The Effect of gluteus medius and minimus muscle thickness on developmental hip dysplasia up to three months of age

Abstract

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 45.9±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.

Keywords

• Developmental dysplasia of hip
• hip ultrasound
• gluteus medius muscle
• gluteus minimus muscle
• Graf method

Gluteus medius ve minimus kas kalınlığının üç aya kadar gelişimsel kalça displazisi üzerine etkisi

Öz

Amaç: Graf yöntemi tip IIa olguları ile normal olgular arasında gluteus medius ve minimus kas kalınlıkları açısından fark olup olmadığını araştırmaktır.
Gereç ve yöntem: Ocak 2021-Mart 2021 tarihleri arasında gelişimsel kalça displazisi ultrason taraması için hastanemize başvuran, yaş aralığı 1-3 aylık arası olan, toplam 200 olgu çalışmamıza dahil edildi. Olgular aynı radyolog tarafından, Graf yöntemine göre 9-12 Mhz lineer array prob ile standart koronal düzlemde triradiat kıkırdak seviyesinde değerlendirildi. En geniş gluteus medius ve minimus kas kalınlığı ölçüldü.
Bulgular: Kadın erkek oranı 0,9’du ve ortalama yaş 45,9±13,7 gündü. Bu çalışmada 159 (%79,5) Graf tip I (Grup A) ve 41 (%20,5) Graf tip IIa (Grup B) yenidoğan vardı. Demografik ve klinik özellikler her iki grupta benzerdi (p>0,05). Graf tip I ve IIa olan yenidoğanlarda gluteus medius ve minimus kaslarının ortalama kalınlıkları benzerdi (sırasıyla p=0,975 ve p=0,069). Erkek ve kız yenidoğanlar arasında gluteus minimus kasının ortalama kalınlığında anlamlı bir fark bulundu (p=0,001). Kas kalınlığı, kız yenidoğanlarda erkek yenidoğanlara göre istatistiksel olarak daha kısaydı (3,4±0,5 mm'ye karşı 3,6±0,5 mm).
Sonuç: Matür ve immatür kalçalar arasında gluteal kas kalınlıkları açısından fark olmadığı için; gluteal kas uzunlukları, kalça ultrason taramasında tanısal bir nirengi noktası değildir.

Anahtar Kelimeler

• Gelişimsel kalça displazisi
• kalça ultrasonu
• gluteus medius kası
• gluteus minimus kası
• Graf metod

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