The primary risk factors for leg ulceration in PWID are injecting in the groin and the legs and these are clinically linked to deep vein thrombosis. Injecting into the femoral vein is increasingly common practice for PWID and healthcare practitioners should advise injectors of the increased risk of leg ulceration and DVT and discourage injecting into these areas.
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John Ljungkvist (2006) studied this question.
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