Hip joint development in children with type IIb developmental dysplasia

Area of Science:

• Orthopedic surgery
• Pediatric orthopedics
• Developmental dysplasia of the hip

Background:

• Developmental dysplasia of the hip (DDH) is a common condition requiring timely diagnosis and treatment.
• Type IIb DDH, as per Graf's classification, presents specific challenges in management.
• Abduction bracing is a standard treatment modality for DDH.

Purpose of the Study:

• To analyze treatment outcomes for sonographically diagnosed type IIb DDH.
• To identify residual hip dysplasia using clinical and radiological assessments post-treatment.
• To evaluate the long-term efficacy of abduction bracing in type IIb DDH.

Main Methods:

• Retrospective review of 49 children with 59 type IIb and 39 type I hips treated with abduction braces.
• Clinical assessment using McKay classification (Barrett's modification).
• Radiological assessment including standard parameters and Severin classification at mean 9.1-year follow-up.

Main Results:

• Excellent clinical results were observed in all type I and IIb hips.
• No significant statistical differences in radiological parameters or Severin classification between type I and IIb hips.
• 12 out of 49 type IIb hips (24.5%) showed persistent dysplasia based on radiological criteria, with 8 having normal initial sonograms post-treatment.

Conclusions:

• Sonographic normalization does not exclude residual hip dysplasia in type IIb DDH.
• Radiographic monitoring is essential for identifying persistent dysplasia in these patients.
• Continued follow-up until skeletal maturity is recommended for children treated for type IIb DDH.