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Prosthetic Knees

Overview of Prosthetic Knees

Generic Class KneeBasic FunctionPrimary IndicationMajor AdvantagesChief Limitations
Single axis (constant friction) Simplicity Single speed walking, only if hip control is "good" or better, or when duability is required Inexpensive, durable Fixed cadence, low stability
Stance control (weight activated locking) Increased weight-bearing stability General weakness or infirmity; poor hip control Improved knee stability Delayed swing phase; must unload fully to flex or sit
Polycentric Positive stability and ease of flexion for swing phase; special design available that provides sitting cosmesis for long residual limbs To enhance knee stability; special design availabe for knee disartic Stable without disrupting swing phase; sitting cosmesis Increased weight, maintenance, cost
Manual lock Knee of last resort Ultimate knee stability Eliminates knee flexion Abnormal gait; awkward sitting
Fluid-controlled Permits cadence change; micro-processor control offers most normal gait pattern Able to vary walking speed Variable cadence; more natural gait; hydraulic stance control adds stability Increased cost; possible weight or maintenance increase
Created by: npoliti