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Polypropylene is a synthetic monofilament nonabsorbable suture material composed of stereoisomers of polypropylene (Tan et al. 2003). It has the greatest strength of the synthetic nonabsorbable sutures and has no appreciable loss of tensile strength after implantation (Tan et al. 2003); however, evaluation of polypropylene sutures over 2 and 5 year periods show some fragmentation (Postlethwait 1970, 1979). Polypropylene has a very smooth surface and has minimal tissue drag, but this property can also lead to slippage and poor knot security (Ratner et al. 1994). Other disadvantages are the handling properties and memory.