In-situ polymerization behaviour of bone cements

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Orthopedic Surgery

Background:

• Bone cement polymerization is a rapid, exothermic process critical in total hip replacements.
• Understanding the non-isothermal reaction kinetics is essential for predicting thermal effects on bone and prosthesis.

Purpose of the Study:

• To analyze the polymerization kinetics of bone cements under isothermal and non-isothermal conditions.
• To develop and validate a phenomenological kinetic model coupled with an energy balance for predicting in situ polymerization behavior.
• To investigate the impact of different application procedures on temperature and reaction profiles within the bone-cement-prosthesis system.

Main Methods:

• Calorimetric analysis to determine polymerization rates.
• Development of a phenomenological kinetic model incorporating autoacceleration and vitrification.
• Integration of the kinetic model with an energy balance for heat transfer analysis.
• Numerical solution methods to couple kinetic and heat transfer models.

Main Results:

• The study presents a validated kinetic model capable of predicting temperature and degree of reaction during bone cement polymerization.
• Calculated temperature and reaction profiles consider system geometry, material properties, and heat generation.
• The model allows for the simulation of various application procedures and their effects on the bone-cement-prosthesis system.

Conclusions:

• The developed coupled kinetic and heat transfer model accurately predicts the in situ polymerization behavior of bone cements.
• This predictive capability can inform the optimization of surgical techniques to mitigate thermal damage and improve cement consolidation.
• The findings contribute to enhancing the safety and efficacy of total hip replacement procedures.