坐位定点旋腰法运动学与力学关键参数研究OA

Objective This study aims to collect and analyze the key kinematic and mechanical parameters during the seated fixed-point lumbar rotational manipulation,establish a basic biomechanical characteristic model for this manipulation,and provide a quantitative basis for its standardized operation and training in the field of spinal rehabilitation.Methods From February to July 2024,10 healthy participants who underwent physical examination at the Physical Examination Department of The Affiliated Peo-ple's Hospital of Fujian University of Traditional Chinese Medicine were selected.The seated fixed-point lumbar rotation manipula-tion was performed by senior inheritors of the traditional Chinese tuina.A three-dimensional motion capture system,a pressure-sensi-tive film force measurement system,and force plates for the lower limbs were synchronously adopted to collect the range of motion of the operator's bilateral major limb joints,as well as the upper limb contact forces and the ground reaction force of the lower limbs.The force variation curves of the operator's upper and lower limbs were plotted and analyzed.Differences in kinematic and mechani-cal parameters between left-sided and right-sided rotational manipulation were compared,and correlation analysis was conducted.Results Kinematics:During the manipulation,the flexion-extension angles of the operator's bilateral elbow,hip,and knee joints varied considerably,with ranges of motion all>60°;the ranges of motion of the wrist,shoulder,and ankle joints were relatively small,all<25°.When comparing left-sided and right-sided rotational manipulation,there were no statistically significant differences in the range of motion of the elbow,hip,and knee joints on the traction side and the rotational manipulation side(P>0.05).Positive correlations were identified among the flexion-extension angles of the elbow,hip,and knee joints(P<0.05).Kinetics results:The force curves of the operator's bilateral upper limbs were highly similar,each displaying a small peak(preloading phase with gradual force delivery)and a large peak(rotational manipulation phase with burst force delivery),with generally consistent variation in am-plitudes and peak onset points.Preloading phase:the upper limb preloading time tupper preload=(442.43±20.12)ms,and the rising slope Kupper preload=0.023 N/ms;rotational manipulation phase:the upper limb rotational manipulation time tupper rotation=(102.32±9.29)ms,and the rising slope Kupper rotation=0.032 N/ms.In addition to supporting the operator's own body weight,the lower limbs generated additional exertion force.During the vertebral"locking"process(preloading phase with force accumulation):the lower limb preload-ing time tlower preload=(71.09±4.34)ms,and the rising slope Klower preload=0.179 N/ms;during the rotational manipulation phase(rotation-al manipulation with rapid backward and upward force):the lower limb rotational manipulation time tlower rotation=(16.27±1.52)ms,and the rising slope Klower rotation=1.076 N/ms.When comparing left-sided and right-sided rotational manipulation,there were no statistically significant differences in the thumb preloading force,thumb peak rotational force,palm preloading force,palm peak rota-tional force,upper limb preloading force,upper limb peak rotational force,lower limb preloading force,and lower limb peak rota-tional force(P>0.05).Positive correlations were observed among the operator's upper limb mechanical parameters and between the combined upper and lower limb mechanical parameters(P<0.05).Conclusion During the seated fixed-point lumbar rotation ma-nipulation,the operator's elbow,hip,and knee joints exhibited a coordinated and continuous flexion-extension movement pattern.The force exertion of the upper and lower limbs demonstrated a sequential characteristic of"preloading with gradual increase fol-lowed by rapid burst force during rotational manipulation",with lower limb participation throughout the entire process and highly co-ordinated with the upper limbs.This study preliminarily clarified the motor control pattern and safe loading range of this manipula-tion,providing quantitative baseline data for the standardized training,operational safety assessment,and subsequent clinical re-search of spinal rehabilitation manipulations.