Orthopedics

Limb Length Discrepancy & Epiphysiodesis Timing (Menelaus / Green-Anderson)

Calculates predicted leg length discrepancy at skeletal maturity and timing for surgical epiphysiodesis.

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Parameters

Limb Length Discrepancy & Epiphysiodesis Timing (Menelaus / Green-Anderson) Result

Formula

Menelaus "Rule of Thumb" & Green-Anderson Growth Nomogram:
Distal Femur = 9 mm/year | Proximal Tibia = 6 mm/year
Timing Age = Maturity Age - (Projected Discrepancy / Physeal Growth Rate)

Clinical Pearls

Accurately plans the precise biological timing of minimally invasive percutaneous epiphysiodesis to equalize leg lengths at skeletal maturity without requiring complex bone lengthening.

Limitations

Calculations assume consistent remaining growth velocities and should be recalibrated on serial 6-month teleoroentgenograms (orthoroentgenograms).