Prosthesis shank, esp. for total hip prosthesis

摘要

The shank has a metaphysis section (1b) having a cross-sectional shape formed by a lateral displacement of the centres (1h) of each of the radii forming its rounded inner surface (1f) relative to the mid-point (P) of the diaphysis aces (X-X'; Y-Y'). The posterior (1d) and anterior (1e) faces of the same section are set at different angles relative to axis (X-X'), the angles being constant for the whole height of the shank and between 7 and 15 degrees.The extension of the posterior face of the shank's metaphysis section is in the form of a portion of a cylinder having a radius of curvature of 2000 mm +/- 500 mm. The extension of the anterior face forms a portion of a cylinder with a radius of curvature of 240 nm +/- 40 mm. In addition, the anterior and posterior faces of the shank have droplet-shaped recesses to create a resistance to movement and to allow for osteogenesis