What are the different kinds of knees?
1. Constant friction knee: single walking speed, can be used in kids, inexpensive and reliable.
2. Stance control knee: single axis with stance control, used in geriatrics, short residual limb, general disability, weak hip extensors. Can't be used in B/L AKA because can't bend both knees. Can't do step over step stair descent.
3. Polycentric/4-bar knee: inherently stable, short knee use, improved cosmesis.
4. Manual locking knee: automatically locks if standing, good stability, awkward gait and sitting.
5. Fluid-controlled knee units: hydraulic or pneumatic, allows for either swing phase or swing and stance phase control. For active walkers, gives smoothest gait. Greatest cost and maintenance.
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