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Birthweight correlates to pubo-femoral distances and α angles in hip ultrasound of newborns at 6 weeks of age: a retrospective cohort study

Authors :
Maria Tirta
Michel Bach Hellfritzsch
Rikke Damkjær Maimburg
Mads Henriksen
Natallia Lapitskaya
Søren Kold
Bjarne Møller-Madsen
Ole Rahbek
Hans-Christen Husum
Source :
Acta Orthopaedica, Vol 94 (2023)
Publication Year :
2023
Publisher :
Medical Journals Sweden, 2023.

Abstract

Background and purpose: There is inconsistency in the literature regarding the relationship between increased birthweight and risk of developmental dysplasia of the hip (DDH). We aimed to investigate the correlation between birthweight and pubo-femoral distance (PFD), as well as Graf’s α angle in newborns undergoing hip ultrasound examination at 6 weeks of age. Patients and methods: Basic newborn characteristics and ultrasound measurements were retrospectively collected during a 1-year study period. We excluded multiple births, newborns born at less than 37 gestational weeks, and incomplete information. Simple and multiple linear regression analyses were performed to evaluate the correlation of birthweight and PFD, and, second, birthweight and α angles including a stratified regression analysis investigating the potential effect modification of sex. Results: 707 newborns (1,414 hips) were included. Mean birthweight was significantly higher for male newborns (P < 0.001). Increased birthweight was positively correlated to PFD values (crude coefficient 0.21, 95% confidence interval [CI] 0.10–0.32) and the correlation was still present after adjusting for sex, family history, and breech presentation (adjusted coefficient 0.18, CI 0.07–0.29). The stratified α angle model for the males was significant for both the crude coefficient (–0.73, CI –1.28 to –0.19) and the adjusted (–0.59, CI –1.15 to –0.03), and also for the females (crude coefficient –1.14, CI –1.98 to –0.31 and adjusted coefficient –1.15, CI –1.99 to –0.31). Conclusion: We found that increased birthweight positively correlated to PFD, and negatively correlated to α angle, but this was not of clinical significance.

Details

Language :
English
ISSN :
17453674 and 17453682
Volume :
94
Database :
Directory of Open Access Journals
Journal :
Acta Orthopaedica
Publication Type :
Academic Journal
Accession number :
edsdoj.f9f29ca816c54ff88a717f4a775c3539
Document Type :
article
Full Text :
https://doi.org/10.2340/17453674.2023.26188