Prosthesis designs and their implantations. A (top): Two different designs of the Wagner revision stem. Left: 34 mm offset prosthesis (standard prosthesis). Centre: 44 mm offset prosthesis (increased offset prosthesis). Right: Superposition of the two stem designs, with the standard prosthesis shown as translucent. B (bottom): Variation of surgical implantation. Left: 44 mm offset stem implanted at 4° (transparent) and 14° of femoral anteversion, Right: 34 mm offset stem implanted at 4° (transparent) and 14° of femoral anteversion.