Which device has the largest BOS for unilateral use?

Which device has the largest BOS for unilateral use?

• A. Walker
• B. Hemi-walker
• C. Quad cane
• D. Axillary crutches

Answer: (B)

Base of support is about how much surface area and stability the device provides when you rely on it with one side. The hemi-walker stands out because it acts like a wide, one‑sided support frame, giving you a broad footprint on the side you use while still letting you bear weight through that hand and the opposite leg. That wide single-sided base creates the largest effective stability area among unilateral devices. A quad cane, while having a wider tip base than a single cane, is still narrower than the hemi-walker’s reach. Axillary crutches contribute two separate points of contact plus the opposite leg, which doesn’t add as much single-sided stability as a hemi-walker. So the hemi-walker offers the greatest base of support for unilateral use.

Base of support is about how much surface area and stability the device provides when you rely on it with one side. The hemi-walker stands out because it acts like a wide, one‑sided support frame, giving you a broad footprint on the side you use while still letting you bear weight through that hand and the opposite leg. That wide single-sided base creates the largest effective stability area among unilateral devices. A quad cane, while having a wider tip base than a single cane, is still narrower than the hemi-walker’s reach. Axillary crutches contribute two separate points of contact plus the opposite leg, which doesn’t add as much single-sided stability as a hemi-walker. So the hemi-walker offers the greatest base of support for unilateral use.