A cutting block assembly comprising first and second interlocking blocks for resecting a distal femur. The first block has a first surface for providing a guiding surface for making an anterior chamfer cut on the femur and a second surface for providing a guiding surface for making a posterior chamfer...http://www.google.es/patents/US8016833?utm_source=gb-gplus-sharePatente US8016833 - Femoral cutting block