BACKGROUND:: Ligamentum teres is hypertrophied and should be resected in @entity572 ( @entity572 ). We have observed a relatively high prevalence of @entity2048 ( @entity2048 ) in severe @entity572 . The purpose of this study was to determine: (1) the percentage of @entity2048 in @entity572 ; (2) the risk factors correlating with @entity2048 ; and (3) the pathologic characteristics of @entity572 with @entity2048 . METHODS:: In 2012, 123 @entity1 were hospitalized for open reduction of @entity572 . Clinical records were retrospectively reviewed. The distribution of @entity2048 was discerned. The risk factors correlating with @entity2048 were analyzed. The pathologic changes of the @entity572 with @entity2048 were observed. RESULTS:: For the 123 @entity1 , there were 14 males and 109 females with a mean age of 2.2  1.7 years old. Forty-one cases were diagnosed with bilateral @entity572 , and 27 of them had open reduction for both hips. Thus, 150 hips were included. According to the Tonnis grading, there were 1 grade I, 43 II, 67 III, and 39 IV @entity1 . During operation, the ligamentum teres was confirmed absent in 24 @entity1 (28 hips, 18.67%), 22 of the hips with @entity2048 was Tonnis grade IV (78.57%). It was present in the other 99 @entity1 (122 hips). The difference of @entity2048 among different grade (  =43.959, P=0.000) and different age (  =10.748, P=0.008) showed statistical significance, respectively. Logistic regression revealed only grading was the correlation factor of @entity2048 (P=0.000). Pathologically, the femoral head was extremely small. The cartilage surface showed erosion-like change. The acetabulum was also diminutive but could match the femoral head well. CONCLUSIONS:: At our institution, 18.67% of @entity572 needing open reduction was combined with @entity2048 . The degree of dislocation was the only correlation factor of @entity2048 . If the Tonnis grade was high, the hip was often associated with @entity2048 . CLINICAL RELEVANCE:: This study defines the prevalence of @entity2048 and its risk factor in @entity572 , which will help to better understand the imaging, pathologic findings, and clinical outcome of @entity572 .

Absence of Ligamentum Teres in XXXX .

@entity1 :: ('9606', 'Species') :: ['patients'] @entity572 :: ('MESH:D006617', 'Disease') :: ['DDH', 'developmental dysplasia of the hip'] @entity2048 :: ('MESH:D004832', 'Disease') :: ['absence of ligamentum teres', 'ALT']
@entity572 :: (MESH:D006617,Disease) :: ['Developmental Dysplasia of the Hip']
