FIELD: medical engineering. SUBSTANCE: device has stem part introduceable into the femur and saddle-shaped part attached to the stem part. The saddle-shaped part is ratably attached to the stem part with at least two degrees of freedom and containing saddle recess with bearing surface for a part of haunch bone. The saddle-shaped part is designed so that rotation is allowed at least about one rotation or rolling movement axis passing above the bearing surface of the saddle-shaped part. EFFECT: prevented instability of the saddle-shaped part; prevented disconnection of prosthesis parts. 41 cl, 6 dwg
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