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| MR evaluation of the failure factors of closed reduction in developmental dysplasia of the hip |
| GAO Shan1, TIAN De-run1, WANG Zhi2 |
1.Department of Anatomy, Histology and Embryology, Tianjin Medical University, Tianjin 300070, China;
2.The Second Department of Radiology, Tianjin Hospital, Tianjin 300211, China |
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Abstract Objective: To evaluate the results of closed reduction in developmental dysplasia of the hip(DDH) by MRI, and to explore the factors which lead to the failure of closed reduction. Methods: Consecutive 85 children with DDH treated by closed reduction and plaster external fixation were enrolled. After reduction, all children underwent conventional MRI scan. The cartilage acetabular index(CAHI) was measured in the coronal image, then all children were divided into a successful group and a failure group after closed reduction. Two groups of patients were measured the bony acetabular index(BAI), cartilaginous acetabular index(CAI), center edge angle(CE angle), cartilaginous center edge angle(CCE angle), and the acetabular cartilage, labrum and round ligament were observed. The differences of the value of BAI, CAI, CE angle, CCE angle and the probability of high signal area in acetabular cartilage, labrum hypertrophy and varus, round ligament hypertrophy were compared between two groups. Results: There was no significant difference between the two groups in BAI or CAI(P>0.05). In the failure group, CE and CCE angles were significantly lesser than those of successful group(P<0.05). The probability of high signal area in acetabular cartilage, labrum hypertrophy and varus, round ligament hypertrophy was significantly higher than that of the successful group. Conclusions: CE(CCE) angle can be used as the important indicator to evaluate closed reduction. High signal area in acetabular cartilage, labrum hypertrophy and varus, round ligament elongation and hypertrophy will lead to unsatisfactory treatment effect.
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Received: 25 April 2017
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2018, Vol. 29 
