Which phase involves the trailing limb rapidly unloading as weight transfers to the opposite foot?

Which phase involves the trailing limb rapidly unloading as weight transfers to the opposite foot?

• A. Initial swing
• B. Pre-swing
• C. Terminal stance
• D. Mid-swing

Answer: (A)

The key idea here is weight transfer between the legs as you move from stance to swing. The trailing limb rapidly unloads when the body shifts its weight onto the opposite foot, which happens during the pre-swing period—the final portion of stance just before the foot leaves the ground. This unloading happens as you push off with the trailing leg and the opposite leg takes on the body weight, setting up the leg to swing forward. Initial swing, by contrast, is the early part of the leg’s forward movement after toe-off, when the weight transfer has already occurred. Mid-swing and terminal swing are the later portions of the leg’s arc, focused more on advancing and positioning the limb than on unloading the trailing limb.

The key idea here is weight transfer between the legs as you move from stance to swing. The trailing limb rapidly unloads when the body shifts its weight onto the opposite foot, which happens during the pre-swing period—the final portion of stance just before the foot leaves the ground. This unloading happens as you push off with the trailing leg and the opposite leg takes on the body weight, setting up the leg to swing forward. Initial swing, by contrast, is the early part of the leg’s forward movement after toe-off, when the weight transfer has already occurred. Mid-swing and terminal swing are the later portions of the leg’s arc, focused more on advancing and positioning the limb than on unloading the trailing limb.