Wrist Orthoses Quiz

Orthoses Positioning and Function

• Optimal position for static orthoses promotes comfort and alignment, enhancing healing.
• Key for prehension and grasp with dynamic orthoses is the ability to flex and extend effectively.
• Primary target for grasp and prehension in dynamic orthoses includes the thumb and index fingers.

Joints and Finger Flexion

• Joints responsible for 85% of intrinsic digital flexion are the metacarpophalangeal (MCP) joints.
• The most important joints for finger function, contributing 77% of total finger flexion arc, are the proximal interphalangeal (PIP) joints.
• PIP joints contribute approximately 50% of the overall arc of finger motion.

Statements on Joint Function

• True: PIP joints produce more intrinsic digital flexion than MCP joints.
• True: The arc from 45-90 degrees constitutes normal function for finger motion.
• False: PIP joints contribute 20% to the overall arc of finger flexion; they contribute around 50%.

Thumb Functionality

• In an uninjured patient, the thumb accounts for 40% of overall hand function.
• In an injured patient, the thumb provides approximately 50% of overall hand function.

Prehension and Orthotic Purpose

• Top concerns for positioning and optimization of web space in prehension include maintaining hand function and comfort.
• Orthoses are divided based on their purpose: therapeutic, functional, or protective.
• False: Orthoses can serve multiple purposes, including but not limited to therapeutic applications.