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Related Concept Videos

Simple Trusses01:21

Simple Trusses

A truss is a structural framework consisting of slender members connected at joints, designed to support external loads while minimizing material usage and weight. Simple trusses are a type of planar truss where all members lie within a single two-dimensional plane.
The most basic planar truss is a simple truss with three members arranged in a triangular formation. This triangular truss is inherently stable and rigid due to its geometry, making it an ideal starting point for creating more...
Space Trusses01:25

Space Trusses

A space truss is a three-dimensional counterpart of a planar truss. These structures consist of members connected at their ends, often utilizing ball-and-socket joints to create a stable and versatile framework. The space truss is widely used in various construction projects due to its adaptability and capacity to withstand complex loads.
At the core of a space truss lies the fundamental unit known as the tetrahedron. This structure is composed of six members that form a three-dimensional shape...
Brick Masonry01:12

Brick Masonry

Brick masonry uses bricks as the building blocks and involves building walls from individual bricks laid in mortar. The basic building block of brick masonry is the wythe, a vertical layer of bricks with a thickness of one brick. Within a wythe, bricks can be laid in various courses or patterns, with the most common being the stretcher course, where bricks are laid with their long edge horizontal and face parallel to the wall.
For thicker walls, multiple wythes are bonded together using...
Torsion of Noncircular Members01:16

Torsion of Noncircular Members

Circular shafts undergoing torsional stress maintain their cross-sectional integrity due to their axisymmetric nature. This symmetry ensures an even distribution of stress, allowing the shaft to withstand torsion without distorting. In contrast, square bars, lacking this axial symmetry, experience significant distortion across their cross-sections when subjected to torsion, with the exception of along their diagonals and at lines connecting midpoints. A detailed examination of a cubic element...
Space Trusses: Problem Solving01:29

Space Trusses: Problem Solving

A space truss is a three-dimensional counterpart of a planar truss. These structures consist of members connected at their ends, often utilizing ball-and-socket joints to create a stable and versatile framework. Due to its adaptability and capacity to withstand complex loads, the space truss is widely used in various construction projects.
Consider a tripod consisting of a tetrahedral space truss with a ball-and-socket joint at C. Suppose the height and lengths of the horizontal and vertical...
Stability of structures01:14

Stability of structures

In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...

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Related Experiment Video

Updated: Jul 13, 2026

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Flat square knots: are 3 throws enough?

Tracy Behm1, James B Unger, Joseph J Ivy

  • 1Division of Gynecologic Pelvic Surgery, Department of Obstetrics and Gynecology, Louisiana State University Health Sciences Center, Shreveport, LA, USA.

American Journal of Obstetrics and Gynecology
|August 11, 2007
PubMed
Summary

Increasing suture knot throws enhances the integrity of poliglecaprone 25 (Monocryl) and polyglactin 910 (Vicryl) knots. However, adding throws to silk knots did not improve their stability.

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Area of Science:

  • Surgical techniques and materials science
  • Biomedical engineering

Background:

  • Surgical knots are critical for wound closure and device fixation.
  • The integrity of surgical knots can be influenced by suture material and the number of throws used.

Purpose of the Study:

  • To evaluate the mechanical integrity of flat square surgical knots.
  • To compare knot security across different suture materials and throw configurations.

Main Methods:

  • Three suture types (poliglecaprone 25, polyglactin 910, silk) in 0 and 2-0 gauges were tested.
  • Flat square knots were tied with either 3 or 5 throws and subjected to failure testing.
  • The primary outcome was the rate of knot untying for 3-throw versus 5-throw configurations.

Main Results:

  • High untying rates were observed for poliglecaprone 25 and polyglactin 910 knots tied with 3 throws.
  • Increasing to 5 throws significantly reduced the failure rate for poliglecaprone 25 and polyglactin 910.
  • No significant improvement in knot security was found for silk when increasing from 3 to 5 throws.

Conclusions:

  • Increasing the number of throws from 3 to 5 enhances the security of poliglecaprone 25 and polyglactin 910 knots.
  • The number of throws does not significantly impact the integrity of silk surgical knots.
  • Suture material choice and throw technique are crucial for ensuring surgical knot security.