The benefits of the Direct Anterior Approach in Hip Resurfacing is avoidance of detaching major muscle groups from bone, higher likely hood to maintain the blood supply to the remaining femoral neck, less likely to dislocate as the dynamic hip stabilizer (short external rotators) are completely unaffected (posterior approach releases all the dynamic stabilizer of the hip), and less likely to limp since the abductor are not released from the greater trochanter (as in the anterior lateral approach).
The main disadvantage of the DAA is that it is more difficult for the surgeon, not all patients are candidates and we do not have long-term follow-up data. In the short term it appears that the DAA has a shorter recovery phase, a shorter hospital stay, improved component position and improved early function. I do want to emphasize that we do not have enough data to make these claims but our data appears to have a trend it this direction.
