Multiplier method for limb-length prediction in the upper extremity.

Area of Science:

• Orthopedic surgery
• Pediatric orthopedics
• Limb length discrepancy

Background:

• Limb-length discrepancy affects both upper and lower extremities.
• Current prediction methods primarily focus on lower limbs.
• Paley et al developed the multiplier method for lower limb discrepancy prediction.

Purpose of the Study:

• To develop a multiplier method for predicting upper-limb length discrepancy at skeletal maturity.
• To adapt the established lower-limb prediction methodology for the upper extremity.

Main Methods:

• Utilized radiographic, clinical, and anthropologic databases.
• Calculated multipliers by dividing bone lengths at skeletal maturity by lengths at various ages and percentiles.
• Compared multipliers across different bone segments, percentiles, and demographic groups.

Main Results:

• Upper-extremity multipliers were consistent across percentile groups.
• Multipliers varied primarily with age and gender after one year.
• Demographic factors including ethnicity, nationality, and race did not significantly alter multipliers.

Conclusions:

• The multiplier method provides a straightforward approach for predicting upper-limb growth.
• This method simplifies prediction compared to existing techniques.
• It is applicable for determining epiphysiodesis timing, predicting skeletal maturity bone length, growth remaining, and limb-length discrepancies.