Development of a theoretical model for upright postural control in lower limb prosthesis users

Abstract Methods used to assess quiet standing in unilateral prosthesis users often assume validity of an inverted pendulum model despite this being shown as invalid some instances. The aim the current study was evaluate a proposed unilaterally-constrained pin-controller explaining postural control users. Prosthesis were contrasted against theoretical able-bodied controls that stood on platform which unilaterally constrained movement CoP. All participants completed bouts with eyes open, closed and feedback inter-limb weight bearing asymmetry. Correlation coefficients infer behavior both anteroposterior mediolateral directions derived from kinematic (body attached markers) kinetic (centre pressure) experimental data. Larger, negative correlation reflected better adherence, whilst low or no poorer adherence. Inverted data, indicated high magnitude (all cases range 0.71–0.78) (0.88–0.91) directions, irrespective groups. data direction large associated unconstrained/intact limbs (prosthesis users: − 0.45 0.65, group: 0.43 0.72), small constrained/prosthetic 0.02 0.07, 0.13–0.26) combined conditions 0.36 0.56, 0.71 0.82). For direction, negligible for individual (0.03–0.17) moderate correlations, group (− 0.31 0.73). Data suggested users’ individuals’ conforms well predicted by model, has implications fundamental posture transtibial