Article

Microprocessor controlled prosthetic knees (MPK) offer opportunities
for improved walking stability and function, but some devices' swing phase
features may exceed needs of users with invariable cadence. One MPK offers
computerized control of only stance (C-Leg Compact). OBJECTIVE: To assess
Medicare Functional Classification Level K2 walkers' ramp negotiation
performance, function and balance while using a non-MPK (NMPK) compared to the
C-Leg Compact. STUDY DESIGN: Crossover. METHODS: Gait while ascending and
descending a ramp (stride characteristics, kinematics, electromyography) and
function were assessed in participant's existing NMPK and again in the C-Leg
Compact following accommodation. RESULTS: Ramp ascent and descent were markedly
faster in the C-Leg Compact compared to the NMPK (p </= 0.006), owing to
increases in stride length (p </= 0.020) and cadence (p </= 0.020). Residual limb
peak knee flexion and ankle dorsiflexion were significantly greater (12.9 degrees
and 4.9 degrees more, respectively) during single limb support while using the
C-Leg Compact to descend ramps. Electromyography (mean, peak) did not differ
significantly between prosthesis. Function improved in the C-Leg Compact as
evidenced by a significantly faster Timed Up and Go and higher functional questionnaire scores. CONCLUSIONS: Transfemoral K2 walkers exhibited
significantly improved function and balance while using the stance-phase only MPK
compared to their traditional NMPK.

Langue : ANGLAIS