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Suture Lubrication: Bacitracin, Petroleum, and Saline

Many surgeons routinely run sutures through bacitracin ointment, mineral oil, or petroleum jelly to make them glide more easily through the fingers and tissues. The practice is intuitively reasonable — friction is the problem and oil-based lubricants reduce it. The bench and clinical evidence, however, tells a more nuanced story: petroleum-based agents compromise knot security, bacitracin carries a small but real anaphylaxis risk with limited antimicrobial benefit over engineered alternatives, and sterile saline alone provides the friction reduction surgeons actually want without the downside.

For the companion maneuver — wetting the glove rather than the suture — see Glove Wetting for Knot Tying. For the broader material context (monofilament vs braided, triclosan-coated sutures), see Sutures.

Why Lubricant Choice Matters at the Knot​

The strength of a surgical knot depends on inter-strand friction within the knot itself — without it, the throws unwind under load.[2] A lubricant that reduces friction only at the glove–suture interface (where you want it) helps; a lubricant that also reduces friction inside the knot (where you do not want it) undermines the knot's resistance to slippage. Saline does the first; petroleum-based agents do both.

Evidence​

Petroleum and oil-based lubricants reduce knot failure load​

StudyDesignFinding
Muffly 2012[1]Knotted PDS, polyglyconate, polyglycolide/lactide, silk; petroleum gauze vs salinePetroleum-exposed knots failed at significantly lower tensile load (116.7 N vs 123.8 N, p = 0.002)
Johanns 2023[2]Mechanical physics of surgical knotsFriction within the knot is a primary determinant of knot strength; agents that excessively reduce it compromise slippage resistance
Coleridge 2017[10]Surgeon's, square, Aberdeen knots in fluid mediaSaline / serum / fat at worst neutral, often improved knot-holding capacity

Bacitracin ointment is formulated in a white petrolatum base, so its lubrication behavior is essentially that of petroleum jelly. Extrapolating from Muffly, knots tied through bacitracin ointment can be expected to have lower failure loads than knots tied dry or with saline.[1]

A separate study (Alnaqi 2023, fusidic-acid ointment in a lipid base) reported that ointment immersion increased the failure load of the suture strand itself — but that measurement was strand tensile strength, not knot security. Since the knot is almost always the weakest link, the strand finding does not redeem the practice.[3]

Bacitracin on sutures — antimicrobial benefit is modest; safety is not free​

  • Adkins 2022[4] — bacitracin-soaked sutures had measurable in vitro inhibition zones against S. aureus and MRSA versus unsoaked controls. Real but in-vitro only.
  • CDC 2017 SSI guideline[5] — recommends against applying antimicrobial agents to the surgical incision (Category IB). Suggests considering triclosan-coated sutures (Category II) as the engineered alternative.
  • SHEA/IDSA 2022 SSI update[6] — explicitly states that bacitracin irrigation is contraindicated — injectable bacitracin was withdrawn from the US market after intraoperative anaphylactic shock case reports. Applying bacitracin ointment to a suture is not the same as irrigating with it, but the anaphylaxis pathway exists through mucosal/wound exposure.
  • Smack 1996 JAMA RCT[11] — 922 ambulatory-surgery patients randomized to white petrolatum vs bacitracin postoperatively. No difference in infection rate (2.0% vs 0.9%), but four cases of allergic contact dermatitis in the bacitracin arm and none in the petrolatum arm. The first randomized signal that bacitracin offers no infection benefit while carrying a real allergy cost.
  • Goswami 2019[7] — polymyxin/bacitracin irrigation was ineffective at bacterial killing in vitro and inferior to povidone-iodine, while showing fibroblast cytotoxicity.
  • Roy 2024[8] — outcomes after the institutional ban on bacitracin irrigation in implant-based breast reconstruction showed no association between bacitracin use and postoperative infection rates, confirming the irrigation provided no measurable benefit.

Engineered alternatives exist​

Suture manufacturers solved the friction problem on the bench rather than the back table:

  • Polyglactin 910 (Vicryl) is coated with polyglactin 370 / calcium stearate specifically to reduce tissue drag.
  • Silicone- and wax-coated multifilaments reduce passage friction without disturbing knot mechanics.[9]
  • Triclosan-coated sutures (Vicryl Plus, PDS Plus, Monocryl Plus) deliver antimicrobial coverage at the suture line without the knot-security and allergy costs of ad-hoc ointment lubrication; the CDC frames them as the evidence-based way to capture the antimicrobial benefit some surgeons are reaching for when they coat sutures with bacitracin.[5]

Summary Comparison​

AgentFriction reductionKnot securityAntimicrobialSafetyVerdict
Sterile salineModerate (glove–suture interface)Maintained / improved[10]NoneNonePreferred for lubrication
Petroleum / mineral oilHigh (glove + intra-knot)Reduced (116.7 vs 123.8 N, p = 0.002)[1]NoneLowAvoid for knot-critical closures
Bacitracin ointment (petrolatum vehicle)HighLikely reduced (petrolatum)Modest in vitro[4]Anaphylaxis + allergic contact dermatitis[6][11]Avoid; little upside
Triclosan-coated suturesBuilt into coatingDesigned to maintainClass-I evidence for SSI reduction[5]MinimalPreferred when antimicrobial benefit is desired

Bottom Line​

  • Saline > petroleum > bacitracin for the specific goal of helping a suture glide.
  • The right tool for "the suture is too sticky" is saline on the glove (see Glove Wetting for Knot Tying) and the right tool for "I want the suture line to be antimicrobial" is a triclosan-coated suture, not bacitracin ointment.
  • The practice of running sutures through bacitracin or petroleum jelly is a tradition with measurable mechanical and safety costs and no clinical-outcome advantage in the modern evidence base.

References​

1. Muffly TM, Couri B, Edwards A, et al. "Effect of petroleum gauze packing on the mechanical properties of suture materials." J Surg Educ. 2012;69(1):37–40. doi:10.1016/j.jsurg.2011.06.012

2. Johanns P, Baek C, Grandgeorge P, et al. "The strength of surgical knots involves a critical interplay between friction and elastoplasticity." Sci Adv. 2023;9(23):eadg8861. doi:10.1126/sciadv.adg8861

3. Alnaqi A, Burhamah W, Al-Sultan AT, Taqi E. "The effect of topical agents on the tensile strength of absorbable and non-absorbable suture materials — an in vitro study." World J Surg. 2023;47(2):448–454. doi:10.1007/s00268-022-06788-3

4. Adkins JM, Ahmar RA, Yu HD, Musick ST, Alberico AM. "Comparison of antimicrobial activity between bacitracin-soaked sutures and triclosan-coated suture." J Surg Res. 2022;270:203–207. doi:10.1016/j.jss.2021.09.010

5. Berríos-Torres SI, Umscheid CA, Bratzler DW, et al. "Centers for Disease Control and Prevention guideline for the prevention of surgical site infection, 2017." JAMA Surg. 2017;152(8):784–791. doi:10.1001/jamasurg.2017.0904

6. Calderwood MS, Anderson DJ, Bratzler DW, et al. "Strategies to prevent surgical site infections in acute-care hospitals: 2022 update." Infect Control Hosp Epidemiol. 2023;44(5):695–720. doi:10.1017/ice.2023.67

7. Goswami K, Cho J, Foltz C, et al. "Polymyxin and bacitracin in the irrigation solution provide no benefit for bacterial killing in vitro." J Bone Joint Surg Am. 2019;101(18):1689–1697. doi:10.2106/JBJS.18.01362

8. Roy N, Oleru O, Amakiri U, et al. "Outcomes after implant-based breast reconstruction following the national institution of a ban on bacitracin irrigation." Ann Plast Surg. 2024;92(4S Suppl 2):S191–S195. doi:10.1097/SAP.0000000000003794

9. Makrygiannis IH, Nikolaidis AK, Tilaveridis I, et al. "Coated sutures for use in oral surgery: a comprehensive review." Clin Oral Investig. 2025;29(2):109. doi:10.1007/s00784-025-06176-w

10. Coleridge M, Gillen AM, Farag R, Hanson RR, Munsterman AS. "Effect of fluid media on the mechanical properties of continuous pattern-ending surgeon's, square, and Aberdeen knots in vitro." Vet Surg. 2017;46(2):306–315. doi:10.1111/vsu.12627

11. Smack DP, Harrington AC, Dunn C, et al. "Infection and allergy incidence in ambulatory surgery patients using white petrolatum vs bacitracin ointment. A randomized controlled trial." JAMA. 1996;276(12):972–977. doi:10.1001/jama.1996.03540120050033