During intermittent mechanical compression, what is the position of the limb?

• A. Supine with legs extended
• B. Prone with knee flexed
• C. Limb elevated approximately 45 degrees and abducted 20-70 degrees
• D. Seated with legs dangling

Answer: (C)

Intermittent mechanical compression works best when the limb is positioned to promote venous return and minimize venous stasis. Elevating the limb shifts hydrostatic pressure toward the heart, helping blood and lymph drain proximally and reducing edema. About 45 degrees provides substantial elevation without compromising arterial inflow or comfort, making drainage more efficient.

Adding a bit of abduction, about 20 to 70 degrees, helps align the leg so the venous pathways drain effectively and the compression cuffs sit evenly without pinching behind the knee or at the thigh. This slight outward positioning also reduces the risk of constricting vessels or nerves and promotes smoother, more uniform tissue compression.

In contrast, keeping the leg in a fully dependent position or with the knee bent or dangling tends to hinder drainage and counteracts the benefits of intermittent compression.