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Fig. 2 | Journal of Orthopaedic Surgery and Research

Fig. 2

From: Anatomical relation between S1 sacroiliac screws’ entrance points and superior gluteal artery

Fig. 2

Two horizontal lines were drawn through the bilateral sacroiliac joints from the right to the left in S1 segment, and they were limited in the bone substance and could not break both the front and back margins of sacrum, canales sacralis, nor sacral foramen. The two lines were defined respectively as passing through the anterior and posterior edges of the bone substance of the pelvic posterior ring. The intersection points of the two lines and the outer margins of ilium were marked and named as point As (S1 sacroiliac screw entrance points)

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