| 摘要 |
A fixation system ( 10 ) includes a device having a nail portion ( 12 ) and a plate portion ( 14 ), preferably horizontally and vertically offset relative to the nail portion by a neck portion ( 16 ). The nail portion ( 12 ) includes preferably threaded screw holes ( 24, 26 ), and the plate portion ( 14 ) includes longitudinally displaced peg holes ( 50, 52, 54 ), each of which is adapted to orient a peg ( 56, 58, 60 ) in a different orientation from the others. The system ( 10 ) also includes unicortical screws ( 28 ) having a reasonably large head ( 36 ) adapted to seat against the outer surface of the bone and a threaded shaft ( 32 ) adapted to engage in the screw holes ( 24, 26 ), and pegs ( 56, 58, 60 ) adapted to engage in the peg holes ( 50, 52, 54 ). Where threaded screw holes ( 24, 26 ) are used, bone is clamped between the nail portion ( 12 ) and the head ( 36 ) of the unicortical screws ( 28, 30 ). The pegs ( 56, 58, 60 ) provide stabilization and support for subchondral fragments. Moreover, as the pegs ( 56, 58, 60 ) preferably enter the subchondral fragments from a plurality of directions, additional fixation of the device ( 10 ) into the bone is provided.
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