We analyzed plain radiographs of 591 normal adult hips of various parameters to evaluate the radiological characteristics of the hip joint including the center-edge (CE) angle, acetabular angle, acetabular depth, acetabular roof obliquity and roof angle, and also to verify the rate of acetabular dysplasia. The CE angle was negatively correlated with acetabular angle and acetabular obliquity, but it was positively correlated with acetabular depth and roof angle. The rate of acetabular dysplasia (CE angle<20 degrees) was 1.8%. We concluded that the CE angle and acetabular angle are more useful parameters for the diagnosis of acetabular dysplasia because there was no significant difference with advancing age and gender, as well as relatively small standard deviations.
Acetabulum/radiography* ; Acetabulum/growth & development ; Adult ; Aged ; Aging/physiology ; Bone Diseases, Developmental/radiography* ; Female ; Human ; Korea ; Male ; Middle Age

Congenital coxa vara is a rare congenital deformity, seen in infancy and childhood and the ratio of unilateral to bilateral is 3:1. The deformity does not become manifest until after birth and usually not until the age of walking. Pathologically, it consists of a progressively increasing acuteness of the neck-shaft angle;shortnees of the neck; a vertical direction of the epiphyseal plate; an oblique defect of the neck; a greater trochanter extending upward toward the ilium as a besk; a shortened femur; a secondary degenerative changese in the acetabulum due to malposition. We have experienced a case of bilateral congenital coxa vara treated with valgue osteotomy and the case review is presented.
Acetabulum ; Congenital Abnormalities ; Coxa Vara ; Femur ; Growth Plate ; Ilium ; Neck ; Osteotomy ; Parturition ; Walking

OBJECTIVETo explore factors influencing acetabular development after closed reduction in developmental dislocation of the hip (DDH), to provide theoretical basis for improving the therapeutic effects of closed reduction treatment of DDH.

METHODSA total of 100 children with single side DDH who were treated by closed reduction from January 2002 to December 2005 were followed up, and the AI and AI (D/W) of dislocation hip were measured at the 12th month after reduction. Ten factors such as gender, side, age, AI and AI (D/W) of dislocation hip before reduction, degree of dislocation, the rate of width of femoral head, femoral neck anteversion of dislocation hip before reduction, h/b rate,cut off adductor and skeletal traction et al were taken as independent variable, AI and AI (D/W) at the 12th month after reduction were taken as dependent variable,then multiple linear stepwise regression analysis was used to screen the major influencing factors.

RESULTSAge, gender, degree of dislocation, h/b rate, the rate of width of femoral head and femoral neck anteversion exerted obviously influence on AI and AI (D/W),and then age,degree of dislocation and FNA had positive correlation with AI and negative correlation with AI (D/W); the rate of width of femoral head and h/b rate had negative correlation with AI and positive correlation with AI(D/W). The development of acetabular of female patients was faster than that of male patients.

CONCLUSIONAge, gender,degree of dislocation, concentric reduction or not, the development degree of femoral head before reduction and proximal femoral shape are the major factors influencing acetabular development.

Acetabulum ; abnormalities ; growth & development ; surgery ; Age Factors ; Child, Preschool ; Female ; Hip Dislocation ; surgery ; Humans ; Infant ; Male ; Sex Factors ; Treatment Outcome

It has been known that osseous stability of the hip is dependent upon the inclination, anteversion and depth of acetabulum and also upon neck-shaft angle and anteversion of femur. Acetabulum enlarges from two different growth centers; one from the concave articular surface cartilage and the other from the triradiate cartilage. The former contributes primarily to the thickness of acetabular wall, where as, the latter to the central enlargement of the acetabular socket. Additionally the shape of acetabulum can be changed by deformity of the femoral head and neck, which can be explained by Wolff's and Hueter-Volkmann's laws. Yet there are still many factors to be clarified by clinical researchers in the future Authors in this experiment tried to clarify the role of triradiate cartilage and greater trochanteric growth plate upon the development of acetabulum. The material used for this study consiated of 30 rabbits of both sexes, aged 8 weeks. Animals were divided into 3 groups, and each group consisted of 10 rabbits In group I. hip was not injured and used as a Control: in group II, right greater trochanter with its growth plate was destructed completely; in group III, triradiate cartilage of right side was destructed. Subsequent to injury of Y cartilage ot greater trochanter with its growth plate, radiographs of the pelvis including hips were obtained weekly on each rabbit over 6 weeks period. and to evaluate the effect of injury upon the hip development acetatular angle, C-E angle, and acetabular depth and width were measured. The following results were obtained; 1. The shape of acetabulum of rabbits have showe remarable developmental changes until the 10 weeks of age after birth, but the changes became less remarkable by age of the 14 weeks. Thereafter it remained unchanged. 2. In group II, at the age of 14 weeks, compared with the values of the normal hip, the acetabular angle showed an increase of 1.9 degrees, and the center dege angle and acetabular depth showed a decrease of 3.21 degrees and 0.43mm respectirely. 3. In group III, at the age of 14 weeks, compared with the values of the normal hip, the acetabular angle increased by 18.9 degress while the center-edge angle decreased by 22.8 degrees. The acetabular depth showed a decrease of 1.81mm and the acetabular width showed an increase of 0.73mm. These observations suggest that the development of acetabulum depends largely upon the growth of triradiate cartilage, and also is affected secondarily by valgalization of femoral neck which is resulted by destruction of greater trochanteric growth cartilage.
Acetabulum ; Animals ; Cartilage ; Congenital Abnormalities ; Femur Neck ; Femur ; Growth Plate ; Head ; Hip ; Jurisprudence ; Neck ; Parturition ; Pelvis ; Rabbits

OBJECTIVEBy establishing a model of straight-leg swaddle of newborn rats and observing the experimental animals'hips morphologically and pathologically, this study explored the changes of gross appearance of the acetabulum and the maturity of cartilage cells in the different regions of acetabular cartilage complex.

METHODSThe legs and hips were fixed by adhesive tape for 10 days in the position of hip extension and adduction in 31 newborn Wistar rats (experimental group). The other 31 newborn rats without legs and hips treatment were used as the control group. After 10 days raising in the same condition, all the rats were sacrificed. The gross appearance, histological observations and VEGF and type X collagen immunohistochemistry were used for examining the acetabulum changes.

RESULTSA straight leg swaddle model of newborn rats was established successfully. In the experimental group the acetabulum became shallow and small and surrounded by more soft tissues. There were 49 dislocated hips (49/54) in the experimental group and 2 hips dislocated (2/60) in the control group (p<0.01). Fake acetabulum appeared in the experimental group. In the control group, the shape of the acetabulum was normol, and no fake acetabulum was found. The safranin O-fast green staining showed that the orange-red cartilage in the experimental group was wider than the control group. Immunohistochemistry observations showed VEGF and type X collagen immunoreactivities in the hypertrophic layer of the acetabular cartilage complex in the experimental group were lower than those in the control group. The percentages of VEGF positive and type X collagen positive cells in the iliac hypertrophic layer of the acetabular articular cartilage were significantly higher than those in the ischiadic ramus and the pubic branch in the experimental group.

CONCLUSIONSVEGF and type X collagen immunoreactivities in acetabular cartilage cells decrease in a straight-leg swaddle model of newborn rats. This suggests that this position might lead to dysmaturity of the acetabular cartilage cells and affect the development of the acetabulum.

Acetabulum ; growth & development ; pathology ; Animals ; Animals, Newborn ; Bone Development ; Cartilage ; growth & development ; pathology ; Collagen Type X ; analysis ; Disease Models, Animal ; Female ; Hip Dislocation, Congenital ; metabolism ; pathology ; Immunohistochemistry ; Male ; Rats ; Rats, Wistar ; Vascular Endothelial Growth Factor A ; analysis