Table 4.

Reason for revision total hip arthroplasty

	Discharges (n = 400,974)
Dislocation/Instability	87,605 (21.85%)
Mechanical Loosening	79,156 (19.74%)
Other Mechanical Complications	69,684 (17.38%)
Infection	60,562 (15.10%)
Periprosthetic Osteolysis	27,668 (6.90%)
Periprosthetic Fracture	26,332 (6.57%)
Implant Failure	23,103 (5.76%)
Bearing Surface Wear	22,306 (5.56%)

Listed reason for patients undergoing rTHA collected from the NIS database of patients undergoing THA and rTHA from 2006 to the third quarter of 2015