Prediction of bone ingrowth into the porous swelling bone anchors using an osteoconnectivity-based adaptive finite...

Area of Science:

• Biomaterials Science
• Orthopedic Engineering
• Computational Biology

Background:

• Porous co-polymeric bone anchors are used in orthopedic applications.
• Understanding bone ingrowth into these anchors is crucial for improving fixation strength.
• The effect of swelling-induced stress on bone ingrowth requires further investigation.

Purpose of the Study:

• To develop a computational framework to simulate bone ingrowth into swelling bone anchors.
• To evaluate the impact of swelling-induced radial stress on bone ingrowth.
• To assess the influence of pore size on bone ingrowth and anchor mechanical properties.

Main Methods:

• Development of a bone ingrowth framework integrated with hygro-elastic swelling simulation.
• Utilizing the finite element method coupled with an osteoconnectivity matrix.
• Validation of the computational model against experimental data.

Main Results:

• The model successfully predicted sequential bone formation within the porous anchors.
• Swelling-induced radial stresses at the bone-anchor interface significantly stimulated bone ingrowth.
• Smaller pore sizes (within 300-600 μm range) promoted faster and more extensive bone ingrowth compared to larger pores.
• All tested pore sizes led to significant improvements in anchor mechanical integrity and fixation strength.

Conclusions:

• Swelling of co-polymeric bone anchors can effectively stimulate bone ingrowth.
• Pore geometry, size, and interconnectivity are critical factors for optimizing bone ingrowth and anchor performance.
• The developed computational framework provides a valuable tool for designing and evaluating bone ingrowth-promoting orthopedic implants.