In this study, we attempt to quantify the relation-ship etween significant arm-clutch loading, leg restriction, and motor paralysis, and analyze lumbar joint trajectories in the orthotic gait of paraplegic subjects and in the ordinary and orthotic gaits of a nor-mal subject, by using an inverted pendulum model. With leg restriction, the trajectories are located in front of an equilibrium point of the inverted pendulum, and the loading is higher due to the influence of the gravity moment. Comparing the trajectories of paraplegic and normal gait with orthosis in the hori-zontal plane,the trajectory in the paraplegic subjects was rectilinear, while that in the normal subject was curved in the direction toward the equilibrium point. The loading is lower in the curved trajectory than in the straight trajectory because of the trade-off between gravity and inertia. These results sug-gest that the increase in the distance between the trunk movement and the equilibrium point of the in-verted pendulum results in significant loading due to leg restriction and motor paralysis in the orthotic gait of paraplegics.

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