Table 4.

Characteristics of 37 revisions directly related to ceramic use

Reasons	Bearing type and diameter of bearing and cup being revised
Ceramic head rupture* (n = 8)	6 Al/Al: 3 in 28 mm (cup diameters were 48 mm, 56 mm, and 60 mm), 2 in 32 mm (cup diameters were 54 mm and NA), 1 in 36 mm (cup was 60 mm) 2 Delta/Delta: 1 in 32 mm (cup was 58 mm), 1 in 36 mm (cup was 60 mm)
Insert rupture* (n = 4)	2 Al/Al: one in 32 mm (cup 50 mm) and one in 36 mm (cup 56 mm) 2 Delta/Delta: one in 28 mm (cup 52 mm) and one in 36 mm (cup 52 mm)
Ceramic sandwich fracture (n = 11)	Al/Al sandwich, all 28 mm
Squeaking (n = 6)	6 Al/Al (5 in 32 mm and 1 in 36 mm)
Prosthetic impingement (n = 7)	2 Al/Al 28 mm 1 Al/Al 32 mm 1 Delta/Delta 32 mm 3 Delta/Delta 36 mm
Incorrect insert introduction	1 Al/Al 32 mm

* Cup diameter indicated in cases of ceramic component breakage; Al/Al = alumina-on-alumina; NA = not available.