Knotless bioabsorbable suture anchor system and method

A system for anchoring tissue to bone, comprising:

• an expandable base member having a distal end and a proximal end, the proximal end having a bore extending longitudinally therein and at least part of the proximal end being selectively radially expandable;
• a first loop of suture thread attached to the base member;
• a second loop of suture thread interlocked with the first loop of suture thread;
• a suture needle having a first, tissue penetrating end and a second, trailing end, wherein the suture needle is attached to the second loop of suture thread;
• and
• an expander pin, selectively disposable within the bore of the base member to radially expand the base member from a first outer diameter to a second outer diameter.

A suture anchor, comprising:

• a first component including a tip having a suture thread-engaging groove formed therein, and a through-hole extending through the tip in a direction transverse to a longitudinal axis of the suture anchor;
• a second component having an external surface with at least one positive surface feature formed thereon, at least a portion of the second component being selectively radially expandable;
• and
• a bore extending into the second component of the suture anchor from the proximal end thereof, the bore being parallel with the longitudinal axis of the suture anchor.