【摘要】The utility model discloses a joint prosthesis, include: body part, deformable portion, body part and deformable portion fixed connection, the body part is located main key upper end including emulation joint and main backbone, emulation joint, main backbone is that main backbone is equipped with outside convex connector with the mode fretwork that runs through from top to bottom, be equipped with the check valve in the main backbone, and the check valve is located the below of connector, the opening part of connector is equipped with internal thread or external screw thread, deformable portion is equipped with the column jacket with main key intercommunication, column jacket upper end opening, the lower extreme seals. The utility model provides a joint prosthesis, deformable portion inserts the pulp cavity and need not to expand the marrow with the form of compression diameter, or only needs the limited marrow that expands of near -end for operation technique is convenient.
