Patients who use cannabis before undergoing surgery for a broken leg face significantly higher risks of infections, reoperations, and mental health challenges compared to non users, according to a large scale study published this week. The research, one of the first to examine the perioperative effects of cannabis in trauma patients, also found that combining cannabis with nicotine amplifies these risks, raising concerns for surgeons and public health experts as cannabis use becomes more widespread. The study, led by researchers at UCLA and Case Western Reserve University, analyzed electronic health records from over 40,000 adults who underwent surgical fixation for lower extremity fractures between 2015 and 2023. The findings underscore the need for better preoperative screening and counseling, particularly as legalization expands access to cannabis across the U.S. and beyond.
Clinical Significance
This study provides some of the clearest evidence to date that cannabis use may complicate recovery from orthopedic surgery. While previous research has explored the effects of nicotine on surgical outcomes, the role of cannabis has remained less understood, despite its growing prevalence. The findings suggest that cannabis is not a benign substance in the perioperative setting, particularly for patients undergoing trauma related procedures.
The research highlights a dose dependent relationship between substance use and complications, with nicotine showing broader adverse effects than cannabis alone. However, when both substances are used together, the risks compound, leading to higher rates of infections, reoperations, and respiratory complications. These results challenge the assumption that cannabis is a low risk alternative to other substances in surgical patients.
Deep Dive and Research Findings
The study used data from the TriNetX Research Network, a global platform aggregating de identified electronic health records from over 90 health systems. Researchers divided patients into four groups: cannabis only users, nicotine only users, concurrent users of both substances, and non users. The analysis focused on postoperative complications, including surgical site infections, nonunion or malunion of fractures, reoperations, transfusions, and mental health outcomes such as anxiety and depression.
Key findings included:
- Cannabis only users had higher rates of deep implant infections, nonunion or malunion, reoperations, transfusions, readmissions, anxiety, and depression compared to non users.
- Nicotine only users experienced even broader complications, including wound infections, pneumonia, myocardial infarction, opioid use, chronic pain, and death.
- Concurrent users of cannabis and nicotine faced the highest risks, with elevated rates of superficial and deep infections, reoperations, amputations, respiratory failure, and chronic pain.
- Coagulation parameters, such as prothrombin time and activated partial thromboplastin time, did not show consistent differences across groups, suggesting that bleeding risks may not be a primary concern.
The study’s retrospective design limits the ability to establish causality, but the large sample size and robust statistical methods provide compelling evidence of an association between substance use and poorer surgical outcomes.
Future Outlook and Medical Implications
The findings raise important questions about how healthcare providers should address substance use in surgical patients. With cannabis legalization expanding, surgeons and anesthesiologists may need to incorporate routine screening for cannabis use into preoperative assessments, similar to current practices for nicotine and alcohol. The study’s authors call for prospective research to quantify cannabis exposure more precisely and explore potential mechanisms behind the observed complications.
For now, the results suggest that patients should be counseled about the risks of cannabis use before surgery, particularly if they also use nicotine. Public health campaigns may need to emphasize these risks, especially in regions where cannabis is legal and socially normalized. The study also highlights the need for further research into whether abstaining from cannabis before surgery could improve outcomes.
Patient or Practitioner Guidance
For patients undergoing orthopedic surgery, particularly for lower extremity fractures, the study offers several key takeaways:
- Preoperative Screening: Patients should disclose cannabis and nicotine use to their surgical team, as these substances may influence recovery and complication risks.
- Risk Awareness: Cannabis use, especially when combined with nicotine, is associated with higher rates of infections, reoperations, and mental health challenges. Patients should weigh these risks when considering substance use before surgery.
- Counseling: Surgeons and primary care providers should discuss the potential perioperative risks of cannabis and nicotine use with patients, particularly those scheduled for trauma related procedures.
- Future Research: While this study provides valuable insights, more research is needed to determine whether reducing or abstaining from cannabis before surgery could improve outcomes. Patients should stay informed as new evidence emerges.
For healthcare providers, the study underscores the importance of integrating substance use history into preoperative evaluations. Anesthesiologists, surgeons, and nurses should be aware of the potential for increased complications in patients who use cannabis, nicotine, or both. Tailored counseling and risk stratification may help mitigate these risks in the future.
Key Takeaways
- Cannabis use before lower extremity fracture surgery is linked to higher rates of infections, reoperations, and mental health complications.
- Combining cannabis with nicotine amplifies these risks, leading to even greater rates of surgical and medical complications.
- The study highlights the need for better preoperative screening and counseling for substance use, particularly as cannabis legalization expands.
- Patients should disclose cannabis and nicotine use to their surgical team to assess potential risks and optimize recovery.
Frequently Asked Questions
Does cannabis use before surgery increase the risk of complications?
Yes, the study found that cannabis use before lower extremity fracture surgery is associated with higher rates of infections, reoperations, transfusions, and mental health challenges such as anxiety and depression.
Are the risks higher if I use both cannabis and nicotine?
Yes, the study showed that concurrent use of cannabis and nicotine leads to compounded risks, including higher rates of infections, reoperations, respiratory failure, and chronic pain compared to using either substance alone.
Should I stop using cannabis before surgery?
While the study does not provide definitive guidance on abstinence, it suggests that cannabis use may complicate recovery. Patients should discuss their substance use with their surgical team to assess individual risks and make informed decisions.
What complications were most common in cannabis users?
The most common complications in cannabis users included deep implant infections, nonunion or malunion of fractures, reoperations, transfusions, readmissions, and increased rates of anxiety and depression.
Does this study apply to all types of surgery?
This study specifically focused on patients undergoing surgical fixation for lower extremity fractures. While the findings may have implications for other types of surgery, more research is needed to determine the broader applicability of these results.
Medical Review: MedSense Editorial Board
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