Medial-lateral GRFs are generally described as what?

Medial-lateral GRFs are generally described as what?

• A. The largest and least variable forces
• B. Equal to vertical GRFs
• C. Present only during swing
• D. Small and more variable across individuals

Answer: (D)

Medial-lateral ground reaction forces are the sideways component of the force the ground exerts during the stance phase. They are small in magnitude compared with the vertical component, because most of the load is carried vertically. Their size and pattern mainly reflect how the body keeps balance side-to-side and how foot placement and leg control are adjusted (step width, foot angle, hip and ankle strategies). Because these factors vary a lot between individuals, the medial-lateral forces show greater inter‑individual variability. They’re not present during swing (there’s no ground contact then), and they’re not the largest or equal to the vertical forces, so those statements don’t fit.

Medial-lateral ground reaction forces are the sideways component of the force the ground exerts during the stance phase. They are small in magnitude compared with the vertical component, because most of the load is carried vertically. Their size and pattern mainly reflect how the body keeps balance side-to-side and how foot placement and leg control are adjusted (step width, foot angle, hip and ankle strategies). Because these factors vary a lot between individuals, the medial-lateral forces show greater inter‑individual variability. They’re not present during swing (there’s no ground contact then), and they’re not the largest or equal to the vertical forces, so those statements don’t fit.