초록 ▼

A bone plate includes at least one torsional modification feature (TMF). Each TMF is structured to decrease the torsional rigidity of the plate relative to longitudinally opposite portions, but may be modified to increase the torsional rigidity thereat. Each TMF is defined by beams contiguous with t

A bone plate includes at least one torsional modification feature (TMF). Each TMF is structured to decrease the torsional rigidity of the plate relative to longitudinally opposite portions, but may be modified to increase the torsional rigidity thereat. Each TMF is defined by beams contiguous with the lateral sides of the plate, and an opening extending laterally therebetween. In a preferred embodiment, opposed projections extend into the opening to define threaded discontinuous wall portions for receiving an insert, such as a set screw. In one embodiment, bioabsorbable and/or bioactive inserts may be used to temporarily increase the torsional rigidity of the plate during initial fixation and thereafter have reduced torsional rigidity to mimic normal callus. The plate is preferably used with fixed angle fasteners that may be subject to high torsional loads post-operatively.

대표청구항 ▼

What is claimed is: 1. A bone plate for use with a least one cortical bone screw, comprising:an elongate bone plate having a longitudinal center, opposite first and second ends, and opposing lateral sides, said plate includinga screw hole located between said center and said first end, anda torsiona

What is claimed is: 1. A bone plate for use with a least one cortical bone screw, comprising:an elongate bone plate having a longitudinal center, opposite first and second ends, and opposing lateral sides, said plate includinga screw hole located between said center and said first end, anda torsional modification feature (TMF) located between said center and said screw hole, said TMF decreasing the torsional rigidity of the plate relative to two portions of the plate adjacent said TMF on longitudinally opposite sides of the TMF, said TMF comprising a first projection and a second projection, each of said projections contiguous with one of said two portions and lateral sides of said plate and an opening therebetween, said first projection including a first thread portion and said second projection including a second thread portion extending into the opening, said first and second thread portions forming discontinuous wall portions of a full thread; andmeans for coupling a cortical bone screw to said plate in a fixed axial orientation.