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Suture Lubrication: Bacitracin, Petroleum, and Saline

Some surgeons run sutures through ointment, mineral oil, or petroleum jelly to ease handling. Direct evidence on this intraoperative practice is limited. A bench comparison found lower failure loads for knots exposed to petroleum gauze than to saline; that result does not by itself establish the effects of every oil or bacitracin ointment, or a difference in clinical wound outcomes.[1] Bacitracin irrigation, postoperative bacitracin wound care, and antimicrobial-coated sutures address different exposures and outcomes and should not be treated as direct tests of suture lubrication.

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​

Knot security depends on friction, throw geometry, pretension, material and plastic deformation.[2] A fluid on a suture can reach the knot as well as the glove–suture interface; the cited studies do not show that saline selectively lubricates the glove while leaving the knot untouched. Technique and the specific suture's instructions still matter.

Evidence​

Petroleum-gauze exposure lowered knot failure load in one bench study​

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]Large-gauge equine-surgery knots exposed to balanced electrolyte solution, carboxymethylcellulose, equine serum or fatMaterial- and medium-specific in-vitro knot findings; not a human saline-lubrication trial

Bacitracin ointment commonly uses a petrolatum vehicle, but Muffly did not test bacitracin ointment, mineral oil, dry knots or clinical closures. Whether coating a particular suture with ointment changes its knot security is an extrapolation, not a measured result of that study.[1]

A separate seven-day immersion study (Alnaqi 2023, fusidic-acid ointment among several agents) measured suture-strand failure load, not knot security or brief intraoperative handling. Its results neither establish benefit nor rule out harm from lubricating a suture before tying.[3]

Bacitracin: in-vitro suture activity is not an outcome study​

  • 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 to prevent SSI (Category IB) and says to consider triclosan-coated sutures (Category II). Neither recommendation is a direct comparison of products used to lubricate a suture.
  • SHEA/IDSA 2022 SSI update[6] — states that bacitracin irrigation is contraindicated, citing anaphylactic-shock cases and US withdrawal of injectable bacitracin. Ointment on a suture is a different exposure; this guidance does not quantify its anaphylaxis risk.
  • Smack 1996 JAMA RCT[11] — 922 dermatologic-surgery patients were randomized to postoperative wound application of white petrolatum or bacitracin. Among evaluable patients, infection was 9/440 (2.0%) versus 4/444 (0.9%; p = 0.37), and contact dermatitis was 0 versus 4 (p = 0.12). These results do not establish equivalence, a statistically significant allergy difference, or the effect of coating sutures during surgery.
  • 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] — a before/after institutional ban on bacitracin irrigation in implant-based breast reconstruction found no infection-rate association; this observational comparison neither proves no benefit nor tests suture ointment.

Engineered alternatives exist​

Manufactured suture coatings offer different handling or antimicrobial properties; check the specific product instructions rather than assuming all coatings behave alike:

  • Polyglactin 910 (Vicryl) is coated with polyglactin 370 / calcium stearate specifically to reduce tissue drag.
  • Silicone- and wax-coated multifilaments are designed to reduce passage friction; knot behavior depends on material and technique and should not be assumed unchanged for every product.[9]
  • Triclosan-coated sutures (Vicryl Plus, PDS Plus, Monocryl Plus) are manufactured antimicrobial products for an SSI-prevention purpose. CDC says to consider them (Category II); the guideline does not compare their knot security or allergy risk with ad-hoc ointment lubrication.[5]

Summary Comparison​

AgentEvidence for handlingKnot / infection evidencePractical interpretation
Sterile salineDirect glide benefit not quantified hereComparator in Muffly knot test; no SSI-prevention claim[1]If moisture is needed, use sterile technique and follow suture IFU; do not claim proven clinical superiority
Petroleum gauzeHandling benefit not measuredLower mean bench knot-failure load than saline (116.7 vs 123.8 N, p = 0.002)[1]Avoid assuming that petroleum exposure is mechanically neutral for a knot-critical closure
Mineral oil / bacitracin ointmentSpecific intraoperative coating effect untested in the cited knot studyBacitracin in-vitro antimicrobial activity is not clinical SSI benefit; irrigation and postoperative-wound data are different settings[4][6][11]Do not use an unverified coating to claim knot or infection benefit; consider allergy history and IFU
Triclosan-coated suturesManufactured coating, not ad-hoc lubricantCDC Category II: consider for SSI prevention; knot comparison to ointment not supplied[5]Consider when appropriate for infection prevention, not as a proven solution to handling friction

Bottom Line​

  • Do not rank saline, petroleum, mineral oil and bacitracin for clinical knot or wound outcomes from these heterogeneous bench, irrigation and postoperative studies.
  • If a suture is difficult to handle, first check material/coating instructions and technique; sterile saline on the glove is a practical option, but its clinical advantage over alternatives has not been established here (see Glove Wetting for Knot Tying).
  • Petroleum-gauze exposure lowered bench knot-failure load relative to saline. Bacitracin ointment on a suture has no demonstrated infection-prevention or handling advantage in the cited studies; do not infer a precise harm rate from bacitracin irrigation or postoperative skin ointment studies.

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