Pelvic rotation is described as what?

• A. When one side of the pelvis rotates around a fixed femur on the opposite side
• B. When the pelvis tilts laterally about its vertical axis
• C. When the iliotibial band tightens around the knee
• D. When the femur rotates in its socket

Answer: (B)

Pelvic rotation involves twisting the pelvis in the transverse plane around a vertical axis, so the pelvis turns left or right as a unit. Describing it as tilting laterally about the vertical axis captures that these motions are a sideways twist in the pelvis itself, not a forward/back tilt or a hip/femur rotation. The other options describe different joints or motions—rotation around a fixed femur points to the hip as the pivot, the iliotibial band description is unrelated to pelvis rotation, and femur rotation in its socket is hip rotation, not pelvis rotation.