In a KAFO with an offset joint, where is the hinge located?

In a KAFO with an offset joint, where is the hinge located?

• A. Posterior to midline of the leg
• B. Anterior to midline
• C. Lateral to midline
• D. Medial to midline

Answer: (A)

Offsetting the knee joint in a KAFO means the hinge axis is moved behind the leg’s midline. This posterior placement lines the brace’s knee axis up with the natural center of rotation of the knee, improving control during stance and allowing smoother flexion without the brace catching on tissue or causing anterior impingement. If the hinge were anterior to midline, the axis would be misaligned with the knee’s rotation, leading to unstable control and tissue irritation. A lateral or medial offset would shift the axis side-to-side, causing sideways instability and poorer gait mechanics.

Offsetting the knee joint in a KAFO means the hinge axis is moved behind the leg’s midline. This posterior placement lines the brace’s knee axis up with the natural center of rotation of the knee, improving control during stance and allowing smoother flexion without the brace catching on tissue or causing anterior impingement. If the hinge were anterior to midline, the axis would be misaligned with the knee’s rotation, leading to unstable control and tissue irritation. A lateral or medial offset would shift the axis side-to-side, causing sideways instability and poorer gait mechanics.