RESUMO
STUDY DESIGN: Retrospective case series. OBJECTIVE: To identify specific magnetic resonance imaging (MRI) characteristics of epidural fluid collections associated with infection, hematoma, or cerebrospinal fluid (CSF). SUMMARY OF BACKGROUND DATA: Interpretation of postoperative MRI can be challenging after lumbar fusion. The purpose of this study was to identify specific MRI characteristics of epidural fluid collections associated with infection, hematoma, or CSF. METHODS: The study population includes consecutive patients between 2006 and 2010 who had MRIs performed within 2 weeks after elective surgery for evaluation of possible CSF fluid collection, hematoma, or infection. Patients with known previous infection (discitis/osteomyelitis) or inadequate MRIs were excluded from the study. Medical records were reviewed to determine the diagnosis (infection, hematoma, or pseudomeningocele) underlying the fluid collection. MRIs were retrospectively evaluated by a musculoskeletal radiologist and orthopedic spine attending who were blinded to the pathologic diagnosis for characteristics of the fluid collection. MRI characteristics include location of lesion: osseous involvement, disk location, anterior versus posterior versus anteroposterior, soft-tissue involvement, and iliopsoas involvement. Characteristics of the lesion include: volume of lesion, loculation, satellite lesions, multiple loci, destructive characteristics, and mass effect upon thecal sac. Enhancement was scored based upon the following variables: rim enhancement, smooth versus irregular, thin versus thick, heterogeneity, diffuse enhancement, nonenhancement, and rim thickness. General fluid collection intensity and complexity on T1, T2, and T1 postcontrast images was scored as high, medium, and low. The χ test was used to compare the incidence of imaging characteristics between patient groups (infection, hematoma, and CSF). RESULTS: Thirty-three patients were identified who met inclusion criteria. There were 13 (39%) with infection, 9 (27%) with hematoma, and 11 (33%) with CSF collection. Factors that were associated with infection were osseous involvement (R=0.392, P=0.024) and destructive characteristics (R=0.461, P=0.007). Factors that were correlated with hematoma include mass effect (R=0.515, P=0.002) and high T1-signal intensity (R=0.411, P=0.019), absence of thecal sac communication (R=-0.389, P=0.025), and absence of disk involvement (R=-0.346, P=0.048). Pseudomeningocele was associated with thecal sac communication (R=0.404, P=0.02), absence of mass effect (R=-0.48, P=0.005), low T1 signal (R=-0.364, P=0.04), and low T2 complexity (R=-0.479, P=0.005). CONCLUSION: Specific characteristics of the postoperative MRI can be used to distinguish infection from noninfectious fluid collections. The strongest predictors of infection were osseous involvement and destructive bony changes. Hematoma was associated with mass effect on the thecal sac, high T1-signal intensity, and absence of thecal sac communication and disk involvement. CSF collections were distinguished by absence of mass effect, low T2-signal complexity, low T1-signal intensity, and communication with the thecal sac.
Assuntos
Rinorreia de Líquido Cefalorraquidiano/diagnóstico por imagem , Hematoma Epidural Espinal/diagnóstico por imagem , Infecções/diagnóstico por imagem , Imageamento por Ressonância Magnética/métodos , Complicações Pós-Operatórias/diagnóstico por imagem , Adulto , Estudos de Casos e Controles , Rinorreia de Líquido Cefalorraquidiano/etiologia , Feminino , Hematoma Epidural Espinal/etiologia , Humanos , Processamento de Imagem Assistida por Computador , Infecções/etiologia , Masculino , Pessoa de Meia-Idade , Complicações Pós-Operatórias/etiologia , Estudos Retrospectivos , Traumatismos da Coluna Vertebral/cirurgiaRESUMO
PURPOSE: The aim of this study was to determine an association between fall-related hip and/or pelvic fractures and gluteus medius and minimus atrophy. METHODS: Retrospective review of 64 patients with fall-related hip/pelvic fractures and 96 age- and sex-stratified controls was performed. Gluteus medius, gluteus minimus, tensor fascia lata, and iliopsoas atrophy was scored using a standard scale. Statistical analysis was performed. RESULTS: There is a significant difference (P < 0.0001) in gluteus medius and minimus atrophy in the fracture versus control groups. Presence of gluteus atrophy was predictive of fall-related fracture (odds ratio, 2.15; 95% confidence interval, 1.08-4.31). There is no significant difference in tensor fascia lata (P = 0.47) or iliopsoas (P = 0.15) atrophy between the 2 groups. Gluteus atrophy increased with age (r = 0.41, P < 0.0001). In unilateral fractures, there is a significant difference (P = 0.0002) in ipsilateral versus contralateral gluteus medius atrophy. CONCLUSIONS: Gluteus medius and minimus muscle atrophy is greater in fall-related hip/pelvic fractures, which may predispose the elderly to falls.
Assuntos
Acidentes por Quedas/estatística & dados numéricos , Fraturas do Quadril/diagnóstico por imagem , Músculo Esquelético/diagnóstico por imagem , Atrofia Muscular/diagnóstico por imagem , Tomografia Computadorizada por Raios X , Idoso , Idoso de 80 Anos ou mais , Envelhecimento , Feminino , Quadril/diagnóstico por imagem , Fraturas do Quadril/complicações , Humanos , Masculino , Pessoa de Meia-Idade , Atrofia Muscular/complicações , Pelve/lesões , Estudos RetrospectivosRESUMO
Sports injuries at the knee are very common, not only in contact sports such as football but also in sports with jumping and pivoting. In addition, overuse injuries can affect the tendons, ligaments, and bone with degeneration, friction, and stress response. Radiologists and sports medicine professionals should be familiar with the range of injury occurring at the knee and patterns of injury that can be used to predict other more subtle pathology. These topics and others will be discussed.
Assuntos
Fraturas Ósseas/patologia , Fraturas de Cartilagem/patologia , Traumatismos do Joelho/patologia , Imageamento por Ressonância Magnética/métodos , Traumatismo Múltiplo/patologia , Lesões dos Tecidos Moles/patologia , Humanos , Aumento da Imagem/métodosRESUMO
Understanding of ankle injuries has evolved for the past few decades, influenced by capability to visualize ligaments, tendons, and bone marrow on magnetic resonance imaging (MRI). Natural history of injury progression, complications, and healing has also been characterized using MRI. Stress injury is particularly common at the ankle in athletes and "weekend warriors" alike. This article will discuss manifestations of ankle injury on MRI as well as associated findings that should be addressed.