Fig. 1From: The linea aspera as a guide for femoral rotation after tumor resection: is it directly posterior? A technical note a Reference level (line A) and intersection between the posterior condylar line and its perpendicular (line B). b Tangent to lips of linea aspera (line C) and its perpendicular (line D). ARLA is the angle between B and D. c–e The ARLA measured at different levelsBack to article page