Kinematic quantification of lever positioning manipulation under different working conditions and analysis of related individual factors: an observational cross-sectional study

This study quantitatively analyzed the kinematic characteristics of two LPM working modes using an optical motion capture system. The results indicated that LPM operators demonstrated good consistency in bilateral manipulation. Unilateral LPM showed superior instantaneous kinematic properties and operational efficiency compared to bilateral LPM. Both modes facilitated coordinated lumbar-pelvic-hip regulation with complex parameter interactions. Key kinematic parameters correlated with WC and FL in both modes, while unilateral LPM was further associated with LA and LC. These findings reveal intricate parameter-phenotype couplings and provide empirical support for personalized LPM optimization, underscoring the need for patient-specific manipulation strategies.