Minimum number of throws needed for knot security.

Journal Article (Journal Article)

OBJECTIVE: The purpose of the study was to determine the optimal number of throws to ensure knot security. STUDY DESIGN: Knots were tied with 3, 4, 5, or 6 square throws with 0-gauge coated polyester, polydioxanone, polypropylene, and polyglactin 910. The suture was soaked in 0.9% sodium chloride and subsequently transferred to a tensiometer and broken. RESULTS: A total of 225 knots were tied. Regardless of the suture type, tension at failure for knots with 4 throws, 5 throws, and 6 throws was higher than tension at failure of knots with only 3 throws (p < 0.05 for each). We found no difference in the tensile strength between knots with 4, 5, or 6 throws (p > 0.05 for each). Knots with 4 throws were significantly more likely to come untied than knots with 5 or 6 throws (p < 0.01). CONCLUSIONS: Under laboratory conditions, the ideal knot has 5 throws to maximize tensile strength and rate of untying. This finding does not seem to vary by type of suture material.

Full Text

Duke Authors

Cited Authors

  • Muffly, TM; Kow, N; Iqbal, I; Barber, MD

Published Date

  • 2011

Published In

Volume / Issue

  • 68 / 2

Start / End Page

  • 130 - 133

PubMed ID

  • 21338970

Electronic International Standard Serial Number (EISSN)

  • 1878-7452

Digital Object Identifier (DOI)

  • 10.1016/j.jsurg.2010.11.001


  • eng

Conference Location

  • United States