[Quantification of acetabular coverage in normal adult]

Area of Science:

• Orthopedic surgery
• Biomedical imaging
• Computational geometry

Context:

• Acetabular coverage is crucial for hip joint stability and function.
• Accurate quantification of acetabular coverage is essential for diagnosing hip dysplasia.
• Existing methods for assessing acetabular coverage can be subjective or time-consuming.

Purpose:

• To develop and validate a practical AutoCAD-based program for quantifying acetabular coverage using computed tomography (CT) images.
• To establish quantitative parameters for defining normal and dysplastic acetabular coverage.
• To assess the utility of the program in classifying hip dysplasia types.

Summary:

• A novel Autolisp program integrated with PC AutoCAD quantifies acetabular coverage from CT scans.
• The program digitizes cartilage contours from serial 5 mm CT slices to numerically express coverage.
• Key parameters identified for normal hips include total coverage ratio (>80%), anterior coverage ratio (>75%), and posterior coverage ratio (>80%).
• Polar edge distance is a valuable indicator for pre- and post-operative assessment.
• Medial and lateral coverage ratios are critical for evaluating dysplastic hips, and the program can precisely classify dysplasia types.

Impact:

• Provides a precise, objective, and efficient method for quantifying acetabular coverage.
• Facilitates accurate diagnosis and classification of hip dysplasia, guiding surgical planning.
• Enhances understanding of hip joint biomechanics and coverage parameters.
• Offers a valuable tool for both clinical practice and research in hip joint imaging and analysis.