| 摘要 |
According to the invention, a plate, especially for the upper arm, has guides for preferably two screws which steadily holds the screws such that they are at an angle relative to said plate. In addition, the screws are preferably fixed to a fixing device such that they can be detached and are prevented from turning in the screw shaft and displacing in a direction of the screw shaft. To this end, a special screw is provided which has an outer thread diameter that is larger than the adjacent shaft diameter. The shaft diameter increases in the area of the screw head in order to guarantee a sure guiding.
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