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RISS 인기검색어
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- 저자 : MacEwen, Gwendolyn (검색결과 5 건)
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Oh, Chang-Wug,Joo, Sun Young,Kumar, S. Jay,MacEwen, G. Dean Lippincott Williams Wilkins, Inc. 2009 Journal of pediatric orthopedics Vol.29 No.4
BACKGROUND:: After treatment of developmental dysplasia of the hip, lateral growth arrest of the physis of the proximal femur resulting in disturbance of the growth of the capital femoral epiphysis is not uncommon. The changes are usually not apparent until approximately the age of 9 years. The residual deformity has a variable prognosis at skeletal maturity. The purpose of this study was to assess the long-term impact of these proximal femoral changes on the function of the hips. METHODS:: We reviewed the natural history of 22 hips in 21 patients who had a lateral growth arrest of the physis of the proximal femur after treatment of developmental dysplasia of the hip. The average age at follow-up was 22 years. The radiographic changes in the proximal femur after the growth arrest were analyzed. Radiographic outcome was assessed using Severin criteria, with classes I and II being graded as satisfactory and classes III and IV being graded as unsatisfactory. The Iowa hip score was used to assess clinical outcome. RESULTS:: The consistent radiographic findings were a shortened lateral neck length in comparison with the medial neck length and lateral tilting of the capital femoral epiphysis, both of which were evident by an average age of 9 years. Overall, 41% of hips had a satisfactory radiological outcome according to the Severin classification. Two types of changes were observed in the proximal femur: a varus configuration (pattern A, 12 hips) and a valgus configuration (pattern B, 10 hips). Pattern A hips (varus) had a satisfactory result in 75% of the hips compared with none in pattern B hips (valgus). CONCLUSIONS:: Valgus orientation of the proximal femur (pattern B) leads to disruption of the Shenton line, progressive subluxation, and acetabular dysplasia which resulted in class III or class IV Severin grade hips leading to a poorer clinical and radiological outcome at long-term follow-up. LEVEL OF EVIDENCE:: Level III-Diagnostic study
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Joo, Sun Young,Oh, Chang-Wug,Grissom, Leslie,Kumar, S. Jay,MacEwen, G. Dean Lippincott Williams Wilkins, Inc. 2009 Journal of pediatric orthopedics Vol.29 No.6
BACKGROUND: Lateral growth disturbance of the proximal femoral physis after treatment of developmental dysplasia of the hip, also known as type 2 avascular necrosis, has been described in a 2-dimensional (2D) plane with standard radiographs. It is not well described in the 3-dimensional plane using 3D computed tomography (CT) scan. The purpose of this study was to define the anatomy of the proximal femur after the lateral growth disturbance of the proximal femoral physis with 3D CT scans. METHODS: Ten patients (11 hips) with lateral growth disturbance of the proximal femoral physis after treatment for developmental dysplasia of the hip (9 hips) and extracorporeal membrane oxygenation (2 hips), were studied with 2D and 3D CT methods. CT was done at an average age of 12.5 years (range, 9.8 to 16.69). RESULTS: In addition to the typical valgus configuration in the coronal plane, increased antetorsion of the femur (10 of 11 hips) and increased anteversion of the femoral head (8 of 11 hips) were a common finding seen in the transverse plane. In 6 of 7 hips for which the CT scan was performed before the closure of the capital femoral epiphysis, the physeal bridge was seen to be located in the anterolateral (5 hips) or posterolateral (1 hip) area of the proximal femoral physis. The version of the femoral head was correlated to the location of the physeal bridge. Acetabular dysplasia was seen in 4 hips. In the 3D reconstruction view, flexion deformity of the femoral head was seen in 6 hips and lack of coverage at the anterolateral portion of the femoral head was observed in 6 hips. CONCLUSIONS: The treating surgeon should be aware of the often marked antetorsion and also anteversion of the femoral head and neck associated with lateral growth disturbance of the proximal femoral physis. This knowledge allows surgical planning to correct rotational and sagittal plane correction of the proximal femur, which will allow normalizing hip mechanics. Acetabular side correction also may be needed if acetabular dysplasia is present. LEVEL OF EVIDENCE: Level III, diagnostic study.
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