Perioperative Protocol of Ankle Fracture and Distal Radius Fracture Based on Enhanced Recovery after Surgery Program: A Multicenter Prospective Clinical Controlled study

Background The enhanced recovery after surgery (ERAS) program is aimed to shorten patients' recovery process and improve clinical outcomes. This study aimed to compare the outcomes between the ERAS program and the traditional pathway among patients with ankle fracture and distal radius fracture. Methods This is a multicenter prospective clinical controlled study consisting of 323 consecutive adults with ankle fracture from 12 centers and 323 consecutive adults with distal radial fracture from 13 centers scheduled for open reduction and internal fixation between January 2017 and December 2018. According to the perioperative protocol, patients were divided into two groups: the ERAS group and the traditional group. The primary outcome was the patients' satisfaction of the whole treatment on discharge and at 6 months postoperatively. The secondary outcomes include delapsed time between admission and surgery, length of hospital stay, postoperative complications, functional score, and the MOS item short form health survey-36. Results Data describing 772 patients with ankle fracture and 658 patients with distal radius fracture were collected, of which 323 patients with ankle fracture and 323 patients with distal radial fracture were included for analysis. The patients in the ERAS group showed higher satisfaction levels on discharge and at 6 months postoperatively than in the traditional group (P < 0.001). In the subgroup analysis, patients with distal radial fracture in the ERAS group were more satisfied with the treatment (P=0.001). Furthermore, patients with ankle fracture had less time in bed (P < 0.001) and shorter hospital stay (P < 0.001) and patients with distal radial fracture received surgery quickly after being admitted into the ward in the ERAS group than in the traditional group (P=0.001). Conclusions Perioperative protocol based on the ERAS program was associated with high satisfaction levels, less time in bed, and short hospital stay without increased complication rate and decreased functional outcomes.

the MOS item short form health survey-36. Results. Data describing 772 patients with ankle fracture and 658 patients with distal radius fracture were collected, of which 323 patients with ankle fracture and 323 patients with distal radial fracture were included for analysis. e patients in the ERAS group showed higher satisfaction levels on discharge and at 6 months postoperatively than in the traditional group (P < 0.001). In the subgroup analysis, patients with distal radial fracture in the ERAS group were more satisfied with the treatment (P � 0.001). Furthermore, patients with ankle fracture had less time in bed (P < 0.001) and shorter hospital stay (P < 0.001) and patients with distal radial fracture received surgery quickly after being admitted into the ward in the ERAS group than in the traditional group (P � 0.001). Conclusions. Perioperative protocol based on the ERAS program was associated with high satisfaction levels, less time in bed, and short hospital stay without increased complication rate and decreased functional outcomes.

Introduction
Enhanced recovery after surgery (ERAS) is a multimodal, multidisciplinary approach for the care of the surgical patient based on published evidence, aiming to reduce physical and psychological stress and achieve rapid recovery [1]. is concept originated from gastrointestinal surgery in the late 20 th century. Previous studies have shown that the implementation of the ERAS clinical pathway shortens the length of hospital stay and reduces the medical costs, complications, and readmission, while satisfaction and safety after discharge are increased [2][3][4]. Due to the excellent clinical results, ERAS has rapidly adapted by other surgical fields, and several ERAS guidelines for gastrointestinal surgery, hepatobiliary surgery, urology, and obstetrics and gynecology have been introduced [5][6][7]. Nonetheless, ERAS started late in orthopedic trauma, and thus, the only welldeveloped ERAS pathway is for elderly hip fractures. A standard ERAS protocol for hip fractures in the elderly has been established in England; several studies have reported markedly shortened length of hospital stay and complications among these patients [8,9]. However, the perioperative protocol based on the ERAS program in managing other common fractures is still being explored.
Ankle and distal radial fractures are the two common fractures managed by orthopedic surgeons. Although indications for surgical intervention for the above two fracture types are well defined, the standard perioperative protocol based on the ERAS program remains unclear. Based on the updated ERAS guidelines of other operations, the perioperative pathways for ankle and distal radial fractures have been optimized in China, focusing on short perioperative fasting duration, minimally invasive approaches, minimizing drains and tubes, multimodal pain control, and early mobilization.
In this study, we compared the process and outcome measures between the ERAS and traditional pathways among the two target populations: patients with ankle fracture and distal radial fracture undergoing open reduction and internal fixation. us, we determined the effectiveness of the ERAS program.

Study Design and Participants.
is study was a prospective, multicenter clinical controlled study approved by the ethics committee of Beijing Jishuitan Hospital, Beijing, China (JST-201707-10, JST-201707-11). Written informed consent was obtained from patients before participation in the study. No financial compensation was provided to the participants. All centers partook voluntarily, and only centers with valid cases >5 were finally analyzed. Patients with a primary diagnosis of ankle fracture and distal radial fracture were enrolled between January 2017 and December 2018 in the centers included in this study. All patients were treated with open reduction and internal fixation. e inclusion criteria were as follows: (1) age between 16 and 70 years; (2) primary diagnosis of ankle fracture or distal radial fracture (combined with ulnar styloid fracture or distal ulnar fracture); (3) no serious systemic disease with a preoperative American Society of Anesthesiologists (ASA) classification I-II; (4) voluntary participation with informed consent. e exclusion criteria were as follows: (1) combined with other fractures; (2) old ankle fractures and distal radial fractures; (2) open fractures (excluding Gustilo type I); (3) diagnosis of diabetes mellitus or other severe metabolic diseases; (4) diagnosis of gastric emptying disorders; (5) alcohol dependence or history of drug abuse; (6) breastfeeding or pregnant women; (7) history of allergy to multiple drugs. e centers were considered ERAS centers if they had a multidisciplinary ERAS team and implemented the protocol described in this article. Data were collected at each center by a trained surgeon and deidentified before entry into an internet-based electronic case record form designed specifically for this study.

ERAS Pathway.
e ERAS pathway in this study was a standard perioperative protocol focusing mainly on pain management, perioperative fasting, and avoiding drains and urinary tubes. For pain management, we prescribed oral multimodal analgesics preoperatively and opioid-free analgesia based on nerve block postoperatively; a standard anesthesia protocol was followed for a painless procedure. For perioperative fasting, we minimized the fasting time as much as possible with low risks of pulmonary aspiration to reduce perioperative stress. For tubes management, urinary catheterization rate was reduced and meticulous hemostasis was achieved intraoperatively to avoid wound drains. e basic components of the multidisciplinary and multimodal ERAS pathway are listed in Table 1.

Process of Care Metrics.
We evaluated three ERAS perioperative care elements using the following process of care metrics. For perioperative fasting management, we evaluated the perioperative fasting period for solids and liquids. For perioperative time management, the elapsed time between admission and surgery, the elapsed time between injury and surgery, the length of operation, and the length of hospital stay were evaluated. For perioperative nonsurgical management, we assessed the use of regional anesthesia, nonsteroidal anti-inflammatory drugs (NSAIDS), patient-controlled analgesia (PCA), antiemetic, urinary catheterization, and wound drains.

Outcome Metrics.
Our primary outcome was the patients' satisfaction level of the whole treatment on discharge and at 6 months postoperatively. We divided the satisfaction into four levels A-D: A is the highest and D is dissatisfaction. e secondary outcomes include delapsed time between admission and surgery, elapsed time between injury and surgery, length of hospital stay, postoperative complications, and functional evaluation. Postoperative complications included loss of reduction, screw breakage by routine evaluation of postoperative radiographs, wound infection, deep vein thrombosis, and so on. American Orthopedic Foot and Ankle Society (AOFAS) ankle hindfoot scale and patientrelated wrist evaluation (PRWE) were used to evaluate the postoperative function of the injured ankle and wrist, respectively, at 6 months after surgery. For patients with ankle fracture, the postoperative time in bed was also recorded as the secondary outcome.

Statistical
Analysis. Statistical analysis was performed using IBM Statistical Package for Social Sciences Statistics (Version 22.0, IBM, Elmonck, New York, USA). All quantitative data were tested for normality using the Shapiro-Wilk test. e discrete variables were described as number and percentage, and the differences were compared using Fisher's exact or Pearson test. e continuous data were expressed as median (interquartile range (IQR)) and analyzed using the Wilcoxon rank-sum test. Multiple logistic regression analysis was conducted using patient demographic, injury, and perioperative management characteristics to identify the independent risk factors to assess the satisfaction level of the patients on discharge. P < 0.05 indicated statistical significance.

Demographic Characteristics.
e data of 772 patients with ankle fracture in 50 hospitals and 658 patients with distal radial fracture in 41 hospitals were collected ( Figure 1). Of these, 323 patients with ankle fracture in 12 hospitals and 323 patients with distal radial fracture in 13 hospitals were included for analysis. According to the centers where the surgery was performed, 181 (56.0%) patients with ankle fracture and 104 (32.2%) patients with distal radial fracture were treated using the ERAS perioperative protocol. e demographic characteristics of the included patients are shown in Table 2.

ERAS Process.
Most process metrics of the included patients demonstrated significant differences between the ERAS and the traditional groups. For perioperative fasting management, no significant difference was observed between the two groups in the perioperative fasting period for solids, but that for preoperative liquids (6.5 h vs. 13.8 h, P < 0.001) and postoperative solids (3.0 h vs. 5.5 h, P < 0.001) and liquids (1.5 h vs. 4.0 h, P < 0.001) of the ERAS group was significantly shorter than the traditional group. For perioperative time management, the elapsed time between admission and surgery, the length of operation, and hospital stay were shorter in the ERAS group than in the traditional group. For perioperative nonsurgical management, the ERAS group showed higher rate of regional anesthesia (88.07% vs. 49.58%, P < 0.001), antiemetic (83.86% vs. 73.41%, P � 0.001), and PCA (85.96% vs. 57.5%, P < 0.001) than in the traditional group. In the ERAS group, the patients went through less urinary catheterization than in the traditional group (3.86% vs. 8.59%, P < 0.016). e process of care metrics is shown in Table 3.

Satisfaction Level.
e satisfaction levels between the ERAS and the traditional groups were significantly different at discharge and 6 months postoperatively. e patients in the ERAS group had higher satisfaction level than in the traditional group (Table 4).    (Table 5).

Distal Radial Fracture.
Among patients with distal radial fracture, the distribution of the elapsed time between admission and surgery and levels of satisfaction at 6 months postoperatively differed significantly. Patients in the ERAS group had a shorter time between admission and surgery and were more satisfied with the treatment both at discharge and at 6 months postoperatively than those in the traditional group. No difference was noted in the other demographic, medical, injury, and operative characteristics between the two groups (Table 6).

Ankle
Fracture. Among patients with ankle fracture, the time in bed (1.0 vs 1.4 days, P < 0.001) and the length of hospital stay (8 vs. 9 days, P < 0.001) were significantly shorter in the ERAS group compared to the traditional group, while no difference was observed in the distribution of the satisfaction levels at discharge and 6 months postoperatively between two groups. Also, no difference was detected in the other demographic, medical, injury, and operative characteristics between the two groups ( Table 7).

Discussion
is multicenter prospective cohort study collected the data of 772 patients with ankle fracture across 50 hospitals and 658 patients with distal radial fracture from 41 hospitals and analyzed 323 patients among each population. Pain management, perioperative fasting, and avoiding tubes in the ERAS protocol are the three main constituents. We prescribed multimodal analgesia and minimal fasting time and strived to achieve meticulous hemostasis to reduce wound drains.
e results showed satisfactory adherence to the ERAS protocol and demonstrated that the patients in the ERAS group had a higher satisfaction level at discharge and at 6 months postoperatively compared to the traditional group. We also found that age, regional anesthesia, PCA, preoperative fasting period for solids, postoperative fasting period for solids and liquids, the length of operation, and urinary catheterization were independent predictors for the satisfaction level of the patients at the time of discharge. In addition, the ERAS protocol reduced the time in bed and length of hospital stay in ankle fracture patients and elapsed time between admission and surgery in patients with distal radial fracture while maintaining similar early functional outcomes of those treated in the traditional manner and without increasing the rate of complications. ese results suggested that the ERAS perioperative protocol was a valuable approach in the management of ankle and distal radial fractures.
Nonetheless, ERAS programs often need a multidisciplinary team that provides a multimodal approach to resolving issues that delay recovery and cause complications based on published evidence. Although the protocol might consist of several elements, one aim is common: minimizing stress and improving the response to stress [1]. ERAS is safe and effective and has been proven to achieve rapid recovery  e principles are developed best in colorectal surgery [10,11]. However, the implementation of ERAS programs has also demonstrated satisfying outcomes in many other surgical domains [12][13][14]. In orthopedic surgery, clinical studies have mainly focused on arthroplasty [15][16][17]. ERAS principles in orthopedic trauma have begun very late, and the only well-developed ERAS pathway is for elderly hip fractures [8,9,[18][19][20][21]. Kang et al. [9] compared the outcomes of intertrochanteric fracture patients treated in the ERAS pathway to those treated traditionally and found that the protocol reduced the length of hospital stay and preserved hip function without compromising the functional outcomes. Talboys et al. [20] reviewed 100 patients who underwent hemiarthroplasty for a fractured femoral neck retrospectively and concluded that the ERAS program reduces the postoperative oral opiates and PCA requirements. Macfie et al. [21] suggested multimodal optimization as the ERAS principle was associated with a decline in postoperative morbidity in patients with proximal femoral fracture. Due to various surgical options and the high incidence of orthopedic trauma, establishing a scientific, evidence-based ERAS protocol of common fractures is challenging but essential. erefore, the present study aimed to assess the value of the ERAS principles in common fractures.
is study has several strengths compared to previous studies. First, a large number of patients were enrolled in this study. However, we included 646 patients from different provinces of China, which is a larger sample size than other similar studies [8,20,21]. Second, unlike most studies involving ERAS principles in fracture patients, we conducted a prospective study, significantly reducing the risk of information bias. ird, the application of ERAS principles in common fractures other than hip fractures was evaluated for the first time. We included patients with ankle and distal radial fractures as the target population to assess the application of ERAS principles in common fractures because a slight difference was detected between the functional aims and therapeutic strategies of fractures in the upper and lower limbs. Furthermore, the primary outcome of our study was the satisfaction level of the patients at 6 months postoperatively. It is a subjective, patient-oriented evaluation, reflecting the perioperative experience and the short-term functional outcomes of the patients.
Nevertheless, the present study has some limitations. Firstly, the perioperative care was not assigned randomly, which might increase selection bias. Secondly, although there is a standard care protocol for each group, perioperative management may not be homogeneous among different centers because we cannot rule out individualized therapeutic options and measurement errors of some researchers. irdly, we only focused on three care elements without assessing the influence of other care elements, such as fluid management and rehabilitation protocol, on patients with common fractures. Lastly, we only evaluated short-term functional outcomes, and additional studies are necessary to   Pain Research and Management assess the long-term effect of the ERAS program on patients with orthopedic trauma.
In conclusion, this study established the perioperative protocol based on the ERAS program with high satisfaction among patients with distal radial fracture and ankle fracture, less time in bed, and short hospital stay without increased complication rate and decreased functional outcomes. us, we recommend the ERAS protocol in the management of patients with ankle and distal radial fractures.
Data Availability e data and materials could be acquired upon request to the corresponding author via e-mail.