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  • Title: The effect of number of throws on knot security with nonidentical sliding knots.
    Author: Ivy JJ, Unger JB, Hurt J, Mukherjee D.
    Journal: Am J Obstet Gynecol; 2004 Nov; 191(5):1618-20. PubMed ID: 15547532.
    Abstract:
    OBJECTIVE: The study was undertaken to test the integrity of nonidentical sliding knots made with 3 throws compared with those made with 6 throws with monofilament and braided absorbable suture. STUDY DESIGN: The 3 throw nonidentical sliding knot was compared with the 6 throw nonidentical sliding knot in 4 different suture groups. The groups were 0-0 polydioxanone, 2-0 polydioxanone, 0-0 polyglactin 910, and 2-0 polyglactin 910. Knots were tested to failure with a tensiometer. The proportion of 3 throw knots becoming untied was compared with the 6 throw knot within each group. Ultimate load required to break tied knots within each suture group was also evaluated. RESULTS: The 3 throw knots had very high rates of knot failure and untied significantly more often than the 6 throw knots. CONCLUSION: The 6 throw nonidentical sliding knot demonstrates superior knot integrity compared with the 3 throw knot with both monofilament and braided absorbable suture.
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