Standardized Morphological Modeling and Simulation-Based Validation of a Novel Tibiotalar Fusion Implant

Area of Science:

• Orthopedic biomechanics
• Biomedical engineering
• Surgical implant design

Background:

• Tibiotalar joint fusion is a common surgical procedure.
• Existing fixation methods can lead to suboptimal outcomes.
• A standardized anatomical model is needed for implant development.

Purpose of the Study:

• To develop and validate a standardized geometric model of the tibiotalar joint.
• To design and evaluate a novel fusion implant based on this model.
• To compare the biomechanical performance of the novel implant against traditional fixation methods.

Main Methods:

• Construction of a morphological database from 30 computed tomography (CT) scans.
• Development of a novel fusion implant geometrically matched to the tibiotalar joint.
• Nonlinear finite element (FE) analysis comparing three fixation strategies.

Main Results:

• The novel implant achieved 95.0% joint contact area and 0.033 mm tibial micromotion.
• Anterior plate fixation resulted in 49.8% contact and 0.068 mm micromotion.
• Compression screws showed 78.2% contact and 0.355 mm micromotion, with increased stress concentration.

Conclusions:

• A standardized tibiotalar joint model ensures broad implant applicability.
• The novel implant significantly enhances joint contact and reduces micromotion.
• This implant represents a promising advancement for tibiotalar joint fusion surgery.