Estimating Skeletal Maturity Using Wrist Radiographs During Preadolescence: The Epiphyseal:Metaphyseal Ratio

Area of Science:

• Pediatric Endocrinology
• Radiology
• Orthopedics

Background:

• Skeletal maturity assessment is crucial for treating pediatric conditions like scoliosis and limb length discrepancy.
• Current methods for estimating skeletal maturity in preadolescents using wrist radiographs lack speed, accuracy, and reproducibility.

Purpose of the Study:

• To develop a quick, accurate, and reproducible method for estimating skeletal maturity in preadolescents.
• To compare the accuracy of a novel radiographic parameter-based model with the established Greulich and Pyle (GP) bone age method.

Main Methods:

• Analysis of serial wrist radiographs from 102 children, measuring epiphyseal and metaphyseal widths of 5 physes and 2 styloid heights.
• Development of a skeletal maturity estimation model using stepwise linear regression and generalized estimating equation analyses.
• Inclusion of chronological age (CA), sex, and significant epiphyseal:metaphyseal ratios in the model.

Main Results:

• The developed demographics+ratios model demonstrated superior prediction accuracy compared to GP alone and GP with demographics (mean discrepancy of 0.44 years vs. 0.87 and 0.47 years).
• No significant difference was found in the rate of outlier skeletal age estimates (>1 year discrepancy) between the new model and the demographics+GP model.

Conclusions:

• Measuring epiphyseal:metaphyseal ratios of the first and third metacarpals, alongside CA and sex, significantly improves skeletal maturity estimation over the GP technique.
• This modified wrist skeletal maturity system provides a rapid and reproducible method for assessing skeletal maturity in the juvenile age range.