PMID- 37070137
OWN - NLM
STAT- MEDLINE
DCOM- 20230608
LR  - 20230608
IS  - 1724-6040 (Electronic)
IS  - 0391-3988 (Linking)
VI  - 46
IP  - 6
DP  - 2023 Jun
TI  - Study of cellular femoral stem for stress shielding and interface stability.
PG  - 370-377
LID - 10.1177/03913988231168158 [doi]
AB  - Implant failure is due to stress shielding and interface micromotion. The 
      application of porous structures in the femoral implant has a great effect on 
      reducing stress shielding and improving the stability of the bone-implant 
      interface. The performance of femoral stems with triply periodic minimal surface 
      (TPMS) structures, IWP, and Gyroid structures was evaluated using finite element 
      analysis. We studied the stress shielding phenomenon of the porous femoral stem 
      based on the ability of stress transfer to the femur. The micromotion at the 
      bone-implant interface was explored for different porous femoral stems. The 
      effect of gradient structure design was investigated in the axial direction of 
      the stem. These gradient designs involved a stem with an increasing volume 
      fraction in the axial direction (IAGS) and a decreasing volume fraction along the 
      stem (DAGS). The results showed that the axial stiffness of the stem has a direct 
      effect on stress shielding and an inverse relation to bone-implant micromotion. 
      The finite element analysis results inferred that bone resorption is higher in 
      the stems with IWP structure than in Gyroid at the same volume fraction. Axially 
      graded stems transfer higher stress to the femur than homogenous porous stems. 
      DAGS design of IWP and Gyroid and IAGS Gyroid increased the stress on the 
      proximal-medial of the femur. Homogeneous porous stems with high porosity (80% 
      porosity for IWP and 70% porosity for Gyroid) and DAGS design exhibited low 
      stress shielding and controlled bone-implant interface micromotion within an 
      acceptable range for bone ingrowth.
FAU - Rahmat, Neda
AU  - Rahmat N
AUID- ORCID: 0000-0003-4419-9261
AD  - Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, 
      Tehran, Iran.
FAU - Kadkhodapour, Javad
AU  - Kadkhodapour J
AD  - Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, 
      Tehran, Iran.
FAU - Arbabtafti, Mohammdreza
AU  - Arbabtafti M
AD  - Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, 
      Tehran, Iran.
LA  - eng
PT  - Journal Article
DEP - 20230417
PL  - United States
TA  - Int J Artif Organs
JT  - The International journal of artificial organs
JID - 7802649
SB  - IM
MH  - Humans
MH  - *Hip Prosthesis
MH  - Femur/surgery
MH  - *Bone Resorption
MH  - Lower Extremity
MH  - Finite Element Analysis
MH  - Stress, Mechanical
MH  - Prosthesis Design
OTO - NOTNLM
OT  - Porous femoral stem
OT  - graded material
OT  - micromotion
OT  - stress shielding
OT  - triply periodic minimal surface (TPMS) structure
EDAT- 2023/04/19 06:00
MHDA- 2023/06/08 06:42
CRDT- 2023/04/18 02:02
PHST- 2023/06/08 06:42 [medline]
PHST- 2023/04/19 06:00 [pubmed]
PHST- 2023/04/18 02:02 [entrez]
AID - 10.1177/03913988231168158 [doi]
PST - ppublish
SO  - Int J Artif Organs. 2023 Jun;46(6):370-377. doi: 10.1177/03913988231168158. Epub 
      2023 Apr 17.