Characterizing upper extremity kinematics in typically developing children during box and blocks test.

Area of Science:

• Biomechanics
• Pediatric Motor Development
• Rehabilitation Science

Background:

• Upper extremity (UE) kinematics are crucial for assessing functional ability and performance.
• The Box and Blocks test (BBT) is a common measure of manual dexterity but does not capture kinematic details.
• Understanding movement patterns is vital for evaluating children's functional performance.

Purpose of the Study:

• To investigate the correlation between UE kinematics and cycle time per block movement during the BBT in 7-, 9-, and 11-year-old children.
• To determine if BBT scores alone adequately represent UE movement mechanics in a pediatric population.

Main Methods:

• Three-dimensional motion capture was used to record hand velocity, position, and joint angles (shoulder, elbow, wrist) during the BBT.
• Kinematic data were analyzed for block movements, focusing on cycle time and peak joint angles.
• A mixed-effects model and Pearson's Correlation Coefficients were employed to analyze group differences and correlations.

Main Results:

• Significant differences in BBT scores and peak shoulder flexion/abduction were observed between 7- and 11-year-olds.
• Peak elbow flexion differed between 9- and 11-year-olds.
• Correlations between cycle time and kinematic measures were weak, indicating limited representativeness of BBT scores alone.

Conclusions:

• BBT scores alone are insufficient to represent UE kinematics in children.
• Comprehensive assessment requires collecting both BBT performance scores and detailed kinematic data.
• This approach offers deeper insights into pediatric movement mechanics during functional tasks.