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Characterization of Heavyweight and Lightweight Polypropylene Prosthetic Mesh Explants From a Single Patient

Department of Biological Engineering, University of Missouri-Columbia, Columbia, Missouri

S.L. Bachman, MD

Department of General Surgery, University of Missouri-Columbia, Columbia, Missouri

S.A. Grant, PhD

Department of Biological Engineering, University of Missouri-Columbia, Columbia, Missouri

D.S. Cleveland, DO

Department of Pathology and Anatomical Sciences University of Missouri-Columbia, Columbia, Missouri

T.S. Loy, MD

Department of Pathology and Anatomical Sciences University of Missouri-Columbia, Columbia, Missouri

B.J. Ramshaw, MD

Department of General Surgery, University of Missouri-Columbia, Columbia, Missouri, ramshawb{at}health.missouri.edu

Although polypropylene has been used as a hernia repair material for nearly 50 years, very little science has been applied to studying the body's effect on this material. It is possible that oxidation of mesh occurs as a result of the chemical structure of polypropylene and the physiological conditions to which it is subjected; this leads to embrittlement of the material, impaired abdominal movement, and chronic pain. It is also possible that lightweight polypropylene meshes undergo less oxidation due to a reduced inflammatory reaction. The objective of this study was to characterize explanted hernia meshes using techniques such as scanning electron microscopy, differential scanning calorimetry, thermogravimetric analysis, and compliance testing to determine whether the mesh density of polypropylene affects the oxidative degradation of the material. The hypothesis was that heavyweight polypropylene would incite a more intense inflammatory response than lightweight polypropylene and thus undergo greater oxidative degradation. Overall, the results support this theory.

Key Words: hernia mesh • inflammation • lightweight • materials characterization • oxidation • polypropylene

Surgical Innovation, Vol. 14, No. 3, 168-176 (2007)
DOI: 10.1177/1553350607306356


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