artroprotesi perfected to plant facilitated, particularly for reconstruction, biomechanics of the joint coxofemorale.

摘要

Arthroprosthesis (1) with facilitated implantation, particularly for biomechanical reconstruction of the coxofemoral joint, comprising a femoral shank (2) and a spherical head (3) which is accommodated rotatably in an artificial cotyloid element (4) and is associated with the femoral shank (2) by way of a variable-geometry neck (5) which acts as a connection between the shank (2) and the spherical head (3), the neck (5) having an end portion (5a) inserted with mechanical interference in a slot (6) defined in the free end (2a) of the femoral shank (2) thus defining a conical coupling with the slot (6), the slot (6) being substantially frustum-shaped with an end portion (6a), defined at a distance (11) from the bottom (8) of the slot (6), that has a substantially cylindrical shape in order to prevent the end portion (5a) of the neck (5) from jamming or seizing with the walls of the slot (6) if the neck (5) sinks, the cylindrical end portion (6a) interrupting the conicity of the walls at a distance (11) from the bottom (8) of the slot (6), thus preventing sticking or jamming in the distal end of the slot (6) if the neck (5) sinks.