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Residual dysplasia after successful Pavlik harness treatment: early ultrasound predictors
Venelin Alexandrov Alexiev1, H Theodore Harcke, S Jay Kumar
1Sofia Medical University, Department of Paediatric Orthopaedics, University Orthopaedic Hospital-Gorna Banja, Sofia, Bulgaria.
Insights
Early ultrasound findings in infants with developmental dysplasia of the hip (DDH) can predict long-term acetabular development. Abnormal echogenicity of the cartilaginous roof is a key predictor of residual dysplasia after Pavlik harness treatment.
Area of Science:
- Pediatric Orthopedics
- Medical Imaging
- Developmental Biology
Background:
- Developmental dysplasia of the hip (DDH) is a common condition requiring early intervention.
- The Pavlik harness is a standard treatment for infantile DDH.
- Predicting long-term outcomes, specifically acetabular development, is crucial for managing DDH.
Purpose of the Study:
- To identify early ultrasound characteristics that predict poor acetabular development in children treated with the Pavlik harness for DDH.
- To evaluate the long-term sequelae in infants with DDH treated with the Pavlik harness.
Main Methods:
- Retrospective review of 55 infants (100 hips) with DDH treated with Pavlik harness and followed for at least 4 years.
- Analysis of initial ultrasound findings, including dynamic coverage index, alpha angle, and cartilaginous roof echogenicity.
- Correlation of ultrasound findings with radiographic outcomes, including late acetabular dysplasia and avascular necrosis.
Main Results:
- Pavlik harness treatment was successful in 87% of hips.
- Six percent of successfully treated hips developed late sequelae (acetabular dysplasia or avascular necrosis).
- Three initial ultrasound findings predicted late sequelae: dynamic coverage index ≤22%, alpha angle <43°, and abnormal cartilaginous roof echogenicity. Abnormal echogenicity was the most specific predictor (88% specificity).
Conclusions:
- Early ultrasound assessment, particularly of cartilaginous roof echogenicity, can identify infants with DDH at risk for poor long-term acetabular development despite successful Pavlik harness treatment.
- Abnormal echogenicity suggests early transformation of hyaline cartilage, which may impact midterm acetabular development in unstable hips.
Abstract:
The purpose of this study was to evaluate a group of children treated with Pavlik harness for developmental dysplasia of the hip (DDH) to determine early ultrasound characteristics that predict poor acetabular development after walking age. From a group of 487 infants with DDH, 55 met inclusion criteria of (1) ultrasound documentation of major neonatal hip instability, (2) treatment with Pavlik harness, and (3) a minimum of 4 years of follow-up. These 55 infants had 100 abnormal hips. Harness treatment alone was successful in treating 87 of 100 hips. Persistent or late acetabular dysplasia was defined from serial radiographs. At a mean follow-up of 5.3 years, 5 of the 87 (6%) were found to have sequelae (late acetabular dysplasia, avascular necrosis of the femoral head, or both). Three sonographic findings present on the initial ultrasound predicted late sequelae: (1) dynamic coverage index of 22% or less, (2) alpha angle less than 43 degrees, and (3) abnormal echogenicity of the cartilaginous roof on initial ultrasound. Abnormal echogenicity was the most specific single predictor of residual dysplasia (sensitivity 100% and specificity 88%). The structurally normal cartilaginous roof is non-echogenic except for a short triangular fibrous tip (the labrum). Pathologic cartilage becomes echogenic beyond the tip as hyaline cartilage becomes fibrous and deformed. In unstable hips that respond well to Pavlik harness treatment, it would appear that midterm acetabular development can be affected when early transformation of roof cartilage accompanies displacement and instability.
