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Hydroxyapatite/PMMA composites as bone cements.

K T Chu¹, Y Oshida, E B Hancock

¹Kaohsiung Chang Gung Memorial Hospital, No. 123 Dabi Rd., Niausung Shiang, Kaohsiung 833, Taiwan.

Bio-Medical Materials and Engineering

|February 6, 2004

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Bovine-bone derived hydroxyapatite/polymethyl methacrylate (HA/PMMA) composites show improved mechanical and physical properties compared to standard HA/PMMA bone cements. These novel composites offer enhanced performance for bone fixation applications.

Area of Science:

Biomaterials Science
Polymer Chemistry
Orthopedic Engineering

Background:

Polymethyl methacrylate (PMMA) is the standard bone cement for total hip prostheses.
Conventional PMMA bone cements exhibit limitations in mechanical properties and exothermic reaction.
Ideal bone cements require specific handling, biological, and mechanical characteristics.

Purpose of the Study:

To compare the mechanical and physical properties of hydroxyapatite/PMMA (HA/PMMA) and bovine-bone derived HA/PMMA (BB) composites.
To evaluate the effects of varying HA and BB particle concentrations on composite properties.

Main Methods:

In vitro study comparing HA/PMMA and BB composite groups.
Fabrication of composite samples using an admixing method.

Related Experiment Videos

Assessment of mechanical properties (three-point bending strength, energy-to-break, modulus of elasticity) and physical properties (setting time, water sorption, exothermic heat).

Main Results:

Addition of HA and BB particles increased water sorption in PMMA composites.
10-20% HA and 0-10% BB ratios significantly improved mechanical properties.
Higher concentrations (over 40% HA or BB) were needed to reduce peak polymerization temperature.
The BB group demonstrated superior overall properties compared to the HA group.

Conclusions:

Bovine-bone derived HA/PMMA composites offer enhanced mechanical and physical properties over standard HA/PMMA.
Optimized ratios of HA and BB particles can improve bone cement performance.
BB composites present a promising alternative for bone fixation applications.