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Overview of Prosthetic Knees

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Generic Class Knee
Basic Function
Primary Indication
Major Advantages
Chief Limitations
Single axis (constant friction)   Simplicity   show Inexpensive, durable   Fixed cadence, low stability  
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show Increased weight-bearing stability   General weakness or infirmity; poor hip control   Improved knee stability   Delayed swing phase; must unload fully to flex or sit  
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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   show
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Manual lock   show Ultimate knee stability   Eliminates knee flexion   Abnormal gait; awkward sitting  
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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   show
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Created by: npoliti
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