Commonly missed fractures in the Emergency Department
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1 Commonly missed fractures in the Emergency Department Poster No.: C-2327 Congress: ECR 2015 Type: Educational Exhibit Authors: A. A. Tegzes; Cluj-Napoca/RO Keywords: Education, Digital radiography, Conventional radiography, Emergency, Bones, Trauma, Acute, Education and training DOI: /ecr2015/C-2327 Any information contained in this pdf file is automatically generated from digital material submitted to EPOS by third parties in the form of scientific presentations. References to any names, marks, products, or services of third parties or hypertext links to thirdparty sites or information are provided solely as a convenience to you and do not in any way constitute or imply ECR's endorsement, sponsorship or recommendation of the third party, information, product or service. ECR is not responsible for the content of these pages and does not make any representations regarding the content or accuracy of material in this file. As per copyright regulations, any unauthorised use of the material or parts thereof as well as commercial reproduction or multiple distribution by any traditional or electronically based reproduction/publication method ist strictly prohibited. You agree to defend, indemnify, and hold ECR harmless from and against any and all claims, damages, costs, and expenses, including attorneys' fees, arising from or related to your use of these pages. Please note: Links to movies, ppt slideshows and any other multimedia files are not available in the pdf version of presentations. Page 1 of 27
2 Learning objectives The aim of this poster is to highlight the most commonly missed fractures in the Emergency Department, to identify situations that are high risk for an occult fracture and to review the radiographic signs that will reduce the misleading fractures. Page 2 of 27
3 Background In conventional radiology, missing fractures are a common diagnostic error in emergency. Radiography is the first step for detection of fractures. The detection of subtle signs of fracture requires a high standard for the acquisition technique and a thorough and systematic interpretation of radiographic images. Page 3 of 27
4 Findings and procedure details 1.WRIST Anatomy It is known that the carpal bones are divided into two rows: proximal and distal. The proximal carpal row is represented by the scaphoid, lunate, triquetrum, and pisiform while the distal carpal row is comprised of the trapezium, trapezoid, capitate, and hamate. The distance between carpal bones is less than 3 mm. Three smooth arches along carpal: a first arch that is a smooth curve outlining the proximal convexities of the scaphoid, lunate and triquetrum, a second arch that traces the distal concave surfaces of the same bones, and the third arch which follows the main proximal curvatures of the capitate and hamate. (Fig.1) Fig. 1: Plain radiography of the left wrist - posteroanterior view - X-ray anatomy of carpal bones. References: SCJU - UPU / Cluj-Napoca /RO Page 4 of 27
5 SCAPHOID FRACTURE The scaphoid is one of the most fractured carpal bone that occurs in young and middleaged adults. About 10% of the scaphoid fractures have associated fractures of other bones.the most frequently interest zones are: the radial styloid, but also triquetrum, capitates and perilunate fracture-dislocations. Approximately 1% of scaphoid fractures are bilateral. Mechanism: The mechanism of the injury is usually a fall on an outstretched hand (F.O.O.S.H.), with a dorsiflexion of the hand, but it also may include a direct impact. Exam: The patients present in the emergency room with a specific symptomatology as is the tenderness of the "anatomic snuffbox", pain at percussion over the scaphoid tubercle and pain in the snuffbox with the ulnar pronation of the wrist. X Ray: Sometimes the initially radiographs of a scaphoid fracture may appear normal. Patients with history of a fall on the outstretched hand that present with a pain in the snuffbox, should be orthopedically immobilized and sent for additional imaging studies. The radiologist technician should consider obtaining additional scaphoid views like a posteroanterior view of the wrist, with the wrist positioned in 45 degrees of ulnar deviation and pronated obliquely at 45 degrees. If clinically suspected, a scaphoid fracture should be treated as such even if the standard series of X-rays shows no fracture. Patients wrist should be orthopedically immobilized and followed up clinically in 10 days with repeat X-rays as required. The importance of the scaphoid fracture is due to the complications that can appear if the fracture is missed on X ray and if the patient does not receive immediately orthopedically treatment. The most frequent complications are avascular necrosis and the nonunion of the fracture. (Fig.2; Fig.3; Fig.4) Page 5 of 27
6 Fig. 2: Plain radiography of the left wrist - posteroanterior view - incomplete fracture of the scaphoid in a male pacient - 30 years old. References: SCJU - UPU / Cluj-Napoca /RO Page 6 of 27
7 Fig. 3: Plain radiography of the right wrist - posteroanterior view - incomplete fracture of the scaphoid in a female pacient - 61 years old. References: SCJU - UPU / Cluj-Napoca /RO Page 7 of 27
8 Fig. 4: Plain radiography of the left wrist - posteroanterior view - fracture of the scaphoid in a male pacient - 22 years old. References: SCJU - UPU / Cluj-Napoca /RO 2.ELBOW Anatomy The elbow joint is made up of three articulations : Radiohumeral:capitellum of the humerus with the radial head Ulnohumeral:trochlea of the humerus with the trochlear notch of the ulna Radioulnar: radial head with the radial notch of the ulna. (Fig.5) Page 8 of 27
9 Fig. 5: Lateral view of the left elbow - X-ray anatomy with normal fat pad. References: SCJU - UPU / Cluj-Napoca /RO RADIAL HEAD FRACTURE The radial head fractures are relatively common injuries, occurring in about 20% of all acute elbow injuries, especially in adults. Fractures of the radial head can be occult on radiographs. Mechanism: The mechanism of injury is usually a result of indirect trauma like a fall on an outstretched arm. Although,it could be a direct blow to the elbow that can cause a radial head fracture, but this is uncommon. Exam: Page 9 of 27
10 The patient presents in the emergency room with a swelling over the lateral side of the elbow and with limited range of motion: heavily forearm rotation and elbow extension. Xray: Standard radiographic evaluation of radial head fractures includes AP and lateral views of the elbow, although an oblique view is very frequently also obtained for better visualize the radial head. On the elbow x rays, the fat pads can be seen. They are collections of fat tissue adjacent to elbow joint capsule that appears as lucency on x rays. The anterior fat pad can be normal but if it is displaced and elevated, is pathologic and it is named "sail sign". If a posterior fat pad can be seen, that is abnormal and is an indirect sign of fracture. Often a non-displaced radial head fractures can be easily missed on plain films if there is no attention given to the indirect signs. (Fig.6; Fig.7). Fig. 6: Lateral view of the left elbow - subtle radial head fracture with sail sign present in a young female - 20 years old. References: SCJU - UPU / Cluj-Napoca /RO Page 10 of 27
11 Fig. 7: Lateral view of the left elbow - subtle radial head fracture with anterior sail sign and posterior fat pad in a young male - 23 years old. References: SCJU - UPU / Cluj-Napoca /RO 3.FOOT Anatomy The bones of the foot are divided into three categories: tarsal metatarsal phalanges. The tarsal bones of the foot are organised into three rows: Page 11 of 27
12 proximal: the talus and the calcaneus intermediate: the navicular distal: the cuboid and the three cuneiforms The forefoot contains the metatarsals and the phalanges. (Fig.8) Fig. 8: Lateral view of the left foot - X-ray anatomy. References: SCJU - UPU / Cluj-Napoca /RO CALCANEUS FRACTURE Page 12 of 27
13 The calcaneus is the most commonly fractured tarsal bone and accounts for about 2% of all fractures and ~60% of all tarsal fractures. Mechanism: Calcaneus fracture often result from falling from height but may be due to more trivial injury. Exam: The most common symptoms of a calcaneus fracture are: pain, bruising, swelling, heel deformity and inability to put weight on the heel or walk. Xray: Lateral X-rays of the calcaneus show Bohler's angle. Bohler's angle is the angle between two tangent lines drawn across the anterior and posterior borders of calcaneus in the lateral view. When Bohler's angle becomes less than 20 degrees it indicates a calcaneal fracture. The Bohler's angle is an angle seen on the lateral view of the foot. It is the angle between a line bordering the superior aspect of the posterior calcaneal tuberosity and the superior subtalar articular surface and a line crossing through the superior subtalar articular surface and the superior aspect of the anterior calcaneal process. The Bohler's angle is normally degrees.(fig.9; Fig.10) Page 13 of 27
14 Fig. 9: Lateral view of the left foot - normal Bohler's angle. References: SCJU - UPU / Cluj-Napoca /RO Page 14 of 27
15 Fig. 10: Lateral view of left foot - Bohler's angle - less than 20 degrees. References: SCJU - UPU / Cluj-Napoca /RO Page 15 of 27
16 Images for this section: Fig. 1: Plain radiography of the left wrist - posteroanterior view - X-ray anatomy of carpal bones. SCJU - UPU / Cluj-Napoca /RO Page 16 of 27
17 Fig. 2: Plain radiography of the left wrist - posteroanterior view - incomplete fracture of the scaphoid in a male pacient - 30 years old. SCJU - UPU / Cluj-Napoca /RO Page 17 of 27
18 Fig. 3: Plain radiography of the right wrist - posteroanterior view - incomplete fracture of the scaphoid in a female pacient - 61 years old. SCJU - UPU / Cluj-Napoca /RO Page 18 of 27
19 Fig. 4: Plain radiography of the left wrist - posteroanterior view - fracture of the scaphoid in a male pacient - 22 years old. SCJU - UPU / Cluj-Napoca /RO Page 19 of 27
20 Fig. 5: Lateral view of the left elbow - X-ray anatomy with normal fat pad. SCJU - UPU / Cluj-Napoca /RO Page 20 of 27
21 Fig. 6: Lateral view of the left elbow - subtle radial head fracture with sail sign present in a young female - 20 years old. SCJU - UPU / Cluj-Napoca /RO Page 21 of 27
22 Fig. 7: Lateral view of the left elbow - subtle radial head fracture with anterior sail sign and posterior fat pad in a young male - 23 years old. SCJU - UPU / Cluj-Napoca /RO Page 22 of 27
23 Fig. 8: Lateral view of the left foot - X-ray anatomy. SCJU - UPU / Cluj-Napoca /RO Page 23 of 27
24 Fig. 9: Lateral view of the left foot - normal Bohler's angle. SCJU - UPU / Cluj-Napoca /RO Page 24 of 27
25 Fig. 10: Lateral view of left foot - Bohler's angle - less than 20 degrees. SCJU - UPU / Cluj-Napoca /RO Page 25 of 27
26 Conclusion For the radiologist, good clinical skills are essential in order to avoid subtle fractures. Awareness of normal anatomic features is crucial in radiology to be able to detect indirect signs of fracture. A good and detailed anamnestic history, focusing on the mechanism of injury should reduce the number of missed fractures. Page 26 of 27
27 References 1. Mohamed Jarraya,1 Daichi Hayashi,1 FrankW. Roemer; Radiographically Occult and Subtle Fractures: A Pictorial Review; Radiology Research and Practice Volume 2013, Article ID Blake Reid Boggess, DO, FAAFP; Karl B Fields, MD. Anatomy and basic biomechanics of the wrist Carol A Boles, MD; William R Reinus, MD, Robert M Krasny, MD, Felix S Chew, MD, MBA, Scaphoid Fracture Imaging 6. Lauren A. Hackney and Seth D. Dodds, Assessment of scaphoid fracture healing Mar; 4(1): Nick Pappas, MD, Joseph Bernstein, MD. Fractures in Brief: Radial Head Fractures Page 27 of 27
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