Table 4.

Reason for Revision, Stratified by Morbidly Obese, Obese, and Not Obese

Factor	Not Obese (n = 465,968)	Obese (n = 70,953)	Morbidly Obese (n = 68,682)	P
Infection	114,719 (24.62%)	17,877 (25.20%)	21,171 (30.82%)	<0.0001
Mechanical loosening	91,987 (19.74%)	15,072 (21.24%)	14,062 (20.47%)	0.0003
Other mechanical problems	69,630 (14.94%)	11,058 (15.58%)	10,148 (14.78%)	0.1538
Implant failure	24,765 (5.32%)	3,084 (4.35%)	2,392 (3.48%)	<0.0001
Dislocation/instability	35,731 (7.67%)	6,321 (8.91%)	6,184 (9.00%)	<0.0001
Other mechanical complications	17,148 (3.68%)	2,643 (3.73%)	1,750 (2.55%)	<0.0001
Bearing surface wear	17,341 (3.72%)	2,379 (3.35%)	1,805 (2.63%)	<0.0001
Periprosthetic osteolysis	12,483 (2.68%)	1,845 (2.60%)	1,268 (1.85%)	<0.0001
Periprosthetic fracture	7,388 (1.59%)	937 (1.32%)	1,063 (1.55%)	0.0622