title: Shape memory alloy smart knee spacer to enhance knee functionality: model design and finite element analysis.
abstract: In this paper we introduce Shape Memory Alloy (SMA) for designing the tibial part of Total Knee Arthroplasty (TKA) by exploiting the shape-memory and pseudo-elasticity property of the SMA (e.g. NiTi). This would eliminate the drawbacks of the state-of-the art PMMA based knee-spacer including fracture, sustainability, dislocation, tilting, translation and subluxation for tackling the Osteoarthritis especially for the aged people of 45-plus or the athletes. In this paper a Computer Aided Design (CAD) model using SolidWorks for the knee-spacer is presented based on the proposed SMA adopting the state-of-the art industry-standard geometry that is used in the PMMA based spacer design. Subsequently Ansys based Finite Element Analysis is carried out to measure and compare the performance between the proposed SMA based model with the state-of-the art PMMA ones. 81% more bending is noticed in the PMMA based spacer compared to the proposed SMA that would eventually cause fracture and tilting or translation of spacer. Permanent shape deformation of approximately 58.75% in PMMA based spacer is observed compared to recoverable 11% deformation in SMA when same load is applied on both separately.
authors.forename: Arvind
authors.initials: A
authors.lastname: Gautam
authors.forename: A Bhargavi
authors.initials: AB
authors.lastname: Rani
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Callejas
authors.forename: Swati Ghosh
authors.initials: SG
authors.lastname: Acharyya
authors.forename: Amit
authors.initials: A
authors.lastname: Acharyya
authors.forename: Dwaipayan
authors.initials: D
authors.lastname: Biswas
authors.forename: Vasundhra
authors.initials: V
authors.lastname: Bhandari
authors.forename: Paresh
authors.initials: P
authors.lastname: Sharma
authors.forename: Ganesh R
authors.initials: GR
authors.lastname: Naik
mesh_terms: D017076:Computer-Aided Design; D020342:Finite Element Analysis; D006801:Humans; D007719:Knee Joint / Q000502:physiology*; D007720:Knee Prosthesis; D009532:Nickel / Q000737:chemistry / Q000627:therapeutic use; D011474:Prosthesis Design / Q000379:methods*; D014025:Titanium / Q000737:chemistry / Q000627:therapeutic use
chemical_list: C040654:titanium nickelide; D009532:Nickel; D014025:Titanium