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All issues Volume 11 (2025) SICOT-J, 11 (2025) E1 Full HTML
Open Access
Editorial
Issue
SICOT-J
Volume 11, 2025
Article Number E1
Number of page(s) 7
DOI https://doi.org/10.1051/sicotj/2025030
Published online 06 June 2025

© The Authors, published by EDP Sciences, 2025

Licence Creative CommonsThis is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Introduction

There are one billion musculoskeletal injuries worldwide each year [1]. The European Union had 2.7 million fragility fractures in 2017 for €37.7 billion annually, with a 27% increase expected by 2030 [2]. The US has over seven million orthopaedic injuries each year, usually caused by motor vehicle crashes, sports injuries, and occupational accidents, and this results in 3.6 million hospital visits, 800,000 inpatient stays, and 600,000 emergency surgeries annually [3]. Furthermore, with increasing life expectancies and aging populations, especially in Europe, North America, and Japan, the orthopaedic community will face multiple clinical challenges [1]. Effective control of post-operative pain, while minimizing opioid use, is a key goal of modern orthopaedic care (Fig. 1).

thumbnail Figure 1

Controlling pain and minimizing opioids is essential in orthopaedic surgery.

Intravenous (IV) magnesium infusions can be incorporated into multimodal analgesic regimens to enhance pain control and reduce reliance on opioids. Pain management following orthopaedic surgery is a critical aspect of patient care, as inadequate control of post-operative pain can impair recovery, increase the risk of complications, prolong hospital length of stay, and cost institutions thousands of dollars in excess care and expenses [4–12].

The cost of the opioid epidemic in the US has taken its toll on patients, their families, and communities. This epidemic is costing the US more than $78 billion a year [13, 14]. While the same crisis is not manifest in Europe up to now, the synthetic opioid crisis may be reaching its doorstep shortly [15]. This crisis, in addition to the recent shortage of medications for surgical theaters, has required anesthesiologists to search for non-opiate solutions for their institutions and practices [16].

Conventional analgesic strategies, including opioids and nonsteroidal anti-inflammatory drugs (NSAIDs), are commonly used but may be associated with significant side effects, such as sedation, respiratory depression, gastrointestinal complications, and an increased risk of dependency [17–20]. As a result, there is growing interest in adjunctive therapies that can enhance analgesic efficacy while minimizing adverse effects [21, 22]. Magnesium has been studied extensively and used in multiple post-operative settings [23–30], as well as in chronic, neuropathic, and migraine pain. Its application in pain control through its potential ability to limit the use of perioperative opioids in orthopaedic surgery should be seriously considered.

Magnesium sulfate properties of pain

Magnesium sulfate, administered via intravenous infusion, has emerged as a promising adjuvant in the management of post-operative pain. Intravenous magnesium sulfate has demonstrated effectiveness in reducing postoperative pain intensity, potentially decreasing the need for opioids, improving patient comfort, and reducing opioid side effects (e.g., nausea, constipation). Intravenous magnesium may also provide direct analgesia and reduce opioid-related complications through an opioid sparing effect [31–33]. Such infusions may also reduce the inflammatory response [34–36], which may delay recovery and contribute to further pain. Additionally, magnesium acts as a muscle relaxant [30, 37, 38], which may enhance surgical conditions, particularly in procedures requiring muscle relaxation such as hip arthroplasties, and may assist orthopaedic surgeons by providing significant muscle relaxation, allowing more effective intraoperative manipulation and reduction of spasms. Also, patients with chronic pain from various conditions may benefit from magnesium’s neuromodulatory effect [33, 39], particularly in conditions such as fibromyalgia and chronic postoperative pain syndromes.

More specifically, magnesium plays a vital role in modulating pain through its actions as a non-competitive antagonist of the N-methyl-D-aspartate (NMDA) receptor by blocking NMDA receptors in a voltage-dependent manner [40]. This NMDA antagonism is thought to reduce central sensitization, a key mechanism in acute and chronic pain. Magnesium also inhibits voltage-gated calcium channels, thereby decreasing neurotransmitter release (e.g., glutamate) and dampening nociceptive signaling [41]. This competition with calcium at the neuromuscular junction facilitates muscle relaxation and alleviates muscle tension or spasm. Furthermore, there is a downregulation of pro-inflammatory cytokines by magnesium (Tumor Necrosis Factor [TNF-α], Interleukin-6 [IL-6], and Interleukin beta 1 [IL-β1]), potentially minimizing postoperative pain and swelling [35, 42–46].

Magnesium infusions can be given before anesthetic induction, after anesthetic induction, intraoperatively, or postoperatively, depending on the protocol used, to mitigate intraoperative and postoperative pain [47] and may reduce the risk of developing chronic pain after surgery [12, 28, 48]. While magnesium infusions are generally safe [10], they require monitoring for side effects such as hypotension, bradycardia, and respiratory depression, especially in those with organ dysfunction [49].

Additionally, intraarticular and intrathecal injections of magnesium sulfate have also been used successfully as an adjunct to local anesthetics and other analgesics in lower and upper extremity surgeries, including hip arthroplasties, to reduce pain and narcotic use [7, 50–52]. Magnesium sulfate infusions can be an invaluable adjunct for pain control in orthopaedic patients, both on the wards and in the intensive care unit (Fig. 2). While intravenous magnesium sulfate infusion protocols vary, specific dosing strategies (Table 1) and related side effects (Table 2) for various orthopaedic procedures have been reported.

thumbnail Figure 2

Intravenous magnesium sulfate infusion in the operating room, intraoperatively, and postoperatively, can decrease the use of opioids.
Table 1

Dosing of magnesium sulfate in orthopaedic surgery.

Table 2

Side effects of magnesium sulfate. (DTRs: deep tendon reflexes; ECG: electrocardiogram; PTH: parathyroid hormone).

Magnesium sulfate efficacy in orthopaedic surgery

Multiple systematic reviews and meta-analyses on the value of magnesium as a pain adjuvant in orthopaedic surgery have been published [5, 6, 9, 30, 53, 54] (Table 3). Gormley et al. addressed the reduction of opioid use after orthopaedic surgery [53]. These authors’ impetus was to limit opioid use during the current, ongoing, and rapidly increasing opioid epidemic in North America [13, 14]. They reviewed 141 studies of 20,963 patients; 113 were randomized controlled trials (RCTs). While all the studies used multiple interventions to reduce opioid use after orthopaedic surgery, only 4/141 (2.8%) addressed magnesium sulfate use. The authors emphasized the need for a rigorous and consistent application of methodology to RCTs in orthopaedic pain control to enable a thoughtful and helpful evidence-based approach to pharmacologic and non-pharmacologic interventions in clinical practice. This was especially true as it applies to magnesium sulfate infusions.

Table 3

Summary of the most important published related studies on magnesium sulfate intravenous infusions in orthopaedic surgery. (IT: intrathecal; IV: intravenous).

Peng et al. screened 2350 articles and found 11 RCTs (N = 535 patients). Their review also addressed perioperative IV administration of magnesium sulfate in orthopaedic surgery [9]. Their findings in support of magnesium yielded mixed results. They reported that six of the trials demonstrated a reduction in pain intensity, while five studies did not. However, they did report a reduction of nausea, vomiting, and shivering with the use of magnesium sulfate. Sbitan et al. performed a narrative review to compare the intrathecal (IT) or IV administration of magnesium sulfate as a pain adjuvant in orthopaedic procedures [6]. They identified nine RCTs that addressed IT and IV administration of magnesium sulfate, but only three trials directly compared the IT vs. IV approach. Their conclusion in this regard, for both approaches, was that there is evidence for the efficacy of magnesium. However, the choice of the mode of administration remained a critical question.

Campos et al. published a recent systematic review on the safety and efficacy of magnesium in spinal surgery [30]. They reported that the neuroprotective and anti-inflammatory effects of magnesium, compared to steroids, caused a decrease in pain. In doing so, magnesium also significantly decreased opioid consumption. Hemodynamically, when compared to steroids, magnesium demonstrated a lower mean arterial pressure (which may be a surgical advantage). Furthermore, magnesium also lowered the consumption of muscle relaxants and enhanced the effect of vecuronium. This analysis also confirmed that magnesium can be used in combination with other medications or strategies to elicit synergistic effects. Finally, the authors conclude that there is no agreement in the scientific community on whether to use a bolus, bolus plus infusion, or infusion only. Loading doses, maintenance dosing, and protocols varied. Most loading doses were initiated intravenously just prior to anesthetic induction, and ranged from 30 to 50 mg/kg in saline, and infused over 10–30 min; maintenance infusions were administered continuously throughout the surgery at a rate of 10–20 mg/kg/h with few side effects.

Yue et al. performed a systematic review and meta-analysis of fourteen trials (781 patients) that reported the use of IV magnesium infusions during spinal surgery [54]. They determined that magnesium infusions reduced morphine consumption at 24 h compared to controls [55–60]. The systematic review and meta-analysis by Azimi et al. explored RCTs and magnesium use in total knee arthroplasties (TKA) [5]. They evaluated eight RCTs regarding pain management and analgesic use in 536 patients. They also found that within the first 24 h postoperatively, there was a significant decrease in opioid consumption, but low to moderate evidence of the use of magnesium intraoperatively for postoperative pain control in TKAs. These authors complained of the heterogeneity of studies, methods, dosing regimens, and routes of administration. They advocated for continued research to assist the surgical and critical care communities.

Conclusion

Despite some heterogeneity in study design, patient population, and dosing protocols, findings remain consistent. There is considerable evidence that magnesium infusions are effective in orthopaedic surgery, consistently demonstrating a reduction of postoperative opioid consumption and an improvement in pain scores when used in the first 24 h postoperatively. While it would be helpful to have further clinical studies with uniform methodological approaches (RCTs, surgery type, route of administration, dosing, etc.), and if possible, correlated with immunological (cytokine) findings, magnesium is becoming front and center for pain control in orthopaedic surgery. Multi-center trials examining the use of magnesium sulfate administration for pain control and reduced requests for analgesic medications in the perioperative period are worth pursuing. We encourage our colleagues in the surgical and anesthesiology communities to strongly consider adding magnesium sulfate infusions to their clinical pain armamentarium.

Funding

This research did not receive any specific funding.

Conflicts of interest

The authors declare that they have no relevant financial or non-financial interests to report.

Data availability statement

This article has no associated data generated.

Author contribution statement

Authors TJP, SMP, JA, PA and TS contributed to the conceptualization and methodology; authors TJP, SMP and JA contributed to the writing original draft; authors TS, PA, SL and AFM contributed to the visualization and investigation; authors TJP, SMP, TS, SL and AFM contributed to the supervision, writing and reviewing and editing or the paper.

Ethics approval

Ethical approval was not required.

Informed consent

This article does not contain any studies with human participants or animals performed by any of the authors.

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Cite this article as: Papadimos T, Pappada S, Alexander J, Altsitzioglou P, Saranteas T, Lustig S & Mavrogenis A (2025) Analgesia considerations in orthopaedic surgery: the role of magnesium sulfate infusions. SICOT-J 11, E1. https://doi.org/10.1051/sicotj/2025030.

All Tables

Table 1

Dosing of magnesium sulfate in orthopaedic surgery.

In the text
Table 2

Side effects of magnesium sulfate. (DTRs: deep tendon reflexes; ECG: electrocardiogram; PTH: parathyroid hormone).

In the text
Table 3

Summary of the most important published related studies on magnesium sulfate intravenous infusions in orthopaedic surgery. (IT: intrathecal; IV: intravenous).

In the text

All Figures

thumbnail Figure 1

Controlling pain and minimizing opioids is essential in orthopaedic surgery.
In the text
thumbnail Figure 2

Intravenous magnesium sulfate infusion in the operating room, intraoperatively, and postoperatively, can decrease the use of opioids.
In the text

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