A knee prosthesis for an artificial leg which comprises a top hinge member (1) and a lower hinge member (2) interconnected by link means (3),the top hinge member incorporating a brake member (6) with a convex face (27) which under download in or adjacent to an unflexed state of the knee acts against a seat (7) on the lower hinge member (2) to provide frictional resistance to flexing of the knee. Resilient biasing means (10) may be provided on the lower hinge member (2) to disengage the brake member (6) from its seat (7) in the absence of a download.
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