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The starting point of the osteotomy is slightly medial to the iliopectineal eminence (black arrow). Vertical orientation of the osteotome (left image) may create a risk of articular penetration. Inclining the osteotome 45° (right image) allows avoidance of the joint and ends medial to the obturator nerve (white arrow in left image). The dotted line (left image) indicates the acetabular border.
