[Simulated Total Wrist Fusion and its Influence on Hand Grip Function]

Area of Science:

• Orthopedics
• Hand Surgery
• Biomechanics

Background:

• Wrist fusion is a common surgical procedure for advanced arthritis.
• Patients often fear functional limitations post-surgery.
• Understanding the impact on grip function is essential for patient counseling.

Purpose of the Study:

• To evaluate how simulated wrist fusion in different positions affects dynamic grip function and strength.
• To assess the influence of restricted wrist motion on various grip types.

Main Methods:

• Nineteen healthy subjects participated in the study.
• Wrist fusion was simulated in 20° extension and 20° flexion.
• A TUB sensor glove dynamically recorded finger joint range of motion (ROM) and grip strength during standardized grip tasks.

Main Results:

• Simulated wrist fusion in 20° extension did not affect finger ROM, grip speed, or strength.
• Fusion in 20° flexion did not influence finger ROM or grip speed.
• A significant decrease in grip strength (23-42%) was observed in the 20° flexion position compared to extension or healthy wrists.

Conclusions:

• Lack of wrist motion does not impede finger movement during forceful hand grip at normal speeds.
• A notable reduction in grip strength occurs with the wrist in a flexed position after fusion.
• This loss of grip strength in flexion should be considered for patients requiring bilateral wrist fusion.