K-level | Description | Foot/ankle components | Knee components |
K0 | Patient does not have the ability or potential to ambulate or transfer safely without assistance, and a prosthesis does not enhance their quality of life or mobility. | Not eligible | Not eligible |
K1 | Patient has ability or potential to use prosthesis for transfers or ambulation on level surfaces at fixed cadence - a typical limited or unlimited household ambulator. | External keel, SACH feet, or single-axis ankle/feet | Single-axis, constant-friction knee |
K2 | Patient has the ability or potential for ambulation with the ability to traverse low-level environmental barriers, such as curbs, stairs, or uneven surfaces - a typical community ambulator. | Flexible-keel feet and multi-axial ankle/feet | Single-axis, constant-friction knee |
K3 | Patient has the ability or potential for ambulation with variable cadence - a typical community ambulator with the ability to traverse most environmental barriers and may have vocational, therapeutic, or exercise activity that demands prosthetic use beyond simple locomotion. | Flex-foot and flex-walk systems, energy-storing feet, multi-axial ankle/feet or dynamic response feet | Fluid and pneumatic control knees |
K4 | Patient has the ability or potential for prosthetic ambulation that exceeds basic ambulation skills, exhibiting high impact, stress, or energy levels - typical of the prosthetic demands of a child, active adult, or athlete. | Any ankle/foot system | Any knee system |
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