Static knee alignment for stability is achieved when the lateral reference line falls relative to the knee joint axis:

Static knee alignment for stability is achieved when the lateral reference line falls relative to the knee joint axis:

• A. Posterior to axis
• B. Anterior to axis
• C. Medial to axis
• D. Lateral to axis

Answer: (B)

Static knee stability in standing comes from where the weight-bearing line lies relative to the knee’s hinge axis. When the lateral reference line is anterior to that axis, gravity creates an extension moment that tends to keep the knee straight, compress the joint surfaces, and tighten supporting structures—all of which help lock the knee in a stable extended position. If the line were behind the axis, gravity would promote a flexion tendency, reducing stability. Medial or lateral positioning mainly affects frontal plane alignment, but for the stability in standing, the crucial factor is being anterior to the axis.

Static knee stability in standing comes from where the weight-bearing line lies relative to the knee’s hinge axis. When the lateral reference line is anterior to that axis, gravity creates an extension moment that tends to keep the knee straight, compress the joint surfaces, and tighten supporting structures—all of which help lock the knee in a stable extended position. If the line were behind the axis, gravity would promote a flexion tendency, reducing stability. Medial or lateral positioning mainly affects frontal plane alignment, but for the stability in standing, the crucial factor is being anterior to the axis.