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Traumatic Injuries of the Foot and Ankle

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Traumatic Injuries of the Foot and Ankle Henry Ford Health System Henry Ford Health System Scholarly Commons Orthopaedics Articles Orthopaedics / Bone and Joint Center 1-1-2021 Traumatic Injuries of the Foot and Ankle Alexander D. Grushky Sharon J. Im Scott D. Steenburg Suzanne Chong Follow this and additional works at: https://scholarlycommons.henryford.com/orthopaedics_articles Traumatic Injuries of the Foot and Ankle Alexander D. Grushky, MD,*, Sharon J. Im, MD,†, Scott D. Steenburg, MD, FASER,z and Suzanne Chong, MD, MS, FASERx Introduction operative subset averaged 69 weeks until return to work, with an average cost of injury of $65,384.8 he pathologies involving the foot and ankle in the emer- Timely recognition of these injuries allows for early treat- T gency setting are widely ranging and vary from traumatic ment and minimizes the risk of complications related to fractures to soft tissue/joint infection. The ankle is the most delayed or missed diagnosis. Knowledge of mechanism and frequently injured major weight-bearing joint in the body, patterns of injury can aid in the detection of subtle or unsus- with lateral ankle sprains representing the most common pected injuries that impact management. injury in the musculoskeletal system.1,2 Fractures of the ankle and foot account for 9% and 10% of all fractures, respectively1,3; a review of the National Trauma Data Bank between 2007 and 2011 revealed 280,933 fracture-disloca- Imaging Technique tions of the foot and/or ankle4 and a population-based study found an incidence of 168.7/100,000/year, with lateral mal- The recommended initial imaging evaluation of patients with leolus fractures representing 55% of fractures.5 Common suspected acute traumatic injuries to the foot and ankle con- causes of injury range from trauma, eg, motor vehicle acci- sists of standard 3 view radiographs (Reference 2 ACR- dents and sports injury, to osteoporosis.6 Appropriateness Criteria: Acute Trauma to Ankle, and Foot). In addition to the physical and emotional effects of an Standard radiographic evaluation of the foot consists of ante- injury, there are also significant financial implications, with rior-posterior (AP), lateral, and oblique views. The lateral ankle sprains costing an average of $318-$914 per sprain.7 view of the foot allows evaluation of the talocalcaneal relation ’ 1 In a review of calcaneal fractures sustained by industrial (Bohler s angle, Critical angle of Gissane). For the ankle, the workers, the average total cost and time from injury to return standard views are AP, lateral, and mortise. The ankle mor- to work was estimated for operative and nonoperative frac- tise view allows for evaluation of the tibial plafond and tibio- tures. The nonoperative subset averaged 18 weeks until talar congruence. Accurate and thorough descriptions of return to work, with an average cost of $14,230, while the fractures are important to guide appropriate management; Tables 1 and 2 outline descriptors of fractures and associated Abbreviations: ATFL, Anterior Talofibular Ligament; PTFL, Posterior findings, respectively. Talofibular Ligament; CFL, Calcaneofibular Ligament; AITFL, Anterior Additional views of the foot and ankle can be helpful for Inferior Tibiofibular Ligament; PITFL, Posterior Inferior Tibiofibular elucidating injuries. Weight-bearing views of the foot are fi Ligament; TTFL, Transverse Tibio bular Ligament; IOL, Interosseous required if there is suspicion for injury to the Lisfranc liga- Ligament; IOM, Interosseous Membrane; MCS, Medial Clear Space; fi fi ment complex, as nonweight-bearing views may miss or TCS, Tibio bular Clear Space; TFO, Tibio bular Overlap; aTFD, 9 Anterior Talofibular Distance underestimate injury. Ankle stress views can be employed *Division of Emergency Radiology, Department of Radiology, University of to better detect medial clear space widening due to deltoid Michigan, Ann Arbor, MI. fi y ligamentous injury in the setting of distal bular fracture. Department of Sports Medicine, Henry Ford Hospital, Detroit, MI. z Stress can be applied via manual external rotation; however, Department of Radiology and Imaging Sciences, Indiana University School of Medicine and Indiana University Health, Indianapolis, IN. this results in additional radiation exposure to the person x Emergency Radiology Division, Department of Radiology and Imaging applying the stress and can cause discomfort to the patient. Sciences, Indiana University School of Medicine and Indiana University Gravity stress views, with the patient in lateral decubitus Health, Indianapolis, IN. position, a wedge under the calf of the injured side, and fl Con icts of Interest: None. views obtained with 10⁰-15⁰ internal rotation, have been Address reprint requests to Alexander D. Grushky, MD, Division of Emergency Radiology, Department of Radiology, University of shown to be as effective in detecting medial clear space wid- Michigan, Taubman Center, TC B1-132K, 1500 E. Medical Center ening in the setting of an isolated fibular fracture and are bet- 1,10-13 Drive, Ann Arbor, MI 48109. E-mail: [email protected] ter tolerated by patients. https://doi.org/10.1053/j.ro.2020.09.003 47 0037-198X/© 2021 Elsevier Inc. All rights reserved. Downloaded for Anonymous User (n/a) at Henry Ford Hospital / Henry Ford Health System (CS North America) from ClinicalKey.com by Elsevier on March 05, 2021. For personal use only. No other uses without permission. Copyright ©2021. Elsevier Inc. All rights reserved. 48 A.D. Grushky et al. Table 1 Important Descriptors of Osseous Fractures1 medicine has almost no role in characterizing acute foot and ankle traumatic injuries but can be useful to evaluate for Site of fracture and extent of involvement stress fractures and to distinguish between cellulitis vs septic Alignment of fracture fragments (overriding, displacement) Direction of fracture line (transverse, oblique) arthritis. Joint aspiration remains the gold standard for con- fi 1 Special or associated features (comminution, dislocation) rming joint infection. Special type of fracture (Maisonneuve, Lisfranc) Open vs closed Involvement of growth plates in the pediatric population Ankle Anatomy Table 2 Indirect Signs of Osseous Injury1 The ankle is comprised of the distal tibia, fibula, and talus, while the ankle joint is formed by the tibiotalar, distal tibio- Soft tissue swelling, obliteration of adjacent fat stripes fibular, and talofibular articulations. The tibiotalar and talo- Periosteal/endosteal reaction fi “ ” Joint effusion (+/- intracapsular fat-fluid level) bular articulations together are considered the true ankle Double cortical line joint and are referred to as the talocrural joint. The lateral Cortical buckling malleolus is the distal extension of the fibula, and the medial Metaphyseal corner irregularity malleolus is the distal extension of the tibia. The fibular inci- sion (“incisura fibula” or “peroneal groove”) is located along the lateral aspect of the distal tibia and represents the articu- Computed tomography (CT) is superior to radiography for lating face of the tibia at the distal tibiofibular joint. While depicting the severity of comminution, intra-articular exten- usually concave with 1-7.5 mm of depth, the fibular incision sion, displacement and angulation of fractures. In the acute varies widely between individuals, with some demonstrating setting, CT is reserved for patients in whom clinical suspicion a convex appearance, which may increase the risk of malre- for fracture persists despite normal radiographs or for preop- duction in the setting of ankle fractures.22 The tibiotalar and erative planning.1 CT has been shown to be superior to talofibular joints are responsible for motion in the sagittal radiographs for the evaluation of distal tibiofibular syndes- plane, with 23⁰-48⁰ plantarflexion and 10⁰-23⁰ dorsiflexion.9 motic injury,14 and allows for better detection and descrip- The ligaments of the ankle can be grouped into 3 ligamen- tion of fractures involving the Tillaux-Chaput tubercle and tous complexes: lateral collateral, medial collateral, and syn- posterior malleolus.15 In the setting of a Lisfranc injury, CT desmotic. The lateral collateral ligament complex (Fig. 1) is often required to fully characterize and identify all frac- includes the anterior and posterior talofibular (ATFL/PTFL) tures.1 For cases of suspected musculoskeletal infection, CT and calcaneofibular (CFL) ligaments. The ATFL functions to performed with intravenous iodinated contrast is useful to resist inversion, anterior translation, and internal rotation. evaluate for extent of infection, given its ability to depict The CFL acts as a stabilizer against inversion forces and pro- cross-sectional and compartmental anatomy.17 While the vides stability to the talocrural and subtalar joints. The PTFL role of dual-energy CT in the musculoskeletal system has largely been reserved for detection of urate deposits in patients with gout, there is increasing evidence supporting the use of dual-energy CT for metal artifact reduction and detection of bone marrow edema.16,17 Magnetic resonance imaging (MRI) is superior to CT for the evaluation of soft tissue structures, can detect marrow edema, and is more sensitive and specific than nuclear medicine scin- tigraphy for the evaluation of infection.1 MRI can depict purely ligamentous injury and allows for detailed assessment of the extent of soft tissue infection and injury given its inherently high contrast and good spatial resolution.1 However, MRI is less widely available, particularly after hours in the emergent setting, and is a more expensive
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