An index to quantify deviations from normal trunk mobility: Clinical correlation and initial test of validity

Area of Science:

• Biomechanical analysis
• Rehabilitation science
• Clinical biomechanics

Background:

• Chronic low back pain (CLBP) is associated with altered hip, pelvis, and trunk movements.
• Quantifying these movement differences compared to healthy individuals is complex due to numerous variables.
• Clinical interpretation of range of motion data in CLBP patients presents challenges.

Purpose of the Study:

• To develop and validate a novel index for quantifying trunk mobility in CLBP patients.
• To assess the relationship between this index, psychosocial impact, and rehabilitation outcomes.
• To establish a tool for evaluating the effectiveness of functional restoration programs.

Main Methods:

• Principal Component Analysis (PCA) was employed to analyze kinematic data.
• Trunk and pelvic kinematic data were collected from CLBP patients and a control group during various movements.
• PCA reduced 10 discrete kinematic variables into 10 independent variables for index calculation.

Main Results:

• A new index was developed by summing the principal component variables.
• The index demonstrated clinical utility and statistical validity.
• Significant correlations were found between the index, psychosocial impact of CLBP, and positive rehabilitation effects.

Conclusions:

• The developed index provides an objective measure of trunk mobility in CLBP.
• It allows for the assessment of absolute kinematic benefits from rehabilitation programs.
• This tool can enhance the evaluation of functional restoration efficacy in CLBP management.