First, mentally divide one "cheek" into four equal parts. Use the upper outer quadrant for dorsogluteal injections. Yes, at the top of the buttock the sciatic nerve is close to "the crack," but is located wider in lower parts of the glute. It's not easy to hit in the outer upper quadrant, but not altogether impossible. More likely, you may hit the Superior Gluteal Artery, which is not pleasant, and potentially very hazardous, though, due to the smaller diameter of the artery in the region, the outer upper is still your best best. Another thing to consider is the fact that adipose tissue is unpredictable and often varying in this region, making it harder to get an IM injection, vs. the ventrogluteal (hip) site, where adipose tissue is much more thin and consistent. The risk of dosroglute is that of a subcutaneos injection, instead of the preferred deep IM inject. Still, Test can be painful, and ventrogluteal Test injections can leave you with difficulty walking and the like.