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Open Access

Cost and safety of inpatient versus outpatient open reduction internal fixation of isolated ankle fractures

Nicholas Pasic, Jason Akindolire, Laura Churchill, Silvio Ndoja, Christopher Del Balso, Abdel-Rahman Lawendy, Brent Lanting and Ryan M. Degen
CAN J SURG April 08, 2022 65 (2) E259-E263; DOI: https://doi.org/10.1503/cjs.016420
Nicholas Pasic
From the Division of Orthopedic Surgery, Department of Surgery, Western University, London, Ont. (Pasic, Akindolire, Ndoja, Del Balso, Lawendy, Lanting, Degen); and the Fowler Kennedy Sport Medicine Clinic, Western University, London, Ont. (Churchill, Degen)
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Jason Akindolire
From the Division of Orthopedic Surgery, Department of Surgery, Western University, London, Ont. (Pasic, Akindolire, Ndoja, Del Balso, Lawendy, Lanting, Degen); and the Fowler Kennedy Sport Medicine Clinic, Western University, London, Ont. (Churchill, Degen)
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Laura Churchill
From the Division of Orthopedic Surgery, Department of Surgery, Western University, London, Ont. (Pasic, Akindolire, Ndoja, Del Balso, Lawendy, Lanting, Degen); and the Fowler Kennedy Sport Medicine Clinic, Western University, London, Ont. (Churchill, Degen)
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Silvio Ndoja
From the Division of Orthopedic Surgery, Department of Surgery, Western University, London, Ont. (Pasic, Akindolire, Ndoja, Del Balso, Lawendy, Lanting, Degen); and the Fowler Kennedy Sport Medicine Clinic, Western University, London, Ont. (Churchill, Degen)
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Christopher Del Balso
From the Division of Orthopedic Surgery, Department of Surgery, Western University, London, Ont. (Pasic, Akindolire, Ndoja, Del Balso, Lawendy, Lanting, Degen); and the Fowler Kennedy Sport Medicine Clinic, Western University, London, Ont. (Churchill, Degen)
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Abdel-Rahman Lawendy
From the Division of Orthopedic Surgery, Department of Surgery, Western University, London, Ont. (Pasic, Akindolire, Ndoja, Del Balso, Lawendy, Lanting, Degen); and the Fowler Kennedy Sport Medicine Clinic, Western University, London, Ont. (Churchill, Degen)
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Brent Lanting
From the Division of Orthopedic Surgery, Department of Surgery, Western University, London, Ont. (Pasic, Akindolire, Ndoja, Del Balso, Lawendy, Lanting, Degen); and the Fowler Kennedy Sport Medicine Clinic, Western University, London, Ont. (Churchill, Degen)
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Ryan M. Degen
From the Division of Orthopedic Surgery, Department of Surgery, Western University, London, Ont. (Pasic, Akindolire, Ndoja, Del Balso, Lawendy, Lanting, Degen); and the Fowler Kennedy Sport Medicine Clinic, Western University, London, Ont. (Churchill, Degen)
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Abstract

Background: As health care shifts to value-based models, one strategy within orthopedics has been to transition appropriate cases to outpatient or ambulatory settings to reduce costs; however, there are limited data on the efficacy and safety of this practice for isolated ankle fractures. The purpose of this study was to compare the cost and safety associated with inpatient versus outpatient ankle open reduction internal fixation (ORIF).

Methods: All patients who underwent ORIF of isolated closed ankle fractures at 2 affiliated hospitals between April 2016 and March 2017 were identified retrospectively. Demographic characteristics, including age, gender, comorbidities and injuryspecific variables, were collected. We grouped patients based on whether they underwent ankle ORIF as an inpatient or outpatient. We determined case costing for all patients and analyzed it using multivariate regression analysis.

Results: A total of 196 patients (125 inpatient, 71 outpatient) were included for analysis. Inpatients had a significantly longer mean length of stay than outpatients (54.3 h [standard deviation (SD) 36.3 h] v. 7.5 h [SD 1.7 h], p < 0.001). The average cost was significantly higher for the inpatient cohort than the outpatient cohort ($4137 [SD $2285] v. $1834 [SD $421], p < 0.001). There were more unimalleolar ankle fractures in the outpatient group than in the inpatient group (42 [59.2%] v. 41 [32.8%], p < 0.001). Outpatients waited longer for surgery than inpatients (9.6 d [SD 5.6 d] v. 2.0 d [SD 3.3 d], p < 0.001). Fourteen patients (11.2%) in the inpatient group presented to the emergency department or were readmitted to hospital within 30 days of discharge, compared to 5 (7.0%) in the outpatient group (p = 0.3).

Conclusion: In the treatment of isolated closed ankle fractures, outpatient surgery was associated with a significant reduction in length of hospital stay and overall case cost compared to inpatient surgery, with no significant difference in readmission or reoperation rates. In medically appropriate patients, isolated ankle ORIF can be performed safely in an ambulatory setting and is associated with significant cost savings.

Ankle fractures represent one of the most common orthopedic injuries, accounting for about 10% of all musculoskeletal injuries1,2 and more than half of all foot and ankle injuries.1–3 International trends suggest that the incidence of ankle fractures will continue to rise along with an increasing average population age.4 A considerable proportion of ankle fractures are ultimately managed surgically with open reduction internal fixation (ORIF). Ankle ORIF can be performed on an inpatient or outpatient basis. Conventionally, inpatient ORIF is seen as the standard of care for patients who have experienced polytrauma with concomitant injuries and open fractures, and those with multiple medical comorbidities. However, for patients with isolated closed ankle fractures with few medical comorbidities, treatment pathways are often poorly defined. Hospital admission is frequently required to facilitate treatment if access to ambulatory operating room time is not readily available. This availability issue may be more prevalent in Canada and other publicly funded health care systems, where the use of private surgicentres is less common.

The decision regarding inpatient versus outpatient ORIF has important financial implications5 that are particularly relevant in the current health care climate, with an increasing focus on cost-effectiveness and bundled payments for surgical procedures.6 Canada remains one of the biggest spenders in health care in the Organisation for Economic Co-operation and Development: in 2019, health care spending reached 11.6% of the gross domestic product, or almost $7000 per person.7 In addition, nursing inpatient services represent almost 20% of hospital spending in Canada.7 This is the largest share of hospital spending by functional area and thus a rationale for favouring outpatient over inpatient surgery whenever feasible.

There is ample evidence supporting the safety and efficacy of outpatient surgery in different orthopedic procedures, including total joint arthroplasty and spine surgery,8–10 but there is a relative paucity of evidence in the setting of orthopedic trauma or foot and ankle surgery. Neither of the studies that we identified were conducted in a publicly funded single-payer health care system.11,12 As such, we aimed to compare the cost and resource use associated with inpatient and outpatient ankle ORIF at a Canadian academic tertiary care institution. In addition, we aimed to report on the safety and appropriateness of outpatient care by reporting on postoperative emergency department visits, readmissions and 30-day complications, as well as reoperation rates. We hypothesized that outpatient ankle surgery is a cost-effective and safe option for isolated closed ankle fractures.

Methods

After obtaining approval from the Western University Delegated Health Sciences Research Ethics Board, we performed an electronic chart review to identify our study cohort. We identified all patients who underwent ORIF for an acute ankle fracture at 1 of 2 hospitals between April 2016 and March 2017. The inclusion criteria included all isolated closed ankle fractures that underwent ORIF of a lateral malleolus, bimalleolar or trimalleolar fracture. The exclusion criteria included open fracture, polytrauma, bilateral ankle fractures, and fractures requiring temporary external fixation or a staged procedure owing to traumatic soft-tissue swelling or injuries.

We grouped patients based on whether they were treated surgically as an inpatient or outpatient. Patients treated as outpatients present to the hospital from home the day of surgery and return home that same day after meeting criteria for safe discharge. The decision as to inpatient versus outpatient treatment was made at the discretion of the treating surgeon, largely dependent on access to ambulatory operating room time and patient comorbidities. At 1 of the 2 hospitals, patients with ankle fractures are typically managed as inpatients, whereas at the other, there is a slight predilection to manage these patients as outpatients owing to greater availability of ambulatory operating room time. Both hospitals are capable of providing both inpatient and outpatient care.

Preoperative patient characteristics collected included age, sex, body mass index and American Society of Anesthesiologists (ASA) score. Operative and postoperative data, including preoperative consultations from other services (medicine or anesthesia), time to surgery, operating time and length of hospital stay, were also recorded. Charts were screened for postoperative complications, readmissions and emergency department visits within 30 days after surgery.

Statistical analysis

We compared variables between the inpatient and outpatient groups using a 2-sample t test for continuous variables and χ2 test for multiple categoric variables. Continuous variables were expressed as mean and standard deviation (SD), and categoric variables, including 30-day readmissions and return emergency department visits, were reported as absolute values and percentages. We assessed the effect of inpatient versus outpatient status on 30-day readmissions and return emergency department visits both using a 2-sample t test and via a logistic regression analysis.

Results

A total of 196 patients were included for analysis, 125 in the inpatient group and 71 in the outpatient group. The demographic and clinical characteristics of the 2 groups are presented in Table 1. There were no differences between groups in age, body mass index or ASA score. The inpatient cohort had a higher proportion of females than the outpatient cohort (75 [60.0%] v. 31 [43.7%], p = 0.03).

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Table 1

Demographic and clinical characteristics of patients who underwent open reduction internal fixation of acute ankle fracture as an inpatient or outpatient

Surgical variables for the 2 groups, including fracture pattern and number of malleoli requiring ORIF, time to surgery, operating time and length of hospital stay, as well as 3-day readmissions and postoperative complications, are summarized in Table 2. The outpatient group had a greater proportion of isolated unimalleolar injuries and a smaller proportion of bimalleolar or trimalleolar injuries (p < 0.001). The mean operating time was 9 minutes shorter in the outpatient group than in the inpatient group (50.4 [SD 27.8] min v. 59.8 [SD 23.6] min, p < 0.001). The mean length of stay was sevenfold greater in the inpatient group than in the outpatient group (54.3 [SD 36.3] h, v. 7.5 [SD 1.7] h, p < 0.001). The mean cost associated with inpatient surgery was significantly greater than that for outpatient surgery ($4137 [SD 2285] v. $1834 [SD 421], p < 0.001). However, those in the outpatient group were 1 week further removed from their injury at the time of surgery than those in the inpatient group (9.6 [SD 5.6] d v. 2.0 [SD 3.3] d, p < 0.001).

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Table 2

Surgical variables, outcomes and costs

There was a nonsignificant trend toward a higher 30-day readmission rate in the inpatient group than in the outpatient group (3.2% v. 0.0%, p = 0.3). Four patients, all in the inpatient group, were readmitted. Two patients required revision ankle ORIF, 1 required irrigation and débridement for infection, and 1 required medical management of Clostridioides difficile colitis. The most common reasons for return to the emergency department were pain control, cast concerns and wound concerns.

Discussion

Use of health care resources continues to be a large focus as care shifts to value-based models. Within orthopedics, one strategy has been to transition appropriate cases to outpatient or ambulatory settings as an increasingly popular method of providing cost-effective care. There is literature to support this strategy across orthopedic subspecialties, including arthroplasty, spine surgery, and foot and ankle surgery.8–11,13–17 Patient-reported outcomes, satisfaction rates and complication rates comparable to those in the inpatient setting have been reported, in addition to substantial cost savings. The findings of the present study are similar: outpatient ankle ORIF was associated with a significantly shorter length of hospital stay, cost savings of more than 50%, and no difference in postoperative complications compared to inpatient ankle ORIF, despite a longer period from initial injury to surgery. As such, we conclude that outpatient ankle ORIF represents a safe, cost-effective option for management of isolated closed ankle fractures. Unimalleolar ankle fractures seem particularly amenable to outpatient surgery based on the observed low complication rates in this subcategory.

In this retrospective cohort study, there was an average savings of $2303 per case associated with outpatient surgery. Furthermore, the mean length of hospital stay was more than 7 times greater for the inpatient cohort than for the outpatient cohort. This is important in today’s medical climate, with the increasing use of bundled payments, as well as the relative scarcity of available inpatient beds that many single-payer public health care hospitals face. In a 2001 study from the United Kingdom, James and colleagues18 determined costs accrued by admitted patients with ankle fractures awaiting surgery. After adjustment for inflation, the cost per day of an acute trauma bed was Can$560. Therefore, before arrival in the operating room, inpatients in our study accumulated over $1000 more in costs than outpatients with regard to surgical inpatient services alone. On the other hand, it is worth considering the costs associated with increased time between the initial injury and definitive surgery in the outpatient group. In our study, on average, outpatients underwent surgery more than 9 days after their fracture, which was 1 week later than the inpatient cohort, and delayed their recovery and ability to return as a productive member of the workforce.

Our findings are consistent with those of studies conducted in the US. Bettin and colleagues11 reported that costs were more than 31.6% lower with outpatient versus inpatient surgery in the treatment of isolated ankle fractures at a level 1 trauma hospital. In a retrospective review of a large insurance claims database, Malik and colleagues12 identified even greater cost savings, almost 41%, in the outpatient surgery group. In addition, multiple studies have shown rates of revision surgery and complications associated with hospital admission for ankle ORIF that are equal to or higher than those for outpatient surgery, which provides further support for outpatient management.13,14,16–18 Furthermore, there is ample evidence that outpatient surgery is not only safe and cost-effective, but is also associated with outcomes that are at least equivalent to those with inpatient surgery.4,14,19,20 Retrospective analysis of a National Surgical Quality Improvement Program database showed that patients who had isolated ankle fracture repair performed as an outpatient procedure had lower overall complication rates than inpatient cohorts.8 Similarly, a retrospective study evaluating 256 outpatient and 226 inpatient ankle ORIF procedures over a 5-year period at a US level 1 trauma centre showed a threefold decrease in the rate of postoperative complications and of unplanned surgical revisions in the outpatient group.17 The trauma centre had a well-established institutional protocol of managing isolated ankle fractures on an outpatient basis, with defined care pathways to facilitate access to ambulatory operating room resources.

If a paradigm shift is to occur in treating isolated closed ankle fractures, judicious patient selection will be required. Fractures in patients with multiple comorbidities, high ASA scores or high-energy mechanisms, and those with residual displacement after attempted reduction would be more amenable to inpatient surgery.21–23 In a recent Canadian study, Wolfstadt and colleagues19 reported on the development of an outpatient care pathway in ambulatory fracture surgery. Over 2 years, interventions put into place increased the proportion of patients managed as outpatients substantially, from 1.6% to 89.1%. That study illuminated some of the difficulties associated with providing outpatient care. Most notably, education tailored to allied health care professionals in the postanesthesia care unit and the emergency department was crucial to implementation of this change. In addition, policy changes regarding the logistics of booking outpatient cases, as well as increased access to an urgent daytime operating room were important initiatives. Until outpatient surgery centres become readily available in Canada, there will continue to be a need to streamline outpatient fracture procedures.

Limitations

This study was a retrospective review, and the decision to manage as an inpatient or outpatient was made by the treating surgeon. Consequently, the results may not be generalizable to all patients, as there may be those with comorbidities or grossly unstable fracture patterns who are not fit for discharge and outpatient treatment. In addition, the results are limited to 2 hospitals; however, this ensures the accuracy of the costing data and comparable surgical decision-making between sites. The results are limited to financial implications and complication rates associated with inpatient versus outpatient surgery; the study did not consider functional outcome measures. In addition, the societal implications of delayed treatment, thereby delaying recovery, by 1 week are unknown. Future studies should include this additional time in their costing models to evaluate whether it carries any significant implications.

Conclusion

In the treatment of isolated closed ankle fractures in a publicly funded, single-payer health care system, outpatient surgery was associated with a significant reduction in length of hospital stay and overall case cost compared to inpatient surgery. In addition, there was a nonsignificant trend toward fewer return visits to the emergency department or readmission within 30 days of discharge with outpatient surgery. In medically appropriate patients, isolated ankle ORIF can be performed on an outpatient basis as it represents a safe and economically superior alternative to inpatient treatment.

Footnotes

  • Competing interests: None declared.

  • Contributors: S. Ndoja, A.-R. Lawendy, B. Lanting and R. Degen designed the study. N. Pasic, J. Akindolire, S. Ndoja, C. Del Balso and A.-R. Lawendy acquired the data, which N. Pasic, J. Akindolire, L. Churchill, C. Del Balso and A.-R. Lawendy analyzed. N. Pasic wrote the manuscript, which all authors critically revised. All authors gave final approval of the article to be published.

  • Accepted March 17, 2021.

This is an Open Access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY-NC-ND 4.0) licence, which permits use, distribution and reproduction in any medium, provided that the original publication is properly cited, the use is noncommercial (i.e., research or educational use), and no modifications or adaptations are made. See: https://creativecommons.org/licenses/by-nc-nd/4.0/.

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Canadian Journal of Surgery: 65 (2)
CAN J SURG
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Cost and safety of inpatient versus outpatient open reduction internal fixation of isolated ankle fractures
Nicholas Pasic, Jason Akindolire, Laura Churchill, Silvio Ndoja, Christopher Del Balso, Abdel-Rahman Lawendy, Brent Lanting, Ryan M. Degen
CAN J SURG Apr 2022, 65 (2) E259-E263; DOI: 10.1503/cjs.016420

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Cost and safety of inpatient versus outpatient open reduction internal fixation of isolated ankle fractures
Nicholas Pasic, Jason Akindolire, Laura Churchill, Silvio Ndoja, Christopher Del Balso, Abdel-Rahman Lawendy, Brent Lanting, Ryan M. Degen
CAN J SURG Apr 2022, 65 (2) E259-E263; DOI: 10.1503/cjs.016420
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