An acrylic radiopaque bone cement for orthopedic use comprises a solid phase composed of a mixture of at least one poly-based polymer, one free-radical polymerization initiator and one or more substances opaque to X-rays, and a liquid phase substantially composed of a mixture of at least one monomer, one accelerator and one stabilizer. The gutter includes an upstream recess linked with the secondary flow, and the screen includes, on its upstream section, at least one ventilation orifice of the space situated between the screen and the manifold. The implant can comprise a plurality of loose, bulked fibers.