The fixing member ( 1 ) , the proximal anchor base ( 2 ) including an outer peripheral proximal wall defining the inner boundary of the cavity ( 5 ) , and the proximal near to include a distal joint part ( 7 ) which is received within the cavity position includes a stud ( 3 ) , said proximal wall ( 5) , the outer periphery includes a proximal rim ( 6 ) , said distal joint part ( 7 ) is to ensure that are held in the proximal cavity . In accordance with the present invention , the distal joint part ( 7 ) has an outer periphery that is dimensioned to close the inner surface of the proximal wall ( 5 ) has a convex distal surface ( 9 ) , the vertex is substantially located on the axis of the proximal stud ( 3 ) a fixed member ( 1 ) has a curved shape , said proximal elastically deformable element disposed on the bottom of the cavity ( 10 includes ) , the vertex is substantially located on the axis of the proximal cavity surface ( 9 ) abuts on the element ( 10 ) , elements ( 10 ) , said rim and said portion ( 7 ) continuously permanently I elastically deformed so as to press against ( 6 ) . [ Selection Figure ] Figure 8固定部材(1)は、近位キャビティの内部の境界を定める外周近位壁(5)を含む固定基部(2)、及び上記近位キャビティ内に受け入れられる遠位関節部分(7)を含む近位スタッド(3)を含み、上記近位壁(5)は、外周近位リム(6)を含み、上記遠位関節部分(7)が上記近位キャビティ内に保持されることを確実にする。本発明によると、遠位関節部分(7)は、上記近位壁(5)の内面に近接するように寸法決めされる外周縁を有し、凸状の遠位面(9)を有し、その頂点は近位スタッド(3)の軸上に実質的に位置し;固定部材(1)は、湾曲した形状を有する、上記近位キャビティの底部に配置される弾性変形可能な要素(10)を含み、その頂点は、上記近位キャビティの軸上に実質的に位置し、面(9)はこの要素(10)に当接し、要素(10)は、上記部分(7)を上記リム(6)に対して連続的に押圧するように恒久的に弾性変形する。【選択図】図8
