Patent attributes
A prosthesis whose condyles (3) have a spiral form, viewed in the saggital plane and the femoral element (1) has a medial lobe (6) with a curved surface. The medial plateau (2) has glenoid cavities (2b) for the condyles (3) and a medial prominence (5) which forms a posterior support surface (5a) against which the lobe (6) is supported in the course of movement of the joint. The glenoid cavities (2b) on the medial plateau (2) and the condyles (3) are congruent in extension and in the first part of the flexion movement of the joint. The posterior sections of the condyles (3) and the medial lobe (6) inscribe circles with the same centres and the medial lobe (6) contacts against the posterior support surface (5a) at the end of the first part of movement and then rests against the posterior support surface (5a) to perform a “roll-back”.
