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Biomechanical Effects of the Geometry of Ball-and-Socket Artificial Disc on Lumbar Spine: A Finite Element Study

 Jisoo Choi  ;  Dong-Ah Shin  ;  Sohee Kim 
 Spine, Vol.42(6) : 332-339, 2017 
Journal Title
Issue Date
Biomechanical Phenomena/physiology* ; Finite Element Analysis ; Humans ; Intervertebral Disc/physiopathology* ; Intervertebral Disc/surgery ; Lumbar Vertebrae/surgery* ; Models, Anatomic ; Prostheses and Implants* ; Range of Motion, Articular/physiology* ; Spinal Fusion/methods ; Total Disc Replacement/methods ; Zygapophyseal Joint/surgery*
ball-and-socket artificial disc ; biomechanics ; degenerative disc disease ; facet contact force ; finite element analysis ; lumbar spine ; ProDisc ; radius of curvature ; range of motion ; total disc replacement
STUDY DESIGN: A three-dimensional finite element model of intact lumbar spine was constructed and four surgical finite element models implanted with ball-and-socket artificial discs with four different radii of curvature were compared. OBJECTIVE: To investigate biomechanical effects of the curvature of ball-and-socket artificial disc using finite element analysis. SUMMARY OF BACKGROUND DATA: Total disc replacement (TDR) has been accepted as an alternative treatment because of its advantages over spinal fusion methods in degenerative disc disease. However, the influence of the curvature of artificial ball-and-socket discs has not been fully understood. METHODS: Four surgical finite element models with different radii of curvature of ball-and-socket artificial discs were constructed. RESULTS: The range of motion (ROM) increased with decreasing radius of curvature in extension, flexion, and lateral bending, whereas it increased with increasing radius of curvature in axial torsion. The facet contact force was minimum with the largest radius of curvature in extension, flexion, and lateral bending, whereas it was maximum with the largest radius in axial torsion. It was also affected by the disc placement, more with posterior placement than anterior placement. The stress in L4 cancellous bone increased when the radius of curvature was too large or small. CONCLUSION: The geometry of ball-and-socket artificial disc significantly affects the ROM, facet contact force, and stress in the cancellous bone at the surgical level. The implication is that in performing TDR, the ball-and-socket design may not be ideal, as ROM and facet contact force are sensitive to the disc design, which may be exaggerated by the individual difference of anatomical geometry. LEVEL OF EVIDENCE: N/A.
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1. College of Medicine (의과대학) > Dept. of Neurosurgery (신경외과학교실) > 1. Journal Papers
Yonsei Authors
신동아(Shin, Dong Ah) ORCID logo https://orcid.org/0000-0002-5225-4083
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