Detecting asymmetries in balance control with system identification: first experimental results from above knee amputees

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

2 Citations (Scopus)
7 Downloads (Pure)


A prosthetic leg can influence balance in various ways, but not all changes in postural performance can easily be identified with the naked clinical eye. Various studies have shown that dynamic posturography is able to detect more subtle changes in balance control. Here, we describe a modification of a new posturography technique we previously developed, which combines dynamic platform perturbations with (non) parametric system identification techniques to detect asymmetries in balance control of four subjects with an above knee prosthesis. The method also estimates the mechanical impedance of the prosthetic ankle joint. The time needed for the experiment and data analysis is less than 3 minutes. Results were compared to those of six healthy controls. Our pilot data show clear asymmetries in dynamic balance control. We also found asymmetries in weight bearing and centre of pressure movements, but the asymmetries in dynamic balance contribution were larger. Finally, asymmetries in weight bearing and dynamic balance in patients were not tightly coupled as in healthy controls. The relative contribution to dynamic balance control of the prosthetic leg was positively related with the stiffness of the prosthetic ankle joint. More transfemoral amputees have to be tested to more extensively evaluate the results of this pilot study.
Original languageUndefined
Title of host publicationProceedings of the 2007 IEEE 10th International Conference on Rehabilitation Robotics. Noordwijk, the Netherlands
EditorsB. Driessen, J.L. Helder, G.J. Gelderblom
Place of PublicationPiscataway, NJ, USA
ISBN (Print)978-1-4244-1320-1
Publication statusPublished - 13 Jun 2007
EventIEEE 10th International Conference on Rehabilitations Robotics, ICORR 2007: Robots care! - Noordwijk, Netherlands
Duration: 13 Jun 200715 Jun 2007
Conference number: 10

Publication series



ConferenceIEEE 10th International Conference on Rehabilitations Robotics, ICORR 2007
Abbreviated titleICORR


  • METIS-240781
  • IR-98208

Cite this