Is it normal for an infant’s leg creases to be asymmetrical?

Feb 17, 2022 Source: Cainiu Health
Dr. Jiang Zhiyang
Introduction
In most cases, asymmetrical thigh creases in infants are abnormal and are commonly observed in children with congenital hip dislocation. In unilateral hip dislocation, the lower limbs are of unequal length. When the infant lies supine with both knees flexed and feet placed flat on the bed, the heights of the two knees will be unequal. Attempting simultaneous hip abduction reveals markedly restricted abduction in cases of abnormal hip development.

       In most cases, asymmetrical thigh creases in infants are abnormal and are commonly observed in children with developmental dysplasia of the hip (DDH).

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       Generally, hip joint abnormalities may manifest as follows: unequal leg length. With the infant lying supine, gently bring both legs together and compare their lengths. In unilateral hip dislocation, the legs will appear unequal in length. When the infant is supine with knees flexed and feet flat on the bed, the heights of the two knees will differ in cases of unilateral hip dislocation. Attempt simultaneous hip abduction: a normal hip joint can typically abduct to 80–90 degrees, whereas hip dysplasia significantly restricts this range of motion. It is strongly recommended that infants undergo evaluation by a specialist physician to confirm the absence of hip abnormalities before reassurance can be provided.