Palmer et al. used a triaxial electrogoniometer in 10 normal subjects performing 52 standardized tasks to determine how much wrist motion is actually required for daily activities. The goal was not to measure maximum range, but to define the functional arc used in real-world tasks. This distinction directly informs counseling and surgical planning for wrist fusion, arthroplasty, and proximal row carpectomy.
A patient asking whether wrist fusion will ruin their life needs a specific answer, not reassurance. This paper gives you the numbers: if their residual motion falls within 5° flexion, 30° extension, 10° radial, and 15° ulnar deviation, they can perform the vast majority of daily tasks.
When planning a limited or total wrist arthrodesis, the target position should sit within this functional arc — extension with mild ulnar deviation aligns with how the wrist is used in 21 of 24 common tasks. A fusion placed in flexion or radial deviation falls outside the natural centroid for nearly every daily activity.
The rotation data carry a direct implant design implication: any wrist prosthesis that constrains motion to two axes will be subjected to rotational loads it cannot accommodate during every single task, explaining the historically high loosening rates of early constrained wrist implants.
For the boards and for clinic: secretarial workers need the least wrist motion of any occupational group, while personal hygiene demands the most. Useful context when counseling patients about return to specific activities after injury or reconstruction.
Palmer et al. used a triaxial electrogoniometer in 10 normal subjects performing 52 standardized tasks to determine how much wrist motion is actually required for daily activities. The goal was not to measure maximum range, but to define the functional arc used in real-world tasks. This distinction directly informs counseling and surgical planning for wrist fusion, arthroplasty, and proximal row carpectomy.
A patient asking whether wrist fusion will ruin their life needs a specific answer, not reassurance. This paper gives you the numbers: if their residual motion falls within 5° flexion, 30° extension, 10° radial, and 15° ulnar deviation, they can perform the vast majority of daily tasks.
When planning a limited or total wrist arthrodesis, the target position should sit within this functional arc — extension with mild ulnar deviation aligns with how the wrist is used in 21 of 24 common tasks. A fusion placed in flexion or radial deviation falls outside the natural centroid for nearly every daily activity.
The rotation data carry a direct implant design implication: any wrist prosthesis that constrains motion to two axes will be subjected to rotational loads it cannot accommodate during every single task, explaining the historically high loosening rates of early constrained wrist implants.
For the boards and for clinic: secretarial workers need the least wrist motion of any occupational group, while personal hygiene demands the most. Useful context when counseling patients about return to specific activities after injury or reconstruction.