title: Stress analysis of glenoid component in design of reverse shoulder prosthesis using finite element method.
abstract: BACKGROUND
  This study aims to clarify the effect of various designs of reverse shoulder prosthesis (RSP) on stress variation of its glenoid component using 2-dimensional (2D) finite element analysis (FEA). This FEA study provides future reference for the optimal design of glenoid component of RSP.
  
  
  METHODS
  In this study, a 2D finite element (FE) model of human shoulder with implementation of RSP was developed by commercial FE software. The proper material properties were adopted in our model. Various design factors were simulated and all the mechanical profile data were investigated by FEA.
  
  
  RESULTS
  Both distal placement and increased lateral offset of glenosphere induce higher stress over glenoid-baseplate junction. Increased thickness of graft, inferiorly tilting of the baseplate, and adoption of BIO-RSA (bony increased-offset reverse shoulder arthroplasty) incur higher stresses over glenoid screws. The inferior screw attains more stress than superior screw. Maximum stress occurs at the base of inferior screw.
  
  
  CONCLUSIONS
  Increased eccentric offset and lateral offset of glenosphere, although being able to reduce notching, may pay the penalty of significant stress concentration over glenoid and its subsequent loosening. Maximum stress occurs at the base of inferior screw elucidate the direct contact failure mode at the middle of inferior screw. This study provides an alternative tool for the optimal design of glenoid component of RSP in the future.
authors: Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan.
authors: Ching-Chieh
authors: CC
authors: Yang
authors: Chun-Lin
authors: CL
authors: Lu
authors: Chun-Hung
authors: CH
authors: Wu
authors: Jiunn-Jer
authors: JJ
authors: Wu
authors: Teng-Le
authors: TL
authors: Huang
authors: Rongshun
authors: R
authors: Chen
authors: Meng-Kao
authors: MK
authors: Yeh
mesh_terms: D019643:Arthroplasty, Replacement / Q000295:instrumentation / Q000379:methods*; D001696:Biomechanical Phenomena; D001860:Bone Plates; D001863:Bone Screws; D020342:Finite Element Analysis; D006801:Humans; D007595:Joint Prosthesis; D008953:Models, Anatomic; D011474:Prosthesis Design; D012680:Sensitivity and Specificity; D012785:Shoulder Joint / Q000601:surgery*; D013314:Stress, Mechanical