| 摘要 |
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 ( 2 b) for the condyles ( 3 ) and a medial prominence ( 5 ) which forms a posterior support surface ( 5 a) against which the lobe ( 6 ) is supported in the course of movement of the joint. The glenoid cavities ( 2 b) 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 ( 5 a) at the end of the first part of movement and then rests against the posterior support surface ( 5 a) to perform a "roll-back".
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