Can the Finite Element Method Be Applied to Patient-Specific Implant Evaluation?

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Computational Mechanics

Background:

• 3D printing enables patient-specific implants for complex bone defects in orthopedic surgery.
• Ensuring reliable fixation of these custom implants remains a significant clinical challenge.
• Finite element analysis (FEA) offers a computational approach to evaluate implant stability.

Purpose of the Study:

• To develop and validate an FEA-based workflow for assessing orthopedic implant fixation.
• To optimize implant design and fixation strategies across different osteointegration stages.
• To predict potential screw-fixation failure modes and timing.

Main Methods:

• An FEA-based flow was developed to evaluate implant fixation.
• The workflow was applied to the pelvic region, analyzing fixation at acute, pre-, and post-osteointegration stages.
• Screw fixation methods (short vs. long screws) and their impact on outcomes were analyzed and validated with patient data.

Main Results:

• FEA predictions closely matched clinical observations regarding screw-fixation failure.
• The analysis identified specific locations and timings of potential fixation failures.
• The study validated the FEA approach using data from two patient cases.

Conclusions:

• FEA is a valuable tool for verifying orthopedic implant designs and fixation strategies.
• This computational method can enhance preoperative planning for improved surgical success.
• The developed FEA flow aids in addressing fixation challenges with 3D-printed orthopedic implants.