• Users Online: 599
  • Print this page
  • Email this page


 
 
Table of Contents
ORIGINAL ARTICLE
Year : 2021  |  Volume : 10  |  Issue : 2  |  Page : 92-96

Wisconsin criteria and necessity for computed tomography in patients with maxillofacial trauma: A diagnostic value study


1 Department of Radiology, Faculty of Medicine, Kashan University of Medical Sciences, Kashan, Iran
2 Department of Surgery, Faculty of Medicine, Kashan University of Medical Sciences, Kashan, Iran
3 Social Determinants of Health Research Center, Kashan University of Medical Sciences, Kashan, Iran
4 Dentist, Private Dental Clinic, Shiraz, Iran
5 Trauma Research Center, Kashan University of Medical Sciences, Kashan, Iran

Date of Submission26-Nov-2020
Date of Decision21-Feb-2021
Date of Acceptance11-Apr-2021
Date of Web Publication28-Jun-2021

Correspondence Address:
Dr. Mehrdad Mahdian
Trauma Research Center, Kashan University of Medical Sciences, Kashan
Iran
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/atr.atr_109_20

Get Permissions

  Abstract 


Background and Objectives: Wisconsin criteria have already been introduced to diagnosis maxillofacial fractures and reduce unnecessary computed tomography (CT) and as a result radiation exposure. Given that its use in different centers has had different results, this study tries to investigate the diagnostic value of these criteria in a Level III trauma center. Methods: Over the study period, all patients with facial trauma presenting to the hospital emergency evaluated for the study eligibility criteria. Maxillofacial CT in all patients was performed. A senior radiology resident who was blinded to the study reviewed the CT images. The diagnostic value of the Wisconsin criteria, including correct classification (CC), sensitivity (SEN) and specificity (SP), and positive and negative predictive values (NPV) was calculated. Results: A total of 300 patients most of whom were injured in traffic accidents (74%) met the inclusion criteria; most of whom were men (90.7%). The mean age of the patients was 33 years. The highest diagnostic value of the Wisconsin criteria is in identifying fractures in the frontal region with a CC of 80.2%. The SP and positive predictive value (PPV) of Wisconsin criteria at the cutoff point of 2 was 85.7% and 87.1%, respectively. SEN and NPV were obtained 23.9% and 21.8%, respectively. Conclusions: Regarding poor obtained SEN and NPV and the not so high SP and PPV of the test, our study could not validate Wisconsin criteria for predicting facial fractures. It seems that these criteria are institutionally dependent and cannot be generalized to all medical centers.

Keywords: Computed tomography, diagnostic value, fracture, maxillofacial, X-Ray


How to cite this article:
Talari HR, Moussavi N, Hoseinzadeh A, Akbari H, Shaghaghi T, Mahdian M. Wisconsin criteria and necessity for computed tomography in patients with maxillofacial trauma: A diagnostic value study. Arch Trauma Res 2021;10:92-6

How to cite this URL:
Talari HR, Moussavi N, Hoseinzadeh A, Akbari H, Shaghaghi T, Mahdian M. Wisconsin criteria and necessity for computed tomography in patients with maxillofacial trauma: A diagnostic value study. Arch Trauma Res [serial online] 2021 [cited 2021 Jul 29];10:92-6. Available from: https://www.archtrauma.com/text.asp?2021/10/2/92/319584




  Introduction Top


Maxillofacial fractures are usually caused by high-energy accidents, especially traffic collisions and generally, 24% of trauma victims suffer from facial injuries.[1] These injuries, if mismanaged, can lead to permanent asymmetry, facial disfigurement, jaw injuries, and enophthalmos.[2],[3],[4],[5],[6]

At present, computed tomography (CT) is the imaging modality of choice when assessing a traumatic facial injury and can demonstrate a 100% sensitivity (SEN) in detecting a fracture.[7],[8],[9],[10],[11],[12] However, proper physical examinations for early detection and triage of facial findings are crucial.

In the past, physical examination was the first step by which a physician evaluated a patient with facial trauma[13] and certain physical examination findings were related to the presence of zygomatic,[12],[14],[15],[16] orbital,[8],[12],[13],[16] maxillary,[12],[14],[16],[17] mandibular[12],[18],[19],[20] and nasal fractures.[12],[21] However, these findings have not been systematically tested against CT scans to determine which findings are significantly more predictive of facial bone fractures in trauma patients.

The use of CT scans in the world has increased dramatically since 1980.[22],[23] In many treatment centers, patients often undergo a CT scan before receiving a full physical examination by a physician.[20],[24] The use of CT scans in patients who are less likely to have facial bone fractures due to trauma can lead to over-imaging, unwarranted radiation exposure and ultimately a marked increase in costs. In fact, about 30% of CT scans performed are unnecessary.[25] In addition, increased radiation exposure increases the risk of cancer, especially in children.[23],[25],[26],[27]

Based on these facts about overusing of radiological imaging, several other studies have developed valid diagnostic tools to reduce unnecessary imaging. One such study was conducted in 1993 with the Ottawa Ankle Rules, which evaluated a number of clinical signs to assess ankle bone injuries.[28] These methods showed a positive predictive value (PPV) of 100% for fracture diagnosis, thereby reducing the use of X-ray radiography by one-third. Furthermore, by reducing the use of unnecessary imaging techniques, the treatment costs of exposure to unnecessary radiation were reduced.

According to a multi-center study conducted in 2009,[29] each CT scan of the head emits about 2 mSv per scan, which is ten times more than the amount of radiation received from a typical X-ray image. Not only CT delivers much higher radiation doses than do conventional diagnostic X-rays but also patients often have multiple CT scan on admission. A study by Mettler et al.[30] reported that one-third of patients who underwent abdominal and pelvic CT scans received more than 3 scans and about 4% received more than 9 scans and many of them had multiple scans on the same day.

In 2011, the “Wisconsin criteria” were established as a guide in determining which patients would benefit from facial CT scan.[31] This study demonstrated a SEN of 98.2% in diagnosing facial fracture if ≥one of the following five clinical findings were positive: (1) Bony step-off/instability, (2) periorbital swelling/contusion, (3) Glasgow Coma Scale (GCS) score <14, (4) malocclusion, and (5) tooth absence. The same authors had a follow-up study with internal validation showing 97.4% SEN.[32] Unfortunately, an attempt of external validation by Harrington et al.[33] showed 81% SEN and 60% negative predictive value (NPV), raising concerns for the widespread use of this criteria.

Since the diagnostic indicators such as SEN and specificity (SP) in this case are rather controversial, and there is no general agreement about their diagnostic value regarding facial fractures, the current study was designed to prospectively test the diagnostic value of the Wisconsin Criteria including correct classification (CC), SEN, SP, PPV, and NPV as compared to CT scan (as the gold standard) in patients with facial traumas.


  Methods Top


Study design and inclusion criteria

The Kashan University of Medical Sciences (KAUMS) institutional review board approved this prospective diagnostic study before commencement (Ethical code: IR.KAUMS.MEDNT.REC.1396.38). Between February 2018 and January 2019, all patients with facial trauma who admitted to the Kashan Shahid Beheshti Hospital (affiliated to KAUMS) emergency department evaluated for study eligibility criteria. Patients were excluded if they had active facial infection, facial palsy, history of past facial plastic surgery, mental status changes that led them unable to answer to physician's questions or if they have been admitted ≥7 days following the initial trauma. Patients also who were unable to give informed consent for any reason, such as endotracheal intubation, were excluded from the study.

Physical examination form

In the emergency department, all patients who had facial trauma were examined by a single emergency medicine specialist and the Wisconsin criteria[31] were calculated based on their physical examination.

Wisconsin criteria

In 2011, the “Wisconsin criteria” were established as a guide in determining which patients would benefit from facial CT scan. The mentioned study demonstrated a SEN of 98.2% in diagnosing facial fracture if ≥1 of the following five clinical findings were positive: (1) bony step-off/instability, (2) periorbital swelling/contusion, (3) GCS score <14, (4) malocclusion, or (5) tooth absence.[31]

Radiologic imaging

Maxillofacial CT in all patients was performed from the skull apex caudally to the mandible. Serial axial images were obtained at 2.5 mm slices. Coronal and sagittal reformations were routinely performed. A senior radiology resident who was blinded to the physical examination results reviewed the original CT images. All fractures of the mandibular, maxillary, nasal, orbital, zygomatic, and frontal bone areas were systematically classified based on the diagnostic schemes proposed in the literature.[34]

Statistical analysis

A previously published set of physical examination findings, known as the “Wisconsin criteria” was used to test how accurate this tool is in our own study population. Using the CT findings as the gold standard, major facial areas in the CT and “Wisconsin criteria” were compared. A review of all patients fulfilling the inclusion criteria was performed, which assessed the following five criteria: Bony step off, periorbital swelling, GCS score <14, dental malocclusion, and tooth absence. The percent agreement between these results and the true CT findings were subsequently calculated.

True positive (TP), true negative (TN), false positive (FP), and false negative (FN) values were calculated to determine the diagnostic value indices such as CC, SEN, SP, NPV and PPV, and area under the curve (AUC) for these five criteria in detecting facial fractures along with 95% confidence intervals (CI) (95% CI).(CC= (TP + TN)/all cases, SEN = TP/TP + FN, SP = TN/TN + FP, PPV = TP/TP + FP and NPV = TN/TN + FN). Statistical significance was determined by a P < 0.05.


  Results Top


During the study period, a total of 300 patients met the inclusion criteria; most of whom were men (90.7%). The mean age of the patients was 33 ± 16 years. The most common mechanism of injury was road traffic accidents (74%) [Table 1]. Regarding Wisconsin criteria, the diagnostic value of frontal fractures had the highest accuracy among other maxillofacial fractures with a CC of 80.1% [Table 2]. The SP and PPV of Wisconsin criteria at the cut-off point of 2 for whole face is 85.7% and 87.1%, respectively. In other words, cases with facial trauma who have a Wisconsin score of at least 2 are 87.1% more likely to have a fracture in at least one area of their face. On the other hand, people with no facial fracture had an 85.7% chance of having a Wisconsin criteria <2. The highest diagnostic value of the Wisconsin criteria is in identifying fractures in the frontal region. The 96.4% of cases with a Wisconsin score lower than 2, are less likely to have a frontal fracture. Furthermore, cases with a Wisconsin score of <1 do not have an 80.4%, 92.2%, and 88.2% chance of nasal, orbital, and zygomatic fractures, respectively. However, cases with an orbital fracture are 86.2% more likely to have a Wisconsin score of more than 1. The diagnostic value of Wisconsin criteria in diagnosing fractures of at least one area of the face is not very high (AUC = 0.55) and the highest diagnostic power is related to frontal fractures (AUC = 0.713), followed by maxillary (AUC = 0.68) and orbital fractures (0.679). The results of [Table 3] show that the best cutoff point for a total facial fracture is 2 and for each of the facial components is 1 [Table 3].
Table 1: Demographic and injury variables of the study cases

Click here to view
Table 2: Correct classification of Wisconsin criteria versus computed tomography scan regarding different maxillofacial fractures

Click here to view
Table 3: Diagnostic characteristics of Wisconsin criteria for the diagnosis of maxillofacial fractures

Click here to view



  Discussion Top


This study set out with the aim of assessing the ability of Wisconsin criteria to diagnosing facial fractures. In general, this study showed regarding the PPV of 87.1%, the patients with a Wisconsin score of at least 2, are 87.1% more likely to have a fracture in at least one area of their face.

Although in the past the examination of trauma patients relied more on physical examination, in recent years, there has been an excessive reliance on CT scan to diagnose fractures in maxillofacial trauma patients. The use of CT scans for all patients burdens a high cost on both the patient and the national health system. Furthermore, improper use of CT scan leads to the patient receiving unnecessary radiation. Therefore, in an attempt to minimize unnecessary CT scan use, several other studies have attempted to demonstrate the predictive value of certain physical examination findings.

In the retrospective study by Sitzman et al.,[31] “Wisconsin” criteria were emerged as predictors for ordering facial CT imaging. In their study, they found the SEN and NPV of these criteria in the diagnosis of facial bone fractures 98.2% and 87.8%, respectively. Validation of these criteria by Sitzman et al.[32] and Stewart et al.[35] was consistent with the reference study (SEN = 97.4% and NPV = 81.3). However, recently there have been contradicting reports regarding the utility of these criteria in decision-making. A validation study by Harrington et al.[33] failed to do so on account of low SEN and NPV (SEN = 81% and NPV = 60%).

Understanding the differences in both study type and instrument purpose, we attempted to examine how the Wisconsin criteria would perform at our institution. Our demographic was similar to Sitzman's group regarding age, male predominance, and trauma mechanism. In the present study, different diagnostic value was obtained for different facial bones. For example, when applied retrospectively, the “Wisconsin criteria” were 86.2% and 76.9% sensitive in diagnosing of orbital and zygomatic fractures, respectively. The NPV for ruling out of orbital and zygomatic fractures was 92.2 and 88.2%, respectively. The present findings seem to be consistent to some extent with Sitzman et al. and Stewart's studies.[31],[32],[35] However, our study, despite its relatively high SP (85.7%) and PPV (87.1%), had SEN of 23.9% and NPV of 21.8% in diagnosing facial bone fractures as a whole. Nevertheless, having relatively high PPV, according to our results, it could be concluded cases with facial trauma who have a Wisconsin score of at least 2 are 87.1% more likely for having at least one facial bone fracture.

There are several possible explanations for the inconsistency of our results with previously mentioned studies. A possible explanation for this might be that, in Sitzman's study finding was considered positive if it was confirmed by any one of different practitioners examining the patients while in our study, examining the patients and filling the checklists was performed by a one physician. On the other hand, we know that when the SEN or NPV is high, it means that the FN is low. Another possible explanation for this discrepancy might be related to differences between devices in different centers. The use of older CT-scan devices may increase the number of FNs and affect diagnostic value tests. In reference studies for validating Wisconsin criteria, the CT scan images were reviewed by multiple board-certified radiologists, while in the present study, a senior radiology resident was responsible for interpreting the images. On the other hand, since the PPV depends on two factors, SEN and prevalence, due to the low SEN, the high prevalence of fractures can be considered as the reason for the higher PPV. Differences in the nature of the traumas in different areas can also be a reason for the discrepancy of the results too. For example, we had no penetrating trauma among of our cases.


  Conclusion Top


Our study could to some extent validate Wisconsin criteria for predicting facial fractures. Our results showed that the best cutoff point for a total facial fracture is 2 and for each of the facial components is 1.

These criteria may be medical center specific and may not be generalizable to other centers. It is suggested that further multicenter studies be performed to determine criteria for diagnosing maxillofacial fractures and avoiding over-imaging to improve resource allocation.

Acknowledgment

The authors would like to thank Deputy of research of KAUMS for its financial support in this study (Grant no: 96095).

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
  References Top

1.
Yu BH, Han SM, Sun T, Guo Z, Cao L, Wu HZ, et al. Dynamic changes of facial skeletal fractures with time. Sci Rep 2020;10:4001.  Back to cited text no. 1
    
2.
Timashpolsky A, Dagum AB, Sayeed SM, Romeiser JL, Rosenfeld EA, Conkling N. A prospective analysis of physical examination findings in the diagnosis of facial fractures: Determining predictive value. Plast Surg (Oakv) 2016;24:73-9.  Back to cited text no. 2
    
3.
Exadaktylos AK, Sclabas GM, Smolka K, Rahal A, Andres RH, Zimmermann H, et al. The value of computed tomographic scanning in the diagnosis and management of orbital fractures associated with head trauma: A prospective, consecutive study at a level I trauma center. J Trauma 2005;58:336-41.  Back to cited text no. 3
    
4.
Christensen BJ, Mercante DE, Neary JP, King BJ. Risk factors for severe complications of operative mandibular fractures. J Oral Maxillofac Surg 2017;75:787.e1- 787.e8.  Back to cited text no. 4
    
5.
Modabber A, Rana M, Ghassemi A, Gerressen M, Gellrich NC, Hölzle F, et al. Three-dimensional evaluation of postoperative swelling in treatment of zygomatic bone fractures using two different cooling therapy methods: A randomized, observer-blind, prospective study. Trials 2013;14:238.  Back to cited text no. 5
    
6.
Linnau KF, Stanley RB Jr., Hallam DK, Gross JA, Mann FA. Imaging of high-energy midfacial trauma: What the surgeon needs to know. Eur J Radiol 2003;48:17-32.  Back to cited text no. 6
    
7.
van Hout WM, Van Cann EM, Muradin MS, Frank MH, Koole R. Intraoperative imaging for the repair of zygomaticomaxillary complex fractures: A comprehensive review of the literature. J Craniomaxillofac Surg 2014;42:1918-23.  Back to cited text no. 7
    
8.
Sohns JM, Staab W, Sohns C, Schwarz A, Streit U, Hosseini AS, et al. Current perspective of multidetector computed tomography (MDCT) in patients after midface and craniofacial trauma. Clin Imaging 2013;37:728-33.  Back to cited text no. 8
    
9.
Peterson BE, Doerr TD. Utility of computed tomography scans in predicting need for surgery in nasal injuries. Craniomaxillofac Trauma Reconstr 2013;6:221-4.  Back to cited text no. 9
    
10.
Birgfeld CB, Mundinger GS, Gruss JS. Evidence-based medicine: Evaluation and treatment of zygoma fractures. Plast Reconstr Surg 2017;139:168e-80e.  Back to cited text no. 10
    
11.
Naeem A, Gemal H, Reed D. Imaging in traumatic mandibular fractures. Quant Imaging Med Surg 2017;7:469-79.  Back to cited text no. 11
    
12.
Jurkiewicz MJ, Nickell WB. Fractures of the skeleton of the face. A study of diagnosis and treatment based on twelve years' experience in the treatment of over 600 major fractures of the facial skeleton. J Trauma 1971;11:947-58.  Back to cited text no. 12
    
13.
Schouman T, Courvoisier DS, Van Issum C, Terzic A, Scolozzi P. Can systematic computed tomographic scan assessment predict treatment decision in pure orbital floor blowout fractures? J Oral Maxillofac Surg 2012;70:1627-32.  Back to cited text no. 13
    
14.
Neovius E, Fransson M, Persson C, Clarliden S, Farnebo F, Lundgren TK. Long-term sensory disturbances after orbitozygomatic fractures. J Plast Reconstr Aesthet Surg 2017;70:120-6.  Back to cited text no. 14
    
15.
Strong EB, Sykes JM. Zygoma complex fractures. Facial Plast Surg 1998;14:105-15.  Back to cited text no. 15
    
16.
Mueller CK, Zeiß F, Mtsariashvili M, Thorwarth M, Schultze-Mosgau S. Correlation between clinical findings and CT-measured displacement in patients with fractures of the zygomaticomaxillary complex. J Craniomaxillofac Surg 2012;40:e93-8.  Back to cited text no. 16
    
17.
Oliveira-Campos GH, Lauriti L, Yamamoto MK, Júnior RC, Luz JG. Trends in le fort fractures at a South American trauma care center: Characteristics and management. J Maxillofac Oral Surg 2016;15:32-7.  Back to cited text no. 17
    
18.
Schwab RA, Genners K, Robinson WA. Clinical predictors of mandibular fractures. Am J Emerg Med 1998;16:304-5.  Back to cited text no. 18
    
19.
Marchena JM, Padwa BL, Kaban LB. Sensory abnormalities associated with mandibular fractures: Incidence and natural history. J Oral Maxillofac Surg 1998;56:822-5.  Back to cited text no. 19
    
20.
Thai KN, Hummel RP 3rd, Kitzmiller WJ, Luchette FA. The role of computed tomographic scanning in the management of facial trauma. J Trauma 1997;43:214-7.  Back to cited text no. 20
    
21.
Gharehdaghi J, Samadi Rad B, Ghatreh Samani V, Kolahi F, Khatami Zonoozian A, Marashian SM. Comparison of physical examination and conventional radiography in diagnosis of nasal fracture. Indian J Otolaryngol Head Neck Surg 2013;65:304-7.  Back to cited text no. 21
    
22.
Bhargavan M. Trends in the utilization of medical procedures that use ionizing radiation. Health Phys 2008;95:612-27.  Back to cited text no. 22
    
23.
Brenner DJ, Hall EJ. Computed tomography – An increasing source of radiation exposure. N Engl J Med 2007;357:2277-84.  Back to cited text no. 23
    
24.
Holmgren EP, Dierks EJ, Assael LA, Bell RB, Potter BE. Facial soft tissue injuries as an aid to ordering a combination head and facial computed tomography in trauma patients. J Oral Maxillofac Surg 2005;63:651-4.  Back to cited text no. 24
    
25.
Sun Z, Ng KH, Vijayananthan A. Is utilisation of computed tomography justified in clinical practice? Part 1: Application in the emergency department. Singapore Med J 2010;51:200-6.  Back to cited text no. 25
    
26.
Huang WY, Muo CH, Lin CY, Jen YM, Yang MH, Lin JC, et al. Paediatric head CT scan and subsequent risk of malignancy and benign brain tumour: A nation-wide population-based cohort study. Br J Cancer 2014;110:2354-60.  Back to cited text no. 26
    
27.
Brenner DJ, Elliston CD. Estimated radiation risks potentially associated with full-body CT screening. Radiology 2004;232:735-8.  Back to cited text no. 27
    
28.
Stiell IG, Greenberg GH, McKnight RD, Nair RC, McDowell I, Reardon M, et al. Decision rules for the use of radiography in acute ankle injuries. Refinement and prospective validation. JAMA 1993;269:1127-32.  Back to cited text no. 28
    
29.
Smith-Bindman R, Lipson J, Marcus R, Kim KP, Mahesh M, Gould R, et al. Radiation dose associated with common computed tomography examinations and the associated lifetime attributable risk of cancer. Arch Intern Med 2009;169:2078-86.  Back to cited text no. 29
    
30.
Mettler FA Jr., Wiest PW, Locken JA, Kelsey CA. CT scanning: Patterns of use and dose. J Radiol Prot 2000;20:353-9.  Back to cited text no. 30
    
31.
Sitzman TJ, Hanson SE, Alsheik NH, Gentry LR, Doyle JF, Gutowski KA. Clinical criteria for obtaining maxillofacial computed tomographic scans in trauma patients. Plast Reconstr Surg 2011;127:1270-8.  Back to cited text no. 31
    
32.
Sitzman TJ, Sillah NM, Hanson SE, Gentry LR, Doyle JF, Gutowski KA. Validation of clinical criteria for obtaining maxillofacial computed tomography in patients with trauma. J Craniofac Surg 2015;26:1199-202.  Back to cited text no. 32
    
33.
Harrington AW, Pei KY, Assi R, Davis KA. External validation of university of Wisconsin's clinical criteria for obtaining maxillofacial computed tomography in trauma. J Craniofac Surg 2018;29:e167-70.  Back to cited text no. 33
    
34.
Büttner M, Schlittler FL, Michel C, Exadaktylos AK, Iizuka T. Is a black eye a useful sign of facial fractures in patients with minor head injuries? A retrospective analysis in a level I trauma centre over 10 years. Br J Oral Maxillofac Surg 2014;52:518-22.  Back to cited text no. 34
    
35.
Stewart CN, Wood L, Barta RJ. Validation of the “Wisconsin Criteria” for obtaining dedicated facial imaging and its financial impact at a level 1 trauma center. Craniomaxillofac Trauma Reconstr 2020;13:4-8.  Back to cited text no. 35
    



 
 
    Tables

  [Table 1], [Table 2], [Table 3]



 

Top
 
  Search
 
    Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
    Access Statistics
    Email Alert *
    Add to My List *
* Registration required (free)  

 
  In this article
Abstract
Introduction
Methods
Results
Discussion
Conclusion
References
Article Tables

 Article Access Statistics
    Viewed304    
    Printed4    
    Emailed0    
    PDF Downloaded29    
    Comments [Add]    

Recommend this journal