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Alpha Angle Calculations.
A. AP radiograph depicting alpha angle calculation including (alpha 1= alpha maximum) and excluding the osteophyte (alpha 2 = alpha minimum).
B. Frog leg lateral radiograph in a different patient similarly depicting alpha angle calculation including (alpha 1 = alpha maximum) and excluding (alpha 2 = alpha minimum) the osteophyte.
*Alpha angle measurements excluding osteophytes were made using the sclerotic outline of the femoral neck.
