Article

OBJECTIVE: To investigate the effect of the 3R90 and 3R92 (Otto Bock Healthcare)
mechanical passive prosthetic knee devices on the physical function, gait, and
dynamic balance (sudden stop and turn) of transfemoral amputees. DESIGN:
Intervention study with crossover design. SETTING: University research center.
PARTICIPANTS: Men (N=5; mean age +/- SD, 58.8+/-11.9y) with unilateral
transfemoral amputation. INTERVENTION: Prosthetic knee joints (N=2; 3R90 and
3R92). Acclimatization ranged from 14 to 47 days (25.5+/-9.3d). MAIN OUTCOME
MEASURES: Physical function, gait, dynamic balance. RESULTS: The Timed Up and Go
Test, 6-Minute Walk Test, and Four Square Step Test measures improved with the
3R92. Total scores on the Prosthesis Evaluation Questionnaire were similar for
the 3R92 (82.0+/-6.3) and the participant's own or original device (83.9+/-4.8).
These devices were rated higher than the 3R90 (65.5+/-16.8). Compared with the
original device, gait velocity was significantly slower (5cm/s; P=.017) with the
3R92, but was unchanged for the 3R90. This difference was not considered
clinically significant because the effect size was small (0.2). No other
significant gait differences were found. Large temporal gait asymmetries observed
with the original device remained with the 3R90 and 3R92 (step, approximately
20%; single support, approximately 30%; stance, approximately 19%). Although no
significant differences were found for the sudden-turn or sudden-stop tasks, the
sudden-turn group success rates were highest with the original devices.
CONCLUSIONS: Gait and symmetry measures were unchanged. Gait speed was slower
with the 3R92, but this was not considered to be clinically significant.
Sudden-turn success rates generally were higher with the original devices. A
crossover stepping movement was more difficult to implement than a side-stepping
movement during sudden turns.
CI - Copyright (c) 2010 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

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