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One digit interruption: the altered force patterns during functionally cylindrical grasping tasks in patients with

Po-Tsun Chen¹, Chien-Ju Lin², I-Ming Jou³

¹Department of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan.

|January 7, 2014

Summary

This summary is machine-generated.

Trigger digit (TD) affects hand function by altering subtle force coordination. Even single-digit involvement in TD patients changes how fingers work together during grasping tasks.

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Area of Science:

Biomechanics
Hand Surgery
Occupational Therapy

Background:

Trigger digit (TD) significantly impacts daily and occupational hand tasks.
Limited understanding exists regarding TD's effect on fine motor control and inter-digit force coordination.
Investigating force patterns during grasping is crucial for understanding TD's functional deficits.

Purpose of the Study:

To compare force patterns during cylindrical grasp between trigger digit patients and healthy individuals.
To identify differences in force generation and coordination among affected digits in TD patients.
To explore the impact of single-digit TD involvement on overall hand manipulation.

Main Methods:

Forty-two TD patients (single digit involvement) and 12 healthy controls participated.
Participants performed two tasks: holding and drinking, using natural grasping with minimal force.
Force coordination was analyzed using Pearson correlation coefficients and independent t-tests.

Main Results:

All TD groups exhibited altered thumb-to-finger force correlation patterns.
Patients with index finger involvement showed increased index finger force during holding.
TD patients with thumb or middle finger involvement demonstrated higher index finger contribution during drinking.

Conclusions:

Even isolated trigger digit involvement disrupts subtle inter-digit force coordination during simple hand tasks.
Altered force patterns in TD patients suggest compensatory mechanisms and potential secondary injuries.
Findings inform future research on TD-related injuries and treatment strategies.