- RPM’s unique circular macroporous design allows for direct contact between the bone graft and periosteum, allowing naturally occurring revascularization and infiltration of cells into the bone graft.RPM is designed to work like traditional titanium mesh, but with the added benefits of easier trimming and easier adaptation. The hole patterns on each configuration are designed to make removal easier. RPM should only be used when primary closure can be achieved and maintained throughout the entire healing period.