limb amputees Prosthetic knee joint

The type of knee used on an above knee prosthesis depends on the patient’s activity level, the patient’s weight, the patient’s strength and ability to control the knee, residual limb length, funding, and patient preference.

Friction is used in the knees in order to control the knee joint during walking. Friction controls how far and how fast the knee bends and straightens during gait. Some knees have mechanical friction while others have hydraulic resistance. Computerized knees are also available that control the knee speed based on the person’s gait. Mechanical knees provide constant friction where the hydraulic knees and computerized knees change the knee speed depending on how fast the person is walking.

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