Physical and mechanical characterization of a porous cement for metaphyseal bone repair

Acta Ortopédica Brasileira

Bruno Cimatti¹  Edgard Eduard Engel¹  Marcello Henrique Nogueira-barbosa¹  Paulo Donato Frighetto¹  José Batista Volpon¹ 

关键词: Polymethyl methacrylate;    Bone transplantation;    Bone neoplasms;    Bone substitutes;   

DOI  :  10.1590/1413-785220152304145751

来源: SciELO

【 摘 要 】

OBJECTIVE: Macroporous cement with mechanical properties similar to cancellous bone may improve the treatment of large bone defects in relation to solid acrylic cement. The aim of this study was to compare physical and mechanical characteristics of a polymethyl methacrylate (PMMA) based porous cement with cancellous bone. METHODS: Compressive strength and pore size, interconnectivity, and distribution of cylindrical porous PMMA cement samples containing 10% (G1), 20% (G2) or 30% (G3) effervescent components were analyzed. Results were compared to bovine cancellous bone (G4) and solid PMMA (G5) samples. RESULTS: Scanning electron microscopy (SEM) of all experimental samples (G1 - G3) revealed a random distribution and a wide size variation of pores ranging from 50 µm to 3 mm. Micro-CT showed that G2 have high porosity and lower interconnectivity of pores. No significant differences in yield strength and Young's modulus were observed among G1, G2 and G3. G4 samples were slightly stronger and less elastic than the other groups. Solid PMMA is extremely strong and inelastic. CONCLUSIONS: PMMA based porous cement met the expected characteristics. High porosity with large and interconnected pores may allow for bone ingrowth. Strength and elasticity similar to cancellous bone may enhance mechanical stimuli to bone remodeling. Observational Descriptive Study.

【 授权许可】

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