| 摘要 |
The invention relates to an artificial hip joint in which a length of fit can be ensured without increasing the overall height of the head, and stress generated in the head can be alleviated by avoiding concentration of stress. An artificial hip joint includes a stem (6) having a neck portion (5) which has a truncated conical outer circumferential surface (4) decreased in diameter toward a tip (3) thereof; a head (8) provided with a concavity (7) in which the neck portion (5) is inserted, an inner surface of the concavity (7) of the head including a truncated conical inner circumferential surface (10) decreased in diameter toward an insertion direction of inserting the neck portion (5); and a sleeve (2A) inserted between the outer circumferential surface (4) of the neck portion (5) inserted into the concavity (7) and the inner circumferential surface (10) of the head (8). The sleeve (2A) has an inner circumferential portion (13) which makes contact with the outer circumferential surface (4) of the neck portion (5), and an outer circumferential portion (16) which makes contact with the inner circumferential surface (10) of the head (8), a starting end of the outer circumferential portion being located at a position retracting from an opening portion (14) of the concavity (7) in the insertion direction A. |
