Pelvis radiographs in children with cerebral palsy: effects of patient positioning on calculating migration percentages.

BACKGROUND: Hip displacement in children with cerebral palsy (CP) is monitored by measuring migration percentage on anteroposterior pelvis radiographs. However, proper positioning for radiography in children with spasticity is difficult. The reliability and accuracy of migration percentage as a function of patient positioning is unknown. OBJECTIVE: To determine the effects of patient positioning on migration percentage measurements in children with CP. MATERIALS AND METHODS: We identified children with CP (≤18-year-old) with pelvis CT and anteroposterior pelvis radiograph obtained <6 months apart (10/2018-11/2021). Digitally reconstructed radiographs were generated from each pelvis CT, to simulate nine different patient positions: neutral; 10° and 20° lordosis and kyphosis; and 10° and 20° right rotation and left rotation. Two radiologists measured migration percentages from the simulated and real pelvis radiographs. We used Spearman's rho to assess inter-rater reliability, and Wilcoxon signed rank test to determine statistical significance. RESULTS: We studied sixty-three children (male=41; median age=8 years; range=4-18 years). The two radiologists' migration percentage measurements were highly correlated with each other across all simulated and real radiographs (Spearman's rho=0.86-0.99, P<0.01). For both readers and hips, migration percentages measured from real radiographs were significantly different from those measured from neutral simulated radiographs (P<0.01), with median absolute difference=5-6 percentage points (PP) and interquartile range (IQR)=9-12 PP. When comparing migration percentage measurements from neutral simulated radiographs to those in kyphosis/lordosis and right/left rotations, median absolute differences were 2-4 PP (IQR=3-8 PP) and 4-15 PP (IQR=6-17 PP), respectively. CONCLUSION: Inter-rater reliability of measured migration percentages is high, but accuracy decreases with patient positional changes.

Virtual 3D femur model to assess femoral version: comparison to the 2D axial slice approach.

BACKGROUND: Quantifying femoral version is crucial in diagnosing femoral version abnormalities and for accurate pre-surgical planning. There are numerous methods for measuring femoral version, however, reliability studies for most of these methods excluded children with hip deformities. OBJECTIVE: To propose a method of measuring femoral version based on a virtual 3D femur model, and systematically compare its reliability to the widely used Murphy's 2D axial slice technique. MATERIALS AND METHODS: We searched our imaging database to identify hip/femur CTs performed on children (<18 years old) with a clinical indication of femoral version measurement (September 2021-August 2022). Exclusion criteria were prior hip surgery, and inadequate image quality or field-of-view. Two blinded radiologists independently measured femoral version using the virtual 3D femur model and Murphy's 2D axial slice method. To assess intrareader variability, we randomly selected 20% of the study sample for re-measurements by the two radiologists >2 weeks later. We analyzed the reliability and correlation of these techniques via intraclass correlation coefficient (ICC), Bland-Altman analysis, and deformity subgroup analysis. RESULTS: Our study sample consisted of 142 femurs from 71 patients (10.6±4.4 years, male=31). Intra- and inter-reader correlations for both techniques were excellent (ICC≥0.91). However, Bland-Altman analysis revealed that the standard deviation (SD) of the absolute difference between the two radiologists for the Murphy method (mean 13.7°) was larger than that of the 3D femur model technique (mean 4.8°), indicating higher reader variability. In femurs with hip flexion deformity, the SD of the absolute difference for the Murphy technique was 17°, compared to 6.5° for the 3D femur model technique. In femurs with apparent coxa valga deformity, the SD of the absolute difference for the Murphy technique was 10.4°, compared to 5.2° for the 3D femur model technique. CONCLUSION: The 3D femur model technique is more reliable than the Murphy's 2D axial slice technique in measuring femoral version, especially in children with hip flexion and apparent coxa valga deformities.

Physeal injuries of the clavicle: pediatric counterparts to adult acromioclavicular and sternoclavicular joint separations.

The epiphyses at the medial and lateral ends of the clavicle are small, ossify relatively late, and may not fuse until early adulthood. Because of this unique anatomy, pediatric and young adult injuries that involve the clavicle often differ from the patterns typically seen in older adults. Clavicular trauma that affects the acromioclavicular joint laterally or sternoclavicular joint medially often results in a physeal fracture and as such, can go unrecognized or be mistaken for a joint dislocation. Radiographic assessment is challenging, particularly when the epiphysis is not yet ossified. However, MR imaging allows for visualization of the cartilage, periosteum and perichondrium, and ligaments of the affected joints. Lateral clavicle physeal injuries can be categorized by the Dameron and Rockwood system, the pediatric correlate to the Rockwood classification of adult acromioclavicular joint injuries. Medial clavicle physeal fractures, similar to adult sternoclavicular joint dislocations, may result in anterior or posterior displacement. Because of their great ability to heal and remodel, clavicular physeal fractures respond better to conservative management than true acromioclavicular or sternoclavicular joint dislocations. Therefore, it is essential to recognize the true nature of these injuries, as there are implications for successful treatment and appropriate prognosis.

Advanced imaging of disease unrelated to the coronavirus disease 2019 (COVID-19) during the pandemic: effect of patient demographics in a pediatric emergency department.

BACKGROUND: Coronavirus disease 2019 (COVID-19) disproportionately affected children from underrepresented minorities and marginalized populations, but little is understood regarding the pandemic's effect on non-COVID-19-related illnesses. OBJECTIVE: To examine the effect of the COVID-19 pandemic and related stay-at-home orders on pediatric emergency department (ED) imaging of non-COVID-19-related diseases across patient demographic groups. MATERIALS AND METHODS: We retrospectively reviewed radiology reports from advanced imaging (US, CT, MRI and fluoroscopy) on children in the ED during the month of April for the years 2017, 2018, 2019 and 2020, excluding imaging for respiratory illness and trauma. We used imaging results and the electronic medical record to identify children with positive diagnoses on advanced imaging, and whether these children were admitted to the hospital. Demographic variables included age, gender, race/ethnicity and insurance type. We used multivariable Poisson regression models to report rate ratio (RR) and binomial logistic regression models to report odds ratio (OR) with 95% confidence interval (CI). RESULTS: We included 1,418 ED encounters for analysis. Compared to pre-2020, fewer children underwent ED imaging in April 2020 (RR 0.63, 95% CI 0.52, 0.76). The odds of positive imaging results increased (OR 2.18, 95% CI 1.59, 3.00) overall, and for all racial/ethnic groups except Hispanic patients (OR 0.83, 95% CI 0.34, 2.03). No differences occurred in admission rates for positive imaging results in 2020 compared to pre-2020. CONCLUSION: In April 2020 compared to pre-2020, there were decreased imaging and increased positivity rates for imaging for non-respiratory and non-trauma ED visits. COVID-19 stay-at-home advisories might have resulted in triaging for urgent health care by families or referring clinicians during this month of the pandemic.

Emergency pediatric radiology imaging trends for non-COVID-19-related illnesses through different stages of the pandemic.

PURPOSE: To evaluate how the COVID-19 pandemic affected the imaging utilization patterns for non-COVID-19-related illness in a pediatric emergency department (ED). METHODS: We retrospectively reviewed radiology reports for ultrasound, CT, MRI, and fluoroscopy studies performed at a pediatric ED in April from 2017 to 2021, excluding studies for respiratory symptoms and trauma. Radiology reports and medical records were reviewed to determine if patients had a positive radiology diagnosis, the type of diagnosis, and whether it required hospital admission. Results from during the pandemic were compared to predicted rates based on pre-pandemic years. RESULTS: A total of 2198 imaging studies were included. During the COVID-19 pandemic, fewer ED imaging studies were performed compared to predicted. The decrease was greater in April 2020 (RR = 0.56, p < 0.001) than in April 2021 (RR = 0.80, p = 0.038). The odds of positive diagnosis was higher during the pandemic than before, and higher in 2020 (OR 2.53, p < 0.001) than in 2021 (OR 1.38, p = 0.008). The expected numbers of positive diagnoses and hospital admittances remained within the predicted range during the pandemic (p = 0.505-0.873). CONCLUSIONS: Although imaging volumes decreased during the studied months of the pandemic, the number of positive findings was unchanged compared to prior years. No differences were demonstrated in the percentage of patients admitted to the hospital with positive imaging findings. This suggests that, at our institution, the pandemic did not lead to a substantial number of missed diagnoses or severely delay the diagnosis of non-COVID-related conditions. While still lower than expected, imaging volumes increased in April 2021 suggesting a return towards baseline patient behavior as the pandemic conditions improved.

Ultrasound Assessment of Quadriceps Femoris Muscle Thickness in Critically Ill Children.

OBJECTIVES: Evaluate the reliability of ultrasound to measure quadriceps femoris muscle thickness in critically ill children and to describe serial changes in quadriceps femoris muscle thickness in relation to fluid balance and nutritional intake. DESIGN: Prospective observational study. SETTING: Tertiary care children's hospital. PATIENTS: Inpatients age 3 months to 18 years recently admitted to the ICU who were sedated and mechanically ventilated at the time of the first ultrasound scan. METHODS: Prospective observational study to examine the reliability of averaged ultrasound measurements of quadriceps femoris muscle thickness. Change in average quadriceps femoris muscle thickness over time was correlated with fluid balance and nutritional intake. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: Averaged quadriceps femoris muscle thickness demonstrated good to excellent reliability when comparing pediatric critical care providers to pediatric radiologists and when comparing between different pediatric critical care providers. We found no significant association between fluid balance over 1 or 3 days and change in quadriceps femoris muscle thickness over the same time frame. However, there was a significant association between percent of goal calories (p < 0.001) or percent of goal protein (p < 0.001) over 6 days and change in quadriceps femoris muscle thickness over the same time frame. CONCLUSIONS: Averaged ultrasound measurements of quadriceps femoris muscle thickness demonstrate good to excellent reliability, are not confounded by fluid balance, and are useful for tracking changes in muscle thickness that are associated with nutritional intake. Ultrasound-based assessment of quadriceps femoris is a clinically useful tool for evaluating muscle mass and may be a proxy for nutritional status.

Magnetic resonance imaging of medial collateral ligament avulsion fractures of the knee in children: a potentially underestimated injury.

BACKGROUND: Literature regarding medial collateral ligament (MCL) injuries is focused on adults with superficial MCL disruptions. However, children follow different injury patterns, with avulsion fractures at ligament attachment sites occurring commonly. Such avulsions have not been characterized for pediatric MCL injuries. OBJECTIVE: To elucidate imaging findings, and review management and outcomes of pediatric MCL avulsion fractures. MATERIALS AND METHODS: We conducted a 10-year retrospective review of knee magnetic resonance (MR) imaging reports for patients younger than 16 years old diagnosed with acute MCL avulsion fracture. MR imaging was reviewed to confirm and characterize the components of the avulsion (perichondrium without or with cartilage, and/or bone) and to identify additional knee injuries. Radiographs, if available, from the time of injury were reviewed. Clinical management and patient outcomes were recorded. RESULTS: Eighteen patients (13 boys, 5 girls) incurred an acute MCL avulsion fracture. All avulsions involved the deep MCL attachment: 17 meniscofemoral and 1 meniscotibial component. Two avulsions also included the superficial MCL attachment. Nine boys had non-osseous avulsions, all radiographically occult. All girls had radiographically apparent avulsions. Three girls and three boys sustained associated knee derangements, most commonly anterior cruciate ligament (ACL) injury (n=4). All MCL avulsions were initially treated conservatively; one child required subsequent surgery for ongoing pain. CONCLUSION: Pediatric MCL avulsion fractures in this study uniformly involve the attachment of the deep MCL and can be entirely non-osseous, particularly in boys who lag in skeletal maturity, making these injuries radiographically occult. MR imaging may be required to recognize these avulsions, which can impact the duration of rest and knee bracing.

The continuous lure of pediatric radiology.

Pediatric radiology is an immensely rewarding career choice. Eight pediatric radiologists, enthusiastic for their profession, were asked six questions about their career choice. Their responses illustrate the common virtues of pediatric radiology and also demonstrate the diverse paths and activities that pediatric radiologists take and pursue.

Contrast enhanced ultrasound for the evaluation of blunt pediatric abdominal trauma.

INTRODUCTION: Blunt abdominal trauma is a common problem in children. Computed tomography (CT) is the gold standard for imaging in pediatric blunt abdominal trauma, however up to 50% of CTs are normal and CT carries a risk of radiation-induced cancer. Contrast enhanced ultrasound (CEUS) may allow accurate detection of abdominal organ injuries while eliminating exposure to ionizing radiation. METHODS: Children aged 7-18years with a CT-diagnosed abdominal solid organ injury underwent grayscale/power Doppler ultrasound (conventional US) and CEUS within 48h of injury. Two blinded radiologists underwent a brief training in CEUS and then interpreted the CEUS images without patient interaction. Conventional US and CEUS images were compared to CT for the presence of injury and, if present, the injury grade. Patients were monitored for contrast-related adverse reactions. RESULTS: Twenty one injured organs were identified by CT in eighteen children. Conventional US identified the injuries with a sensitivity of 45.2%, which increased to 85.7% using CEUS. The specificity of conventional US was 96.4% and increased to 98.6% using CEUS. The positive predictive value increased from 79.2% to 94.7% and the negative predictive value from 85.3% to 95.8%. Two patients had injuries that were missed by both radiologists on CEUS. In a 100kg, 17year old female, a grade III liver injury was not seen by either radiologist on CEUS. Her accompanying grade I kidney injury was not seen by one of the radiologist on CEUS. The second patient, a 16year old female, had a grade III splenic injury that was missed by both radiologists on CEUS. She also had an adjacent grade II kidney injury that was seen by both. Injuries, when noted, were graded within 1 grade of CT 33/35 times with CEUS. There were no adverse reactions to the contrast. CONCLUSION: CEUS is a promising imaging modality that can detect most abdominal solid organ injuries in children while eliminating exposure to ionizing radiation. A multicenter trial is warranted before widespread use can be recommended. LEVEL OF EVIDENCE: Level II; Diagnostic Prospective Study.

Prevalence of Capitellar Osteochondritis Dissecans in Children With Chronic Radial Head Subluxation and Dislocation.

OBJECTIVE: An abnormal radiocapitellar articulation may play a role in the development of capitellar osteochondritis dissecans (OCD). The objective of this study is to determine the prevalence of capitellar OCD in pediatric patients with chronic radial head subluxation (RHS) or radial head dislocation (RHD). MATERIALS AND METHODS: We searched the radiology reports generated at a large pediatric hospital between 2004 and 2012, to identify patients 8-18 years old with chronic RHS or RHD. Patients with underlying bony abnormalities that could obscure, be confused with, or increase the risk of OCD of the elbow were excluded. Two pediatric radiologists assessed images of the elbow, grading radiocapitellar alignment as follows: normal, subluxed, dislocated, or intermittently subluxed and dislocated. Readers also reviewed images to detect capitellar OCD. The differences in the prevalence of OCD noted in elbows in each category of radiocapitellar alignment were assessed. RESULTS: A total of 118 cases of chronic RHS, RHD, or both were detected in 100 patients. The radiocapitellar alignment of these cases was defined as follows: 53-58% were dislocated, 26-31% were subluxed, 14-15% were intermittently subluxed and dislocated, and less than 1% had normal alignment. There were 14 cases of capitellar OCD (11.9%). One elbow with OCD was categorized by both readers as dislocated, with the remaining 13 elbows (93%) deemed by the two readers to be either subluxed or intermittently subluxed and dislocated. The percentage of elbows with RHS that were found to have capitellar OCD was 32.3-33.3%, compared with 1.4-1.6% of elbows with RHD. CONCLUSION: The prevalence of capitellar OCD is greater in elbows with RHS than in those with RHD. This finding suggests that abnormal radiocapitellar mechanics are a factor in the development of OCD. In children with RHS and new or worsening pain, capitellar OCD should be considered, and imaging strategies should be directed toward early identification of this important and treatable condition.

Posteromedial subtalar coalitions: prevalence and associated morphological alterations of the sustentaculum tali.

BACKGROUND: A variant form of subtalar coalition isolated to the posterior sustentaculum has been previously described, though its prevalence is not known and its relationship to the middle facet has not been characterized. OBJECTIVE: To determine the prevalence and morphological alterations of isolated posteromedial subtalar coalitions. MATERIALS AND METHODS: Computed tomography (CT) images of the foot or ankle performed from 2004 to 2012 were reviewed and 97 patients (mean age: 13.3+/-2.9 years; range: 9-19 years) with subtalar coalition were identified. In 41 (42%) of these, the condition was bilateral, yielding a total of 138 subtalar coalitions. In the 33 patients where CT demonstrated isolated posteromedial subtalar coalitions, multiplanar reformats along the long axis of the sustentaculum tali were generated, from which the anteroposterior dimensions of the sustentaculum tali and middle facet were measured. Posterior sustentaculum measurements defining the posterior extension of the sustentaculum beyond the middle facet were directly measured by two radiologists. Ratios of middle facet to posterior sustentaculum measurements were calculated. Thirty-three patients undergoing CT for ankle fracture served as controls. RESULTS: Ninety-seven of 138 coalitions (70.2%) affected the middle facet and 2/138 (1.4%) involved the posterior facet. There were 39 (28.2%) posteromedial subtalar coalitions in 33 patients. Mean AP measurements of the middle facet and posterior sustentaculum in patients with posteromedial subtalar coalitions were 12.6 mm and 18.2 mm, respectively, compared to 16.6 mm and 9.2 mm in controls (P<0.001). Mean middle facet/posterior sustenaculum (MF/PS) ratios were 0.74 for posteromedial subtalar coalitions vs. 1.92 for controls (P<0.001). CONCLUSION: Posteromedial subtalar coalitions comprise more than one-quarter of subtalar coalitions, and are associated with an intact, but shorter, middle facet and longer sustentaculum tali. This observation may aid in accurate diagnosis and management of this relatively common disorder.

Bone marrow segmentation based on a combined consideration of transverse relaxation processes and Dixon oscillations.

The aim of this study was to demonstrate that gradient-echo sampling of single spin echoes can be used to isolate the signal from trabecular bone marrow, with high-quality segmentation and surface reconstructions resulting from the application of simple post-processing strategies. Theoretical expressions of the time-domain single-spin-echo signal were used to simulate signals from bone marrow, non-bone fatty deposits and muscle. These simulations were compared with and used to interpret signals obtained by the application of the gradient-echo sampling of a spin-echo sequence to image the knee and surrounding tissues at 1.5 T. Trabecular bone marrow has a much higher reversible transverse relaxation rate than surrounding non-bone fatty deposits and other musculoskeletal tissues. This observation, combined with a choice of gradient-echo spacing that accentuates Dixon-type oscillations from chemical-shift interference effects, enabled the isolation of bone marrow signal from surrounding tissues through the use of simple image subtraction and thresholding. Three-dimensional renderings of the marrow surface were then readily generated with this approach - renderings that may prove useful for bone morphology assessment, e.g. for the measurement of femoral anteversion. In conclusion, understanding the behavior of signals from bone marrow and surrounding tissue as a function of time through a spin echo facilitates the segmentation and reconstruction of bone marrow surfaces using straightforward post-processing strategies that are typically available on modern radiology workstations.

Variation of Syndesmosis Anatomy With Growth.

BACKGROUND: Syndesmosis injury is common in trauma and in the sport medicine population. Diagnosis and treatment of this pathology is controversial in adult population and almost unknown in a growing and immature ankle. The objective of this study was to describe the relationship between the distal tibia and fibula in immature, growing, and mature children. METHODS: A retrospective imaging study was performed on ankle magnetic resonance images (MRI), which were divided into 3 groups according to age: immature, growing, or mature. The syndesmosis anatomy was described in 3 planes following an established measurement system. The measurement system was also validated (intraobserver and interobserver reproducibility) on a subgroup of 30 MRIs with 4 surgeons. RESULTS: The measurement system, previously described on CT scans, is valid when used on MRIs. The mediolateral translation significantly increases with growth and external rotation of fibula decreases. The anteroposterior position is also significantly different between groups but the ratios are similar. CONCLUSIONS: This study reported differences in distal tibiofibular relationship in a growing population. This information will be crucial in future development of diagnostic and follow-up criteria of syndesmosis injury. It also presented a valid and precise measurement system to describe syndesmotic anatomy in 3 planes. LEVEL OF EVIDENCE: Level IV.

Diagnosis and management of symptomatic muscle herniation of the extremities: a retrospective review.

BACKGROUND: There is a paucity of published literature on diagnosis and surgical management of muscle herniation of the extremities, with most reported cases involving military personnel and men aged 18 to 40 years. Hypothesis/ PURPOSE: The purpose of this study is to describe the presentation, diagnosis, and results of fasciotomy for symptomatic muscle herniation in young athletes. We hypothesize that fasciotomy can be a safe and effective treatment option that allows the majority of athletes to return to sports. STUDY DESIGN: Case series; Level of evidence, 4. METHODS: From 2001 to 2011, 26 athletes (19 women; 11 runners) with a mean age 19.0 ± 4.0 years (range, 14.2-28.4 years) underwent fasciotomy for symptomatic muscle herniation at the authors' institution. Retrospective chart review recorded pertinent patient data and clinical course. Questionnaires were sent to all patients to assess satisfaction with surgery, ability to return to sports, and residual symptoms. RESULTS: Muscle hernias were classified as primary (n = 8, 31%), postsurgical (n = 8, 31%), and associated with underlying untreated chronic exertional compartment syndrome (n = 10, 38%). The tibialis anterior muscle (n = 12, 46%) was most commonly involved. The mean time from onset of symptoms to surgery was 15.1 ± 8.6 months (range, 3-38 months). Dynamic ultrasound (5/6 patients, 83%) was more accurate than magnetic resonance imaging (3/18, 17%) at identifying the hernia. At median follow-up of 28 months (range, 12-127 months), 17 patients (65%) had returned to sports. Seventeen patients (65%) completed the postoperative questionnaire; 14 reported being satisfied with their results (82%). Mild residual symptoms were common (9 of 17 respondents, 53%), especially in runners (5 of 7, 71%), all of whom were satisfied with surgery. Patients with a postsurgical muscle herniation took the longest to return to sports and were the least likely to return to sports, had the highest rate of dissatisfaction with surgery, and were most likely to have persistent symptoms not improved by surgery. CONCLUSION: Fasciotomy is a safe surgical option for symptomatic muscle herniation in young athletes. Many patients are able to return to sports and most are satisfied with surgery. Residual symptoms are common, especially in runners. Patients with postsurgical muscle herniations may have the worst clinical outcome.

Imaging of vascular anomalies.

Accurate characterization of vascular anomalies is important in predicting clinical course and guiding treatment. This article provides an imaging review of vascular anomalies, highlighting the particular imaging characteristics of hemangiomas and malformations. Discussed are the appropriate imaging modalities for the evaluation of the anomalies and the associated abnormalities that require further investigation.

US diagnosis of pediatric muscle hernias of the lower extremities.

Muscle hernias result from the protrusion of muscle through acquired or congenital fascial defects. They most often occur in the lower extremities of young adults, typically men. There has been limited description in the literature of this entity in children. Our purpose is to evaluate the demographics, presentation and imaging findings of muscle hernias diagnosed by US in our pediatric patient population. We conducted a retrospective review of all lower extremity muscle hernias diagnosed by US in patients younger than 19 years of age, from January 2001 to March 2011, evaluating the reason for referral, imaging performed before and after US, and subsequent clinical course. Sixteen children were diagnosed with muscle hernia by US, 11 girls and 5 boys, ages 3 to 18 years (mean 13.8). Sixty-nine percent (n = 11) involved the tibialis anterior. Clinical suspicion for muscle hernia was present in seven patients (44%). Of the four cases where MR was performed before US, three were interpreted as normal. In 13 cases (81%), the radiologist reported that dynamic imaging with provocative maneuvers (plantar flexion, standing, squatting) was either necessary or helpful in visualizing the muscle hernia. Four children had surgery to treat symptoms. Muscle hernias are often not suspected clinically in children. US with dynamic imaging and provocative maneuvers is key to diagnosis. US confirmation of a muscle hernia provides a reassuring diagnosis and helps exclude the presence of an aggressive lesion. Surgical intervention is an option for persistent symptoms, but is often not necessary.

Imaging SCFE: diagnosis, treatment and complications.

Slipped capital femoral epiphysis (SCFE) is a common orthopedic disorder in children. It can lead to avascular necrosis, cartilage loss, femoroacetabular impingent (FAI) and early osteoarthritis. The consequences of SCFE are worsened by delays in diagnosis and proper management. Radiography is the primary imaging modality used to evaluate SCFE; however, MR, CT and bone scintigraphy have important roles. Preoperatively, these modalities assist in surgical planning and predicting prognosis; postoperatively, they provide assessment of hardware failure, ischemic necrosis and morphology predisposing to FAI. Emphasizing a multimodality approach, this review addresses the imaging diagnosis of SCFE, the expected postoperative appearances and the findings of immediate and long-term complications.