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Arch Phys Med Rehabil. 2007 Feb;88(2):207-17.

Evaluation of function, performance, and preference as transfemoral amputees transition from mechanical to microprocessor control of the prosthetic knee.

Author information

1
Prosthetics Research Study, Seattle, WA 98104, USA. brian.hafner@prs-research.org

Erratum in

  • Arch Phys Med Rehabil. 2007 Apr;88(4):544.

Abstract

OBJECTIVE:

To evaluate differences in function, performance, and preference between mechanical and microprocessor prosthetic knee control technologies.

DESIGN:

A-B-A-B reversal design.

SETTING:

Home, community, and laboratory environments.

PARTICIPANTS:

Twenty-one unilateral, transfemoral amputees.

INTERVENTION:

Mechanical control prosthetic knee versus microprocessor control prosthetic knee (Otto Bock C-Leg).

MAIN OUTCOME MEASURES:

Stair rating, hill rating and time, obstacle course time, divided attention task accuracy and time, Amputee Mobility Predictor score, step activity, Prosthesis Evaluation Questionnaire score, Medical Outcomes Study 36-Item Short-Form Health Survey score, self-reported frequency of stumbles and falls, and self-reported concentration required for ambulation.

RESULTS:

Stair descent score, hill descent time, and hill sound-side step length showed significant (P<.01) improvement with the C-Leg. Users reported a significant (P<.05) decrease in frequency of stumbles and falls, frustration with falling, and difficulty in multitasking while using the microprocessor knee. Subject satisfaction with the C-Leg was significantly (P<.001) greater than the mechanical control prosthesis.

CONCLUSIONS:

The study population showed improved performance when negotiating stairs and hills, reduced frequency of stumbling and falling, and a preference for the microprocessor control C-Leg as compared with the mechanical control prosthetic knee.

PMID:
17270519
DOI:
10.1016/j.apmr.2006.10.030
[Indexed for MEDLINE]

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