Table 5.

Causes of revision for the 4 major prosthesis types

	HP n = 2,447	ATP n = 444	RP n = 454	RTP n = 828
Loosening glenoid	-	6	-	24
Loosening humerus	14	1	7	12
Dislocation	19	11	2	19
Instability	18	3	5	6
Deep infection	12	1	3	11
Pain	81	7	43	4
Other a	39	3	14	7
Total b	147	29	57	67

For abbreviations, see Table 1.

^aIncluding worn polyethylene insert, periprosthetic fractures, axis deviation, dysfunction, and other.

^bTotal number of revisions within each prosthesis group. More than one cause of revision could be registered for each patient, giving a sum of all causes that was greater than the total number of revision operations.