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. 2011 Dec 9;470(6):1696–1704. doi: 10.1007/s11999-011-2177-3

Fig. 1.

Fig. 1

The Martell method of linear wear measurement is shown in this radiograph. The circles that best fit the femoral head and acetabular cup are detected by the software. The direction of the head penetration is automatically calculated as shown.