Radiologic Predictors for Clinical Improvement in PAO-A Perspective Study

Area of Science:

• Orthopedic Surgery
• Radiology
• Biomedical Engineering

Background:

• Developmental dysplasia of the hip (DDH) is a condition requiring surgical intervention for optimal outcomes.
• Periacetabular osteotomy (PAO) is a surgical procedure used to treat DDH.
• Identifying key radiological parameters is crucial for predicting surgical success in PAO.

Purpose of the Study:

• To evaluate the clinical and radiological outcomes of PAO in treating DDH.
• To determine specific radiological parameter values predictive of optimal clinical results after PAO.
• To establish criteria for patient selection for PAO based on radiological measurements.

Main Methods:

• Radiological assessment included center-edge angle (CEA), medialization, distalization, femoral head coverage (FHC), and ilioischial angle.
• Clinical evaluation utilized Harris Hip Score (HHS), WOMAC, Merle d'Aubigne-Postel scales, and Hip Lag Sign (HLS).
• Statistical analysis compared pre- and post-operative measurements and identified correlations between radiological parameters and clinical outcomes.

Main Results:

• PAO resulted in significant improvements: increased CEA (16.3°) and FHC (15.2%), decreased medialization (3.4 mm) and distalization (3.5 mm).
• Clinical scores improved, with higher HHS (22 points) and Postel-d'Aubigne (3.5 points), and reduced WOMAC scores (24%).
• HLS improved in 67% of patients, indicating functional recovery.

Conclusions:

• PAO effectively treats DDH, improving both radiological parameters and clinical function.
• Optimal patient selection for PAO should consider CEA < 26°, FHC < 75%, and ilioischial angle > 85.9°.
• Achieving optimal clinical results necessitates increasing CEA by 11°, FHC by 11%, and decreasing the ilioischial angle by 3° post-surgery.