Knot tying practice — anywhere, anytime

Date
August 10, 2025
URL
https://x.com/WithAScalpel/status/1954530617174970488
Categories
Surgical Training
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Knot Tying Practice — Fundamentals in Surgical Technique

Knot tying is one of the most fundamental skills in surgery. Mastery of this seemingly simple task is essential for ensuring secure hemostasis, minimizing tissue trauma, and maintaining stability in the operative field. Because surgical knots form the foundation of wound closure and vessel ligation, deliberate practice is indispensable [1,2].

Key Principles of Knot Tying

  1. Control of Both Hands

    2. Effective knot tying requires coordinated movement of the dominant and non-dominant hands. Develop ambidexterity so each throw is placed with the same pathway, direction, and tension.

  2. Avoidance of Tissue Tension

    3. Tighten against the suture, not the tissue to avoid ischemia or tearing, and to allow the knot to seat properly and reproducibly [1].

  3. Stable Base

    4. Anchor on a reliable base (vessel, graft, or tissue plane). A slipping base undermines security regardless of technique or material.

  4. Consistency in Technique

    5. Use a repeatable sequence of alternating, flat throws with equal and opposite hand motion. Evidence shows knot security hinges on technique and material (and number of throws), rather than suture size per se. As a practical rule of thumb, use ≥4 throws for square or surgeon’s knots and ≥5 for sliding constructs, adjusting for material friction (monofilament vs braided) [3].

Practical Considerations

  • Practice Anywhere

    • A short length of suture and a fixed post suffice. Build from table-top ties to under-tension ties and then to confined/deep fields to stress-test consistency [1,2].

  • Types of Knots

    • The square knot is the gold standard for most situations; the surgeon’s knot can add initial friction when tensioned tissues tend to separate; sliding knots are useful in specific scenarios but generally demand more throws for equivalent security [3].

  • Hand vs Instrument Ties

    • For certain configurations, instrument ties can yield equal or greater security than manual ties—useful in depth or limited exposure—provided the throws remain flat and alternating [4].

  • Error Prevention & Standardization

    • Common pitfalls include crossed throws, unequal strand tension, over-short tails, and torqueing the knot during seating. Studies show wide variability in surgeons’ knot techniques, supporting standardized curricula and objective assessment (loop security, failure mode, throws to failure) [5,6]. Faulty methods can create dangerous knots even when they appear neat—precision in sequence and tension matters [7].

Clinical Relevance

Reliable knot security shortens operative time, reduces bleeding and rework, and protects tissue. Building disciplined, reproducible habits—one flat, alternating throw at a time—translates directly to safer closures and ligations in every specialty [1–3].

References

[1] E. Bushong, J. E. Janis. Knot Security 101: A Comprehensive Practical Review to Optimal… Plastic and Reconstructive Surgery, Global Open. 2024. doi:10.1097/gox.0000000000006047.

[2] S. Ching, C. Mok, Y. Koh, S. Tan, Y. Tan. Assessment of surgical trainees’ quality of knot-tying. Journal of Surgical Education. 2013. doi:10.1016/j.jsurg.2012.07.002.

[3] Eric Silver, Rong Wu, J. Grady, Liansheng Song. Knot Security—How is it Affected by Suture Technique, Material, and Number of Throws? Journal of Oral and Maxillofacial Surgery. 2016. doi:10.1016/j.joms.2016.02.004.

[4] Jacqueline D. James, Melissa M. Wu, E. K. Batra, G. Rodeheaver, et al. Technical considerations in manual and instrument tying techniques. Journal of Emergency Medicine. 1992. doi:10.1016/0736-4679(92)90277-Z.

[5] L. Fischer, T. Bruckner, B. Müller-Stich, J. Höer, H. Knaebel, et al. Variability of surgical knot-tying techniques: do we need to standardize? Langenbeck’s Archives of Surgery. 2010. doi:10.1007/s00423-009-0575-8.

[6] E. K. Batra, D. A. Franz, M. A. Towler, G. Rodeheaver, J. Thacker. Influence of surgeon’s tying technique on knot security. Journal of Applied Biomaterials. 1993. doi:10.1002/JAB.770040305.

[7] E. Drabble, S. Spanopoulou, E. Sioka, E. Politaki, I. Tzortzis, et al. How to tie dangerous surgical knots: easily. Can we avoid this? BMJ Surgery, Interventions, & Health Technologies. 2021. doi:10.1136/bmjsit-2021-000091.