Gluteus Medius ve Minimus Kas Kalınlığının Üç Aya Kadar Gelişimsel Kalça Displazisi Üzerine Etkisi

-Purpose: To investigate whether there is a difference in the gluteus medius and minimus muscle thicknesses between the cases with Graf method type IIa and normal subjects. -Methods: A total of 200 cases, 1-3 months old infants, who applied to our hospital for developmental hip dysplasia ultrasound scanning between January 2021 and March 2021 were included in our study. The cases were evaluated with a standard coronal plane with a 9-12 MHz linear array probe according to the Graf method at the level of the triradiate cartilage by the same radiologist. The largest gluteus medius and minimus muscle thickness were measured. -Results: The female to male ratio was 0.9. and the mean age was 43.9 ± 13.7 days. The present study had 159 (79.5%) Graf type I (Group A) and 41 newborns (20.5%) with Graf type IIa (Group B). Demographic and clinical characteristics were similar in both groups (p>0.05). The mean lengths of the gluteus medius and minimus muscles were similar in newborns with Graf type I and IIa (p=0.975 and p=0.069, respectively). A significant difference was found in the mean length of the gluteus minimus muscle between male and female newborns (p=0.001). The muscle length was statistically shorter in the female newborns than the male newborns (3.4 ± 0.5 mm vs. 3.6 ± 0.5 mm). -Conclusion: Since there was no difference in gluteal muscle thickness between mature and immature hips; Gluteal muscle lengths are not a diagnostic landmark in the hip ultrasound scan.