Outcome prognostic factors in MRI during spica cast therapy treating developmental Hip dysplasia with midterm follow-Up

Closed reduction followed by spica casting is a conservative treatment for developmental dysplasia of the hip (DDH). Magnetic resonance imaging (MRI) can verify proper closed reduction of the dysplastic hip. Our aim was to find prognostic factors in the first MRI to predict the possible outcome of t...

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Main Authors: Gather, Katharina Susanne (Author) , Mavrev, Ivan (Author) , Gantz, Simone (Author) , Dreher, Thomas (Author) , Hagmann, Sébastien (Author) , Beckmann, Nicholas A. (Author)
Format: Article (Journal)
Language:English
Published: 7 July 2022
In: Children
Year: 2022, Volume: 9, Issue: 7, Pages: 1-13
ISSN:2227-9067
DOI:10.3390/children9071010
Online Access:Resolving-System, kostenfrei, Volltext: https://doi.org/10.3390/children9071010
Verlag, kostenfrei, Volltext: https://www.mdpi.com/2227-9067/9/7/1010
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Author Notes:Katharina Susanne Gather, Ivan Mavrev, Simone Gantz, Thomas Dreher, Sébastien Hagmann and Nicholas Andreas Beckmann

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520 |a Closed reduction followed by spica casting is a conservative treatment for developmental dysplasia of the hip (DDH). Magnetic resonance imaging (MRI) can verify proper closed reduction of the dysplastic hip. Our aim was to find prognostic factors in the first MRI to predict the possible outcome of the initial treatment success by means of ultrasound monitoring according to Graf and the further development of the hip dysplasia or risk of recurrence in the radiological follow-up examinations. A total of 48 patients (96 hips) with DDH on at least one side, and who were treated with closed reduction and spica cast were included in this retrospective cohort study. Treatment began at a mean age of 9.9 weeks. The children were followed for 47.4 months on average. We performed closed reduction and spica casting under general balanced anaesthesia. This was directly followed by MRI to control the position/reduction of the femoral head without anaesthesia. The following parameters were measured in the MRI: hip abduction angle, coronal, anterior and posterior bony axial acetabular angles and pelvic width. A Graf alpha angle of at least 60° was considered successful. In the radiological follow-up controls, we evaluated for residual dysplasia or recurrence. In our cohort, we only found the abduction angle to be an influencing factor for improvement of the DDH. No other prognostic factors in MRI measurements, such as gender, age at time of the first spica cast, or treatment involving overhead extension were found to be predictive of mid-term outcomes. This may, however, be due to the relatively small number of treatment failures. 
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