneous endoscopic bilateral foraminoplasty was simulated on the model,with trephine replaced by a cylinder.Effects of the surgery on 6 motion state of L4-5 were evaluated.Results:Movement range of L4-5 became larger in antexion,rear protraction,lateral bending and rotation,while the stress of intervertebral disc increased in antexion,rear protraction and lateral bending,and in lateral bending,the stress increased the most.Conclusion:Effects of lumbar percutaneous endoscopic bilateral foraminoplasty on L4-5depends on the motion state,and the change of movement range of L4-5 is antexion >lateral bending > rotation > rear protraction,while the change of intervertebral disc is lateral bending > antexion > rotation > rear protraction.