| 摘要 |
An external fixator for positioning a first element relative to a second element. The external fixator includes a first base for mounting to the first element; a second base for mounting to the second element; a plurality of adjustable effective length struts; connector structure for rotatably attaching the first ends of a first pair of struts relative to one another and relative to the first base; connector structure for rotatably attaching the first ends of a second pair of struts relative to one another and relative to the first base; connector structure for rotatably attaching the first ends of a third pair of struts relative to one another and relative to the first base; connector structure for rotatably attaching the second ends of the first pair of struts relative to one another and relative to the second base; connector structure for rotatably attaching the second ends of the second pair of struts relative to one another and relative to the second base member; and connector structure for rotatably attaching the second ends of the third pair of struts relative to one another and relative to the second base member. A method of using an external fixation device to reposition a first bone segment relative to a second bone segment includes attaching said first base member to said first bone segment, attaching said second base member to said second bone segment, and adjusting the effective length of at least one of the struts. The effective length of the struts can be determined from a general deformity equation based on first effective diameter, second effective diameter, neutral strut length, anterior-posterior, lateral-medial and, axial displacements, anterior-posterior and lateral-medial angulations axial rotation, vertical distance from the first base member to the origin, and the amount the second bone segment is rotated about its axis from its correct position.
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