Key result
Developmental dysplasia of the hip linked to a less spherical femoral head, rendering concentric reduction impossible.
Why the study?
Is the femoral head aspherical in children with developmental dysplasia of the hip compared to normal hips?
Observational (n=26)
Is the femoral head aspherical in children with developmental dysplasia of the hip compared to normal hips?
Answers are grounded in this paper and cite their sources.
The femoral head in developmental dysplasia of the hip is aspherical, suggesting that the current treatment concept of concentric reduction is impossible and needs reconsideration.
Central to the current treatment of dysplasia of the hip (DDH) is the concept of congruent reduction of the hip. If the femoral head is aspherical in DDH, this concept needs reconsideration. MRI scans are used to examine the femoral head in children. Diameters of 14 DDH and 12 normal hips were measured in three planes by eight observers on two occasions. Femoral head sphericity was determined using the mathematical concept of eccentricity. In DDH, the femoral head was less spherical, most marked in the coronal plane, yielding a 'rugby ball'-shaped femoral head. Accordingly, concentric reduction of the femoral head in DDH is impossible.
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Rosenberg et al. (2016) conducted an observational in Developmental dysplasia of the hip (n=26). Developmental dysplasia of the hip vs. Normal hips was evaluated on Femoral head sphericity determined by eccentricity. Developmental dysplasia of the hip was associated with a less spherical, 'rugby ball'-shaped femoral head compared to normal hips, rendering concentric reduction impossible.
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