| 摘要 |
PROBLEM TO BE SOLVED: To obtain a prosthetic joint that can be bended greatly by providing the first to third prosthetic members and forming a primary load bowed portion in a state of constantly maintaining nearly the same contact composition over the range of a moving joint expanding on the third bearing face and within a specified bending angle range. SOLUTION: A femur member 200 is furnished with an outside bearing face made up of two condyles 204 and 206, and a web 208 connecting the condyles 204 and 206. The outside bearing face 202 is formed by the rotation of a plane curve 'X' around three axes indicated by points M1 to M3. The shape of the plane curve 'X' is formed by a curve having three radiuses around separate positions. In addition, the first to third bowed portions S1 to S3 are formed by the rotation of the plane curve 'X' around the axes M1 to M3 with radiuses W1 to W3 at an angle ofθ1 toθ3, and the length of the bowed portion S3 is an inverse function of the length of the bowed portion S2.
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