Sentence:  True measurements are usually made from the anterior superior spine of the ilium to the tip of the medial malleolus or the femoral adductor tubercle. If possible the limbs should be in corresponding positions and preferably perpendicular to the <WSD>interspinal</WSD> line (Fig. 3–34). 
Meaning of the word marked with <WSD> tags:  Between the (anterior superior iliac spine)s.