Concurrent validity and test-retest reliability of the Virtual Peg Insertion Test to quantify upper limb function in...

Area of Science:

• Rehabilitation Medicine
• Neuroscience
• Biomedical Engineering

Background:

• Assessing upper limb function is crucial for stroke rehabilitation outcomes.
• The Virtual Peg Insertion Test (VPIT) combines virtual reality and haptic feedback for a goal-oriented task.
• VPIT is derived from the Nine Hole Peg Test (NHPT) to evaluate arm and hand function.

Purpose of the Study:

• To evaluate the concurrent validity of VPIT outcome measures (execution time, dropped pegs) against the NHPT and Box and Block Test (BBT).
• To assess the test-retest reliability of VPIT parameters, including kinetic and kinematic measures, in chronic stroke patients.

Main Methods:

• 31 chronic stroke patients participated in the study.
• Concurrent validity was assessed by administering VPIT, NHPT, and BBT in one session.
• Test-retest reliability was evaluated by re-administering the VPIT 3-7 days later.
• Spearman rank correlation coefficients and intraclass correlation coefficients (ICCs) were used for validity and reliability analyses.

Main Results:

• VPIT showed low correlations with NHPT and BBT for execution time and dropped pegs.
• Good to high test-retest reliability (ICCs 0.83-0.94) was found for execution time, grasping force, zero-crossings, and collision force.
• Fair to poor reliability was observed for other parameters like trajectory error and number of dropped pegs.

Conclusions:

• VPIT is a promising assessment tool for upper limb function in stroke patients, measuring different aspects than NHPT and BBT.
• The test's demanding nature requires a thorough patient introduction.
• VPIT offers more objective and comprehensive upper limb function measurements compared to conventional assessments once patients are familiar with it.