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A 90 mm 22 G bevelled spinal needle (Quincke) was inserted perpendicular to skin, just superior to iliac crest (2-3 cm) within lumbar triangle of Petit and slightly behind the midaxillary line.
The major difference in needle insertion technique is that the needle is inserted perpendicular to the skin over the triangle of Petit for the blind technique; whereas the needle insertion point is more anterior and the needle direction is parallel to the TAP when using ultrasound, so that the needle is imaged in the plane of the beam.
The triangle of petit was identified by palpating the highest point of iliac crest and lower border of thoracic cage anterior to latismus dorsi and posterior to external oblique muscle.

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