Classifying subgroups of chronic low back pain patients based on lifting patterns

Area of Science:

• Biomechanics and Pain Research
• Musculoskeletal Health
• Rehabilitation Science

Background:

• Chronic lower back pain (CLBP) affects a significant portion of the population.
• Lifting patterns may influence pain perception and disability in CLBP patients.
• Current classification systems for CLBP may not fully capture functional differences.

Purpose of the Study:

• To compare self-reported measures between CLBP patients classified into subgroups based on lifting patterns.
• To investigate the relationship between distinct lifting mechanics and pain/psychosocial outcomes in CLBP.

Main Methods:

• A cross-sectional study was conducted in a research laboratory setting.
• Participants included 81 individuals with CLBP and 53 pain-free controls.
• Lifting patterns during a repetitive task were assessed, alongside self-reported disability, pain intensity, and psychosocial factors.

Main Results:

• Two distinct CLBP subgroups emerged: one lifting similarly to controls (n=35) and another lifting significantly differently (n=46).
• The CLBP subgroup with different lifting patterns reported significantly higher pain intensity (P=.005) and pain severity (P=.025).
• This subgroup also exhibited significantly lower self-efficacy (P=.013) compared to the CLBP subgroup with similar lifting patterns.

Conclusions:

• A classification system utilizing lifting patterns successfully identified two distinct CLBP subgroups.
• These subgroups differed significantly in both their physical lifting behaviors and self-reported outcomes.
• The findings underscore the critical role of incorporating physical functioning measures into CLBP classification systems.