Your browser doesn't support javascript.
loading
The effect of humeral implant thickness and canal fill on interface contact and bone stresses in the proximal humerus.
Synnott, Stephanie; Langohr, G Daniel G; Reeves, Jacob M; Johnson, James A; Athwal, George S.
Afiliación
  • Synnott S; Roth|McFarlane Hand and Upper Limb Center Biomechanics Laboratory, London, ON, Canada.
  • Langohr GDG; Roth|McFarlane Hand and Upper Limb Center Biomechanics Laboratory, London, ON, Canada.
  • Reeves JM; Roth|McFarlane Hand and Upper Limb Center Biomechanics Laboratory, London, ON, Canada.
  • Johnson JA; Roth|McFarlane Hand and Upper Limb Center Biomechanics Laboratory, London, ON, Canada.
  • Athwal GS; Roth|McFarlane Hand and Upper Limb Center Biomechanics Laboratory, London, ON, Canada.
JSES Int ; 5(5): 881-888, 2021 Sep.
Article en En | MEDLINE | ID: mdl-34505100
BACKGROUND: Stem size is an important element for successful time zero primary fixation of a press-fit humeral stem in shoulder arthroplasty. Little basic science research, however, has been conducted on the effects of implant thickness and canal fill on load transfer, contact, and stress shielding. The purpose of this finite element study was to determine the effects of varying stem thickness on bone contact, bone stresses, and bone resorption owing to stress shielding. METHODS: Three generic short-stem implant models were developed and varied based on cross-sectional thickness (thinner - 8 mm, medium - 12 mm, thicker - 16 mm). Using a finite element model, three outcome measures were determined (1) the amount of bone-to-implant contact, (2) changes in cortical and trabecular bone stresses from the intact state, and (3) changes in cortical and trabecular strain energy densities which can predict bone remodeling or stress shielding. RESULTS: Increasing the size of the humeral stem had no significant effects on bone-to-implant contact during loading (P > .07). The thinner implant with the lowest canal fill ratio produced significantly lower changes in stress from the intact state in both cortical and trabecular bone (P < .002). In addition, the thinner implant resulted in a substantially lower volume of bone predicted to stress shield and resorb when compared with the medium and thicker stems. DISCUSSION: The results demonstrate that thinner implants and lower canal fill may be beneficial over thicker sizes, provided equal initial fixation can be achieved. The thinner implant has a greater degree of load sharing and increases the mechanical load placed on surrounding bone, reducing the risk of stress shielding and bone resorption.
Palabras clave
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: JSES Int Año: 2021 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: JSES Int Año: 2021 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Estados Unidos