Improving Radiographic Fracture Recognition Performance and Efficiency Using Artificial Intelligence.

Background Missed fractures are a common cause of diagnostic discrepancy between initial radiographic interpretation and the final read by board-certified radiologists. Purpose To assess the effect of assistance by artificial intelligence (AI) on diagnostic performances of physicians for fractures on radiographs. Materials and Methods This retrospective diagnostic study used the multi-reader, multi-case methodology based on an external multicenter data set of 480 examinations with at least 60 examinations per body region (foot and ankle, knee and leg, hip and pelvis, hand and wrist, elbow and arm, shoulder and clavicle, rib cage, and thoracolumbar spine) between July 2020 and January 2021. Fracture prevalence was set at 50%. The ground truth was determined by two musculoskeletal radiologists, with discrepancies solved by a third. Twenty-four readers (radiologists, orthopedists, emergency physicians, physician assistants, rheumatologists, family physicians) were presented the whole validation data set (n = 480), with and without AI assistance, with a 1-month minimum washout period. The primary analysis had to demonstrate superiority of sensitivity per patient and the noninferiority of specificity per patient at -3% margin with AI aid. Stand-alone AI performance was also assessed using receiver operating characteristic curves. Results A total of 480 patients were included (mean age, 59 years ± 16 [standard deviation]; 327 women). The sensitivity per patient was 10.4% higher (95% CI: 6.9, 13.9; P < .001 for superiority) with AI aid (4331 of 5760 readings, 75.2%) than without AI (3732 of 5760 readings, 64.8%). The specificity per patient with AI aid (5504 of 5760 readings, 95.6%) was noninferior to that without AI aid (5217 of 5760 readings, 90.6%), with a difference of +5.0% (95% CI: +2.0, +8.0; P = .001 for noninferiority). AI shortened the average reading time by 6.3 seconds per examination (95% CI: -12.5, -0.1; P = .046). The sensitivity by patient gain was significant in all regions (+8.0% to +16.2%; P < .05) but shoulder and clavicle and spine (+4.2% and +2.6%; P = .12 and .52). Conclusion AI assistance improved the sensitivity and may even improve the specificity of fracture detection by radiologists and nonradiologists, without lengthening reading time. Published under a CC BY 4.0 license. Online supplemental material is available for this article. See also the editorial by Link and Pedoia in this issue.

Beyond the sacro-Iliac joints: Vertebral involvement in axial spondylarthritis.

Imaging plays a central role in the diagnosis of axial spondylarthritis (axSpA). Commonly the sacroiliac joints are involved but vertebral involvement can occur in isolation in 1 out of 4 patients. Recognizing vertebral involvement patterns in axSpA can help establishing a diagnosis early and initiate therapy before irreversible changes have occurred. Magnetic resonance imaging (MRI) is considered the reference standard for early detection of inflammatory changes of the disease. Aims of this review are to present an overview of the imaging findings of vertebral involvement in axSpA, and to detail the current recommendations on the role of imaging in the diagnosis of axSpA in patients with isolated vertebral involvement.

Imaging of Gastrointestinal Tract Perforation.

Gastrointestinal tract perforation involving the stomach, duodenum, small intestine, or large bowel occurs as a result of full-thickness gastrointestinal wall injury with release of intraluminal contents into the peritoneal or retroperitoneal cavity. Most cases are associated with high mortality and morbidity, requiring urgent surgical evaluation. Initial patient presentations can be nonspecific with a broad differential, which can delay timely management. This article provides brief overviews of different causes of perforation. Various imaging modalities and protocols are discussed, along with direct and indirect imaging findings of perforation. Specific findings associated with different causes are also described to aid in the diagnosis.

Computed tomography (CT) in the evaluation of bladder and ureteral trauma: indications, technique, and diagnosis.

INTRODUCTION: Trauma to the genitourinary system includes blunt and penetrating injuries to bladder and ureters. These are rare injuries and are overlooked as other abdominal and pelvic injuries often take priority. Delayed diagnosis can lead to significant morbidity and mortality. Computed tomography has taken a central role in the imaging of the ureters and bladder. METHODS: This article reviews the anatomic relationships, mechanisms of injury, and clinical presentation to help physicians determine when bladder and ureteral injuries should be suspected and further imaging should be pursued. Radiologic evaluation of bladder and ureteral injury with CT cystography and CT urography, respectively, will be reviewed. CONCLUSION: CT cystography and CT urography are effective tools in identifying potentially serious injuries to the genitourinary system. Timely recognition of these injuries can be crucial for the overall management and prognosis.

Successful embolization of a enterocutaneous fistula tract with Onyx 34 following low anterior resection for rectal cancer.

Enterocutaneous fistulas (ECFs) can be one of the complications found after surgical intervention for rectal cancer. Interventional modalities consisting of surgical, endoscopic, and radiological methods are often implemented to treat postoperative symptomatic complications. We present the case of 61-year-old Caucasian man who presented to us with a recent diagnosis of rectal cancer that had invaded the levators as well as anteriorly into the prostate, and who underwent low anterior resection with a diverting loop ileostomy. The patient was found to have a persistent presacral abscess due to an ECF tract. This case highlights the off-label use of ethylene-vinyl alcohol copolymer dissolved in dimethyl sulfoxide (Onyx 34) to seal an ECF.

Vasculitic and autoimmune wounds.

OBJECTIVE: Chronic wounds are a major cause of morbidity and mortality. Approximately 20% to 23% of nonhealing wounds that are refractory to vascular intervention have other causes, including vasculitis, pyoderma gangrenosum, and other autoimmune diseases. The purpose of this article was to review the literature across medical and surgical specialties with regard to refractory chronic wounds associated with vasculitis and autoimmune diseases and to delineate clinical outcomes of these wounds in response to vascular and other interventions. METHODS: An electronic search encompassing MEDLINE, PubMed, Cochrane Library, and Scopus was completed using the following search terms: rheumatoid arthritis; systemic sclerosis; systemic lupus erythematosus; antineutrophil cytoplasmic antibody-associated vasculitis; mixed connective tissue disease; antiphospholipid syndrome; pyoderma gangrenosum; thromboangiitis obliterans; cryoglobulinemia; hydroxyurea; sickle cell; atrophie blanche; livedoid vasculitis; cholesterol emboli; calciphylaxis; antiphospholipid antibodies; prothrombotic; combined with the terms: chronic wound and leg ulcer. Full-text articles published in English up to March 1, 2016, that investigated the clinical outcomes of chronic wounds associated with autoimmune diseases were included. Review articles and evaluations of management of chronic wounds were also reviewed. Primary outcomes included in the review were amputation, ulcer healing, reduction in wound size, overall survival, and freedom from reintervention. Owing to the heterogeneity of data reporting among articles, qualitative analysis is also reported. RESULTS: Vasculitis and autoimmune diseases play a role in 20% to 23% of patients with chronic lower extremity ulcers. Furthermore, patients with autoimmune disease have a significantly high rate of split thickness skin graft failure (50% compared to 97% in patients without autoimmune disease; P = .0002). The management of leg ulcers associated with autoimmune diseases is discussed. CONCLUSIONS: Autoimmune and vasculitic causes should be considered in patients with chronic wounds who do not respond to appropriate vascular intervention and standard local wound care. A multidisciplinary approach with the involvement of rheumatologists allows investigation for underlying systemic disease and improves clinical outcomes for many of these challenging patients.