Femoral fixation

1 . A graft fixation device for fixing a graft member within a bone tunnel, the device comprising:

a radially expandable sheath having proximal and distal ends and a central lumen extending therebetween, the radially expandable sheath having at least first, second, and third sidewalls, the first sidewall having an entirely convex outer surface and a stop member formed on a proximal-most end thereof, the stop member having a distal-facing surface that is distal to at least a portion of a proximal-most end of the second sidewall, and the stop member being configured to prevent over-insertion of the radially expandable sheath into a bone tunnel; and

a sheath expander disposable within the central lumen of the radially expandable sheath and configured to flex the sidewalls to radially expand the sheath so as to fix a graft member extending along the sidewalls within the bone tunnel;

wherein a distal-most end of the radially expandable sheath includes a lumen extending longitudinally therethrough for receiving a guide wire;

wherein the sidewalls are at least partially separated by longitudinally oriented slots extending therebetween;

wherein the sidewalls are each connected by a proximal attachment point and a distal attachment point, and wherein the slots extend between the proximal and distal attachment points.

2 . A graft fixation device for fixing a graft member within a bone tunnel, the device comprising:

a radially expandable sheath having proximal and distal ends and a central lumen extending therebetween, the radially expandable sheath having at least first, second, and third sidewalls, the first sidewall having an entirely convex outer surface and a stop member formed on a proximal-most end thereof, the stop member having a distal-facing surface that is distal to at least a portion of a proximal-most end of the second sidewall, and the stop member being configured to prevent over-insertion of the radially expandable sheath into a bone tunnel; and

a sheath expander disposable within the central lumen of the radially expandable sheath and configured to flex the sidewalls to radially expand the sheath so as to fix a graft member extending along the sidewalls within the bone tunnel;

wherein a distal-most end of the radially expandable sheath includes a lumen extending longitudinally therethrough for receiving a guide wire;

Wherein at least one of the second and third sidewalls has a substantially concave outer surface configured to seat a graft member;

wherein the entirely convex outer surface of the first sidewall is adapted to engage the bone tunnel; and

further comprising first surface features formed on the concave outer surface, the first surface features being adapted to engage the graft member, and second surface features formed on the entirely convex outer surface, the second surface features being adapted to engage bone within the bone tunnel.

3 . The graft fixation device of claim 2 , wherein the first and second surface features extend in a radial direction.

4 . A graft fixation device for fixing a graft member within a bone tunnel, the device comprising:

a radially expandable sheath having proximal and distal ends and a central lumen extending therebetween, the radially expandable sheath having a plurality of sidewalls, at least one of the sidewalls having a stop member formed on a proximal-most end thereof, the stop member being configured to prevent over-insertion of the radially expandable sheath into a bone tunnel, and at least one of the sidewalls having an axial rib centrally disposed thereon, the rib being equidistant from opposing outer edges of the at least one sidewall and configured to minimize rotational movement of the radially expandable sheath; and

a sheath expander disposable within the central lumen of the radially expandable sheath and configured to flex the plurality of sidewalls to radially expand the sheath so as to fix a graft member extending along the plurality of sidewalls within the bone tunnel,

wherein the sheath expander and the radially expandable sheath are formed from a bioabsorbable material.

5 . The graft fixation device of claim 4 , wherein the plurality of sidewalls are at least partially separated from each other by longitudinally oriented slots extending therebetween.

6 . The graft fixation device of claim 4 , wherein at least one of the plurality of sidewalls has a substantially concave outer surface configured to seat a graft member, and at least another of the plurality of sidewalls has a substantially convex outer surface adapted to engage the bone tunnel.

7 . The graft fixation device of claim 6 , wherein the concave outer surface has first surface features formed thereon and configured to engage the graft member, and the convex outer surface has second surface features formed thereon and configured to engage bone within the bone tunnel.

8 . The graft fixation device of claim 4 , wherein a proximal-most end of the radially expandable sheath is angled relative to a longitudinal axis of the radially expandable sheath.

9 . The graft fixation device of claim 4 , wherein a distal-most end of the radially expandable sheath includes a lumen extending longitudinally therethrough for receiving a guide wire.

10 . The graft fixation device of claim 4 , wherein the sheath expander has a maximum outer diameter that is greater than a maximum inner diameter of the radially expandable sheath in an unexpanded state.