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1.6 cm
4%
149/3492
2 cm
7%
239/3492
3.2 cm
82%
2857/3492
4 cm
5%
179/3492
6.4 cm
1%
52/3492
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Using the arithmetic method, the anticipated correction is 3.2 cm (1cm/yr for distal femur + 0.6cm/yr for proximal tibia x 2 years of growth remaining in boys). There are four common methods to determine leg length remaining: 1. Growth remaining method. 2. Arithmetic method. 3. Straight line graphic method. 4. Multiplier method. Arithmetic is the easiest but least accurate. This method assumes a few basic principles: growth of the distal femur is 1 cm per year, growth of the proximal tibia is 0.6 cm per year, boys reach skeletal maturity at 16 years, and girls at 14 years. The article by Westh and Menelaus and review article by Stanitski discuss the evaluation and treatment options for leg-length discrepancy.
3.7
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