The Effect of the Type of Screw Fixation Used in the Treatment of Slipped Capital Femoral Epiphysis

Figure 1

Neck length to screw length ratio measurement. Length of the screw is first measured, and a second measurement in line with the screw extending from the lateral cortex to the articular surface is then made. This gives a ratio that is used for comparative views. This measurement is used to determine proximal femoral neck growth over time. This method of measuring proximal femoral growth accounts for rotation between films.