Common modifiable risk factors in total joint arthroplasty: a 2021 update—smoking
It has been demonstrated that cigarette smoking (and presumably all forms of tobacco use) impairs wound healing and increases the chance of wound infection after orthopedic surgical procedures. Potential mechanisms for these observations include decreased blood flow due to vasoconstriction and local tissue hypoxia. Aside from its effect on soft tissues, it is believed that cigarette smoking also affects bone regeneration and bone healing directly, leading to nonunion after lumbar or ankle arthrodesis . Therefore, it is not surprising that smoking has been shown to be a risk factor for various orthopedic surgeries, including total joint arthroplasties (TJA).
Among the three modifiable risk factors (diabetes, obesity, and tobacco smoking) discussed in this series of articles, tobacco smoking has the weakest evidence and had been, until recently, infrequently mentioned during patient counseling. Are heavy smokers reasonable candidates for TJA? Are the effects of chronic smoking reversible? Should patients be advised to stop smoking before surgeries? Steven MacDonald from The University of Western Ontario, London, Ontario, Canada reviews the current evidence with us.
University of Western Ontario
Does active smoking have a negative impact on total joint arthroplasty?
Roughly 3,500 chemicals are released during cigarette smoking. Among these chemicals, nicotine as a vasoconstrictor reduces blood flow to skin, increases platelet aggregation, and inhibits the function of fibroblasts, red blood cells, and macrophages. Carbon monoxide, via its stronger affinity for hemoglobin than oxygen, causes the displacement of oxygen from hemoglobin, which leads to a lower oxygen tension in cutaneous and subcutaneous tissues. Hydrogen cyanide inhibits the activity of enzymes involved in oxidative metabolism and oxygen transport at a cellular level [1, 2]. With these known physiological effects, it is therefore natural to suspect that tobacco smoking can lead to negative outcomes after TJA. The clinical evidence, however, has been inconclusive and the degree of correlation unclear . As has been pointed out by many, in comparison to nonsmokers, smokers had an increased risk of wound complications, deep infections, implant revisions, hospital readmissions, reoperations, and mortality, though others had reported no statistically significant differences on the same outcomes between smokers and nonsmokers [3, 4].
The discrepancies among different publications may be explained by, for example, the differences between total hip arthroplasty (THA) and total knee arthroplasty (TKA), as seen in the reports by Khan et al  and Peersman et al . While Khan et al  reported that no statistically increased risk of superficial or deep infection was observed for smokers in THA, Peersman et al  reported that active smoking was associated with an increased overall risk of infection after TKA. Patient heterogeneity could be another explanation: in a 2011 study by Singh , results showed that, when nonsmokers were used as the reference, former smokers had higher odds of any postoperative complication (odds ratio [95% confidence interval, CI], OR = 1.32 [1.05, 1.66]) than current smokers (OR [95% CI] = 1.24 [1.01, 1.54]). Former smokers were also observed to have higher odds of death (OR [95% CI] = 1.69 [1.08, 2.64]) than current smokers (OR = [95% CI] 1.63 [1.06, 2.51]). Singh  reasoned that in the study population, the current smokers tended to be younger than the former smokers and therefore the observation may reflect the survival advantage of the younger cohort of patients; readers should therefore be cautious when interpreting the results. Not surprisingly, a number of more recent studies using multivariate regression analysis to adjust for confounding factors showed that former smokers had reduced risk in periprosthetic joint infection (PJI) or reoperation for infection in comparison to current smokers after primary TJA [4, 8].
Other factors such as small sample size and short-term outcomes may also explain the contradictory results [3, 4]. In addition, differences in the definition of the outcome measures (eg, surgical site infection, SSI) and smoking status may also contribute to the different results of the studies .
Read the full article with your AO login
- Recent publications on outcomes after primary total joint arthroplasty
- Is there a difference between heavy smokers versus light smokers?
- Variations in the definition of smoking status
- Quitting smoking: better late than never
Additional AO resources
Access videos, tools, and other assets.
- AOF books in Thieme store
- Upcoming events: AO Recon Course finder
- AO Global Data
This series of articles was created with the support of the following specialists (in alphabetical order):
Matthew P Abdel
Rochester, United States
University of Western Ontario
Michael A Mont
Rubin Institute for Advanced Orthopedics
Baltimore, United States
This article was compiled by Maio Chen, Senior Project Manager Medical Writing, AO Foundation, Switzerland.
- Porter SE, Hanley EN. The Musculoskeletal Effects of Smoking. JAAOS – Journal of the American Academy of Orthopaedic Surgeons. 2001;9(1):9–17.
- Bojan B, Perni S, Prokopovich P. Systematic Review and Meta-Analysis of Tobacco Use as a Risk Factor for Prosthetic Joint Infection After Total Hip Replacement. Arthroplast Today. 2020 Dec;6(4):959–971.
- Matharu GS, Mouchti S, Twigg S, et al. The effect of smoking on outcomes following primary total hip and knee arthroplasty: a population-based cohort study of 117,024 patients. Acta Orthop. 2019 Dec;90(6):559–567.
- Tischler EH, Matsen Ko L, Chen AF, et al. Smoking Increases the Rate of Reoperation for Infection within 90 Days After Primary Total Joint Arthroplasty. J Bone Joint Surg Am. 2017 Feb 15;99(4):295–304.
- Khan LA, Cowie JG, Ballantyne JA, et al. The complication rate and medium-term functional outcome after total hip replacement in smokers. Hip Int. 2009 Jan-Mar;19(1):47–51.
- Peersman G, Laskin R, Davis J, et al. Infection in total knee replacement: a retrospective review of 6489 total knee replacements. Clin Orthop Relat Res. 2001 Nov(392):15–23.
- Singh JA. Smoking and outcomes after knee and hip arthroplasty: a systematic review. J Rheumatol. 2011 Sep;38(9):1824–1834.
- Bedard NA, DeMik DE, Owens JM, et al. Tobacco Use and Risk of Wound Complications and Periprosthetic Joint Infection: A Systematic Review and Meta-Analysis of Primary Total Joint Arthroplasty Procedures. J Arthroplasty. 2019 Feb;34(2):385–396.e384.
- Singh JA, Schleck C, Harmsen WS, et al. Current tobacco use is associated with higher rates of implant revision and deep infection after total hip or knee arthroplasty: a prospective cohort study. BMC Med. 2015 Nov 19;13:283.
- Duchman KR, Gao Y, Pugely AJ, et al. The Effect of Smoking on Short-Term Complications Following Total Hip and Knee Arthroplasty. J Bone Joint Surg Am. 2015 Jul 1;97(13):1049–1058.
- Sahota S, Lovecchio F, Harold RE, et al. The Effect of Smoking on Thirty-Day Postoperative Complications After Total Joint Arthroplasty: A Propensity Score-Matched Analysis. J Arthroplasty. 2018 Jan;33(1):30–35.
- Bedard NA, Dowdle SB, Owens JM, et al. What is the Impact of Smoking on Revision Total Hip Arthroplasty? J Arthroplasty. 2018 Jul;33(7s):S182–s185.
- Bedard NA, Dowdle SB, Wilkinson BG, et al. What is the Impact of Smoking on Revision Total Knee Arthroplasty? J Arthroplasty. 2018 Jul;33(7s):S172–s176.
- Møller AM, Villebro N, Pedersen T, et al. Effect of preoperative smoking intervention on postoperative complications: a randomised clinical trial. Lancet. 2002 Jan 12;359(9301):114–117.
- Thomsen T, Villebro N, Møller AM. Interventions for preoperative smoking cessation. Cochrane Database Syst Rev. 2014 Mar 27;2014(3):Cd002294.
- Hamilton WG. No Smoking Allowed: Is the Operating Room the Next Place That Smoking Patients Undergoing Total Joint Arthroplasty Will Be Banned?: Commentary on an article by Eric H Tischler, BA, et al.: “Smoking Increases the Rate of Reoperation for Infection within 90 Days After Primary Total Joint Arthroplasty”. J Bone Joint Surg Am. 2017 Feb 15;99(4):e17.