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Effects of a Novel Microprocessor-Controlled Knee, Kenevo, on the Safety, Mobility, and Satisfaction of Lower-Activity Patients with Transfemoral Amputation

Mileusnic, Milana P. PhD; Hahn, Andreas PhD; Reiter, Sebastian MSc

JPO: Journal of Prosthetics and Orthotics: October 2017 - Volume 29 - Issue 4 - p 198–205
doi: 10.1097/JPO.0000000000000146
Case Reports

Introduction Lower-activity persons with transfemoral amputation experience many comorbidities that limit their ability to satisfactorily use prosthetic knees and safely conduct their life activities. Kenevo is a novel microprocessor-controlled knee designed specifically to accommodate the needs of lower-activity individuals with transfemoral amputation.

Materials and Methods A prospective observational study was conducted to collect first clinical experiences with Kenevo. Patient-reported measures were conducted to assess patient safety, mobility on level walking, stairs and ramps, as well as preference. In addition, feedback from certified prosthetists/orthotists was collected regarding fitting process, acclimation, and patient benefits.

Results A total of 29 persons with amputation were fitted with Kenevo. Most of them had unilateral amputations and belonged to the K2 mobility group. Fitting the Kenevo resulted in a positive trend in the Locomotor Capabilities Index 5, Prosthetic Limb Users Survey of Mobility, and Houghton scores (p > 0.05). Kenevo use resulted in a significant reduction of wheelchair dependence for many subjects. Most subjects reported improvements in level walking during various speeds and on uneven ground as well as when walking and standing on ramps and traversing stairs. More than two-thirds of the subjects reported reduction in necessary concentration and perceived exertion when walking with Kenevo. Fear of falling was reduced in 50% of the subjects, whereas the number of subjects who never fell increased from 45% to 72% (p = 0.161) and those who never stumbled from 8% to 50% (p = 0.044). Finally, 89% of the subjects preferred Kenevo to their previous fitting.

Conclusions First routine fittings of the new Kenevo microprocessor-controlled knee suggest that it offers numerous advantages to lower-activity persons with amputation. Improvements in functional mobility and safety were observed. Of the subjects, 89% preferred Kenevo over their previous knee. Higher-quality research is needed to confirm the conclusions reached in this observational study.

MILANA P. MILEUSNIC, PhD, ANDREAS HAHN, PhD, and SEBASTIAN REITER, MSc, are affiliated with Otto Bock Healthcare Products GmbH, Vienna, Austria.

Disclosure: All authors are employees of Otto Bock Healthcare Products, the manufacturer of Kenevo Prosthetic Knee.

Correspondence to: Milana Mileusnic, PhD, Otto Bock Healthcare Products GmbH, Brehmstrasse 16, 1110 Vienna, Austria; email:

© 2017 by the American Academy of Orthotists and Prosthetists.