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      Levels of Evidence in the Treatment of Slipped Capital Femoral Epiphysis: A Systematic Review

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          Abstract

          The primary aim of this study was to analyze the current level of evidence available on the surgical management of Slipped Capital Femoral Epiphysis (SCFE). Secondary aims were to correlate the level of evidence with the impact factor of the journal to evaluate the level of evidence over time, and to evaluate the geographic distribution of the studies. Therapeutic studies published in English between January 1991 and August 2014 that reported on SCFE were identified via electronic search was performed using the databases PubMed, EMBASE, and the Cochrane Library. The search terms used included: Slipped capital femoral epiphyses OR SCFE OR Slipped upper femoral epiphyses OR SUFE AND Management OR Treatment. Correlation between the level of evidence and the impact factor of the journal were analyzed together with linear regression models to reveal any significant trends over time. A total of 1516 studies were found, of which 321 were included in the final analysis. The most frequent study type was the case series (51.1%) followed by case reports (22.4%) and expert opinion (14.0%). Randomized control trial accounted for only 0.6%. The Journal of Pediatric Orthopedics (American) had the most studies (22.6%) and the highest number of level 2 (n=1) and level 3 (n=15) type evidence. There was no progression of level of evidence over time. There was no correlation between level of evidence and impact factor of journal. The majority of therapeutic studies on SCFE are of low level of evidence. High-level RCTs are difficult to perform in pediatric orthopedic surgery, however the management of SCFE would benefit from well-designed, multicenter, clinical RCTs to advance evidence-based practice.

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          Most cited references14

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          Hip morphology influences the pattern of damage to the acetabular cartilage: femoroacetabular impingement as a cause of early osteoarthritis of the hip.

          Recently, femoroacetabular impingement has been recognised as a cause of early osteoarthritis. There are two mechanisms of impingement: 1) cam impingement caused by a non-spherical head and 2) pincer impingement caused by excessive acetabular cover. We hypothesised that both mechanisms result in different patterns of articular damage. Of 302 analysed hips only 26 had an isolated cam and 16 an isolated pincer impingement. Cam impingement caused damage to the anterosuperior acetabular cartilage with separation between the labrum and cartilage. During flexion, the cartilage was sheared off the bone by the non-spherical femoral head while the labrum remained untouched. In pincer impingement, the cartilage damage was located circumferentially and included only a narrow strip. During movement the labrum is crushed between the acetabular rim and the femoral neck causing degeneration and ossification. Both cam and pincer impingement lead to osteoarthritis of the hip. Labral damage indicates ongoing impingement and rarely occurs alone.
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            Level of evidence in orthopaedic journals.

            The American edition of The Journal of Bone and Joint Surgery (JBJS-A) has included a level-of-evidence rating for each of its clinical scientific papers published since January 2003. The purpose of this study was to assess the type and level of evidence found in nine different orthopaedic journals by applying this level-of-evidence rating system. We reviewed all clinical articles published from January through June 2003 in nine orthopaedic journals. Studies of animals, studies of cadavera, basic-science articles, review articles, case reports, and expert opinions were excluded. The remaining 382 clinical articles were randomly assigned to three experienced reviewers and two inexperienced reviewers, who rated them with the JBJS-A grading system. Each reviewer determined whether the studies were therapeutic, prognostic, diagnostic, or economic, and each rated the level of evidence as I, II, III, or IV. Reviewers were blinded to the grades assigned by the other reviewers. According to the reviewers' ratings, 70.7% of the articles were therapeutic, 19.9% were prognostic, 8.9% were diagnostic, and 0.5% were economic. The reviewers graded 11.3% as Level I, 20.7% as Level II, 9.9% as Level III, and 58.1% as Level IV. The kappa values for the interobserver agreement between the experienced reviewers and the inexperienced reviewers were 0.62 for the level of evidence and 0.76 for the study type. The kappa values for the interobserver agreement between the experienced reviewers were 0.75 for the level of evidence and 0.85 for the study type. The kappa values for the agreement between the reviewers' grades and the JBJS-A grades were 0.84 for the level of evidence and 1.00 for the study type. All kappa values were significantly different from zero (p < 0.0001 for all). The percentage of articles that were rated Level I or II increased in accordance with the 2003 journal impact factors for the individual journals (p = 0.0061). Orthopaedic journals with a higher impact factor are more likely to publish Level-I or II articles. The type and level of information in orthopaedic journals can be reliably classified, and clinical investigators should pursue studies with a higher level of evidence whenever feasible.
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              Delay in diagnosis of slipped capital femoral epiphysis.

              Delay in diagnosis of slipped capital femoral epiphysis (SCFE) has important implications in terms of slip severity and long-term hip outcome. The purpose of this study was to identify predictors of delay in the diagnosis of SCFE. A review of 196 patients with SCFE was performed. The primary outcome measure was delay from onset of symptoms to diagnosis. Covariates included age, gender, side, weight, pain location, insurance status, family income, slip severity, and slip stability. Delay in diagnosis was not normal in distribution; therefore, nonparametric univariate and multivariate analyses were performed. The median delay in diagnosis was 8.0 weeks. There was a significant relationship between delay in diagnosis and slip severity ( 50 degrees : 20.6 weeks). There were no significant associations between delay in diagnosis and covariates of age, gender, side, and weight. There were significant associations between longer delay in diagnosis and covariates of knee/distal-thigh pain versus hip/proximal-thigh pain (6.0 vs 15.0 weeks), Medicaid coverage versus private insurance (12.0 vs 7.5 weeks), lower family income, and stable slips versus unstable slips (8.0 vs 6.5 weeks). Controlling for the other covariates, knee/distal-thigh pain, Medicaid insurance, and stable slips remained significant independent multivariate predictors of delay in diagnosis. Patients who present with primarily knee or distal-thigh pain, patients with Medicaid coverage, and patients with stable slips have longer delays in diagnosis of SCFE. Focused intervention programs to reduce the delay in diagnosis of SCFE should emphasize patients with knee/thigh pain and patients with Medicaid coverage.
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                Author and article information

                Journal
                Orthop Rev (Pavia)
                Orthop Rev (Pavia)
                OR
                Orthopedic Reviews
                PAGEPress Publications, Pavia, Italy
                2035-8237
                2035-8164
                27 June 2016
                27 June 2016
                : 8
                : 2
                : 6303
                Affiliations
                [1 ]St James’s Hospital , Dublin, Ireland
                [2 ]Our Lady’s Hospital Crumlin , Dublin, Ireland
                Author notes
                St. James’s Hospital, James’s Street, Dublin 8, Ireland. +353.8514.66551. andrewmoriarity@ 123456gmail.com

                Contributions: the authors contributed equally.

                Conflict of interest: the authors declare no potential conflict of interest.

                Article
                10.4081/or.2016.6303
                4933817
                27433299
                85e0b320-9430-40bd-ae6f-e746e1ed6c0a
                ©Copyright A. Moriarity et al.

                This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 11 November 2015
                : 13 February 2016
                : 14 April 2016
                Page count
                Figures: 1, Tables: 5, Equations: 0, References: 20, Pages: 5
                Categories
                Case Report

                Orthopedics
                levels of evidence,systematic review,slipped capital femoral epiphysis,management
                Orthopedics
                levels of evidence, systematic review, slipped capital femoral epiphysis, management

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