Where is the fulcrum for Wrist Flexion measurement?

• A. capitate
• B. lateral wrist triquetrum
• C. radial styloid process
• D. lunate

Answer: (B)

For wrist flexion with a goniometer, the axis should be placed over a stable carpal landmark that roughly follows the radiocarpal joint’s axis of motion. The triquetrum on the ulnar side of the dorsal wrist is the correct fulcrum because the flexion/extension arc of the hand occurs around this region, allowing the goniometer to capture the true angular change as the hand moves toward the palm. Placing the fulcrum on the capitate, the radial styloid, or the lunate would shift the axis away from the actual radiocarpal motion and produce inaccurate measurements, since those landmarks relate to different aspects of wrist movement and do not align consistently with the flexion arc.