In knee flexion testing, which fulcrum and landmark configuration is correct?

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Multiple Choice

In knee flexion testing, which fulcrum and landmark configuration is correct?

Explanation:
When assessing knee flexion with a goniometer, you want the axis (fulcrum) to line up with the knee’s rotational center as you bend and extend the joint. The best spot for that fulcrum is the lateral epicondyle of the femur, because that location aligns with the knee’s instantaneous axis of motion in flexion/extension. The proximal reference point should be the greater trochanter so the stationary arm tracks along the femur and isn’t influenced by hip movement. For the distal reference, you want alignment with the distal segment of the leg, typically along the fibula toward the ankle, with the lateral malleolus serving as a reliable distal landmark. This combination—fulcrum at the lateral epicondyle, proximal at the greater trochanter, and distal along the fibula toward the lateral malleolus—best captures true knee motion and yields consistent, accurate measurements. Using other placements (for example, a different knee landmark for the fulcrum or a distal landmark not aligned with the distal leg) can misalign the axis and produce incorrect angles.

When assessing knee flexion with a goniometer, you want the axis (fulcrum) to line up with the knee’s rotational center as you bend and extend the joint. The best spot for that fulcrum is the lateral epicondyle of the femur, because that location aligns with the knee’s instantaneous axis of motion in flexion/extension. The proximal reference point should be the greater trochanter so the stationary arm tracks along the femur and isn’t influenced by hip movement. For the distal reference, you want alignment with the distal segment of the leg, typically along the fibula toward the ankle, with the lateral malleolus serving as a reliable distal landmark. This combination—fulcrum at the lateral epicondyle, proximal at the greater trochanter, and distal along the fibula toward the lateral malleolus—best captures true knee motion and yields consistent, accurate measurements. Using other placements (for example, a different knee landmark for the fulcrum or a distal landmark not aligned with the distal leg) can misalign the axis and produce incorrect angles.

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