Sliding and Lower Limb Mechanics during Sit-Stand-Sit Transitions with a Standing Wheelchair

Abstract EN

Purpose.

This study aimed to investigate the shear displacement between the body and backrest/seat, range of motion (ROM), and force acting on the lower limb joints during sit-stand-sit transitions by operating an electric-powered standing wheelchair.

Methods and Materials.

The amounts of sliding along the backrest and the seat plane, ROM of lower limb joints, and force acting on the knee/foot were measured in twenty-four people with paraplegia.

Results.

Without an antishear mechanism, the shear displacement was approximately 9 cm between the user’s body and the backrest/seat surfaces.

During standing up, the user’s back slid down and the thigh was displaced rearward, but they moved in opposite directions when wheelchair sat back down.

A minimum of 60 degrees of ROM at the hip and knee was needed during sit-stand-sit transitions.

The maximal resultant forces acting on the knee restraints could reach 23.5% of body weight.

Conclusion.

Sliding between the body and backrest/seat occurred while transitioning from sitting to standing and vice versa.

A certain amount of ROM at lower limb joints and force acting on the knee was necessitated during sit-stand-sit transitions.

Careful consideration needs to be given to who the user of the electric powered standing wheelchair is.