Table 1.
Summary of first revisions of known total conventional hip replacement (primary diagnosis osteoarthritis)
| Parameter | Loosening (n = 4018) | Prosthesis dislocation or instability (n = 3620) | Fracture (n = 3675) | Osteolysis (n = 364) | Other (n = 2036) | Total (n = 13,713) |
| Follow-up in years, primary to first revision | 4 (1.1-8.2) | 0.8 (0.1-3.9) | 3 (0.1-7.8) | 10 (6.9-13.3) | 3 (0.9-7) | 3 (0.3-7.3) |
| Follow-up in years, first revision to second revision | 4.3 (1.8- 8) | 3.9 (1.6, 7.6) | 3 (1.1- 5.9) | 4.6 (1.8, 7.5) | 4.1 (1.6- 7.4) | 3.8 (1.5-7.2) |
| Age at first revision in years | 70 ± 11 | 71 ± 11 | 76 ± 11 | 71 ± 10 | 66 ± 11 | 71 ± 11 |
| Age at first revision in years by group | ||||||
| < 55 | 8 (320) | 8 (277) | 3 (127) | 6 (21) | 16 (320) | 8 (1065) |
| 55-64 | 19 (771) | 17 (599) | 11 (390) | 16 (57) | 27 (555) | 17 (2372) |
| 65-74 | 35 (1409) | 33 (1179) | 25 (937) | 37 (135) | 35 (704) | 32 (4364) |
| ≥ 75 | 38 (1518) | 43 (1565) | 60 (2221) | 41 (151) | 22 (457) | 43 (5912) |
| Women | 51 (2055) | 61 (2213) | 53 (1951) | 52 (190) | 53 (1087) | 55 (7496) |
| ASA class at first revisiona | ||||||
| ASA 1 | 7 (154) | 4 (89) | 3 (73) | 6 (15) | 10 (130) | 5 (461) |
| ASA 2 | 47 (1089) | 42 (847) | 27 (688) | 46 (113) | 50 (682) | 40 (3419) |
| ASA 3 | 43 (996) | 51 (1027) | 57 (1445) | 46 (111) | 37 (503) | 48 (4082) |
| ASA 4 | 4 (88) | 4 (72) | 340 (13.3) | 2 (5) | 3 (44) | 6 (549) |
| ASA 5 | 0 (1) | 7 (0.3) | 0.1 (8) | |||
| BMI in kg/m2 at first revisionb | ||||||
| Underweight: < 18.5 | 0.7 (12) | 1.2 (18) | 2 (35) | 0.8 (8) | 1 (73) | |
| Normal: 18.5-24.9 | 19 (322) | 21 (309) | 30 (459) | 23 (42) | 17 (173) | 22 (1305) |
| Pre-obese: 25.0-29.9 | 37 (636) | 37 (549) | 34 (531) | 38 (70) | 39 (405) | 37 (2191) |
| Obese class 1: 30.0-34.9 | 27 (454) | 25 (369) | 20 (312) | 28 (52) | 25 (265) | 24 (1452) |
| Obese class 2: 35.0-39.9 | 11 (186) | 11 (157) | 8 (126) | 9 (17) | 13 (138) | 11 (624) |
| Obese class 3: ≥ 40.0 | 6 (94) | 5 (80) | 5 (79) | 2 (4) | 5 (53) | 5 (310) |
| Fixation of primary procedure | ||||||
| Cemented | 16 (662) | 8 (274) | 6 (224) | 6 (22) | 3 (54) | 9 (1236) |
| Cementless | 60 (2414) | 57 (2070) | 65 (2395) | 64 (233) | 77 (1562) | 63 (8674) |
| Hybrid | 23 (942) | 35 (1276) | 29 (1056) | 30 (109) | 21 (420) | 28 (3803) |
| Femoral fixation in first revision | ||||||
| Femoral cemented | 24 (959) | 8 (290) | 22 (798) | 14 (51) | 13 (260) | 17 (2358) |
| Femoral cementless | 36 (1452) | 6 (214) | 64 (2351) | 18 (65) | 20 (404) | 33 (4486) |
| No femoral component inserted in first revision | 40 (1607) | 86 (3116) | 14 (526) | 68 (248) | 67 (1372) | 50 (6869) |
| Acetabular fixation in first revision | ||||||
| Acetabular cemented | 9 (379) | 6 (231) | 3 (123) | 8 (30) | 4 (85) | 6 (848) |
| Acetabular cementless | 39 (1570) | 34 (1246) | 8 (297) | 44 (160) | 35 (710) | 29 (3983) |
| No acetabular component inserted in first revision | 51 (2069) | 59 (2143) | 89 (3255) | 48 (174) | 61 (1241) | 65 (8882) |
| Type of acetabular prosthesis in first revisionc | ||||||
| Constrained prosthesis | 3 (136) | 28 (965) | 3 (86) | 3 (12) | 2 (39) | 9 (1238) |
| Dual mobility prosthesis | 7 (287) | 17 (592) | 6 (217) | 8 (29) | 8 (166) | 10 (1291) |
| > 32 mm | 43 (1662) | 27 (940) | 39 (1295) | 34 (120) | 46 (918) | 38 (4935) |
| 32 mm | 33 (1268) | 19 (691) | 33 (1115) | 43 (155) | 32 (645) | 30 (3874) |
| < 32 mm | 14 (544) | 9 (326) | 19 (631) | 12 (42) | 11 (222) | 13 (1765) |
| Bearing surface of primary | ||||||
| Ceramic/ceramic | 21 (849) | 15 (549) | 24 (890) | 11 (39) | 41 (827) | 23 (3154) |
| Ceramic/non-XLPE | 5 (182) | 3 (105) | 3 (103) | 13 (49) | 3 (69) | 4 (508) |
| Ceramic/XLPE | 14 (557) | 17 (614) | 17 (611) | 5 (20) | 16 (324) | 16 (2126) |
| Metal/non-XLPE | 27 (1098) | 16 (566) | 11 (413) | 51 (185) | 11 (217) | 18 (2479) |
| Metal/XLPE | 29 (1182) | 43 (1553) | 40 (1466) | 14 (50) | 24 (497) | 35 (4748) |
| Ceramicized metal/non-XLPE | 0.4 (18) | 0.2 (9) | 0.1 (2) | 3 (10) | 0.5 (11) | 0.4 (50) |
| Ceramicized metal/XLPE | 3 (130) | 6 (222) | 5 (185) | 3 (10) | 4 (89) | 5 (636) |
| Unknown | 0 (2) | 0.1 (2) | 0.1 (5) | 0.3 (1) | 0.1 (2) | 0.1 (12) |
| Bearing surface of first revisiond | ||||||
| Ceramic/ceramic | 6 (161) | 2 (76) | 5 (49) | 5 (16) | 18 (251) | 7 (553) |
| Ceramic/non-XLPE | 2 (51) | 3 (97) | 3 (28) | 2 (7) | 3 (37) | 3 (220) |
| Ceramic/XLPE | 19 (512) | 15 (454) | 17 (163) | 20 (68) | 31 (437) | 19 (1634) |
| Metal/non-XLPE | 12 (327) | 27 (842) | 13 (132) | 8 (27) | 5 (73) | 16 (1401) |
| Metal/XLPE | 54 (1431) | 45 (1386) | 57 (565) | 54 (186) | 37 (529) | 48 (4097) |
| Ceramicized metal/non XLPE | 0.2 (4) | 1 (44) | 0.5 (5) | 0.6 (2) | 0.3 (4) | 0.7 (59) |
| Ceramicized metal/XLPE | 6 (155) | 6 (178) | 4 (41) | 10 (34) | 6 (88) | 6 (496) |
| Other bearing surface | 0.9 (25) | 1 (32) | 0.2 (2) | 2 (6) | 0.7 (10) | 0.9 (75) |
Data are presented as the median (IQR), mean ± SD, or % (n). Other bearing surface of first revision includes 59 metal-on-metal, 14 ceramic-on-metal, and two ceramicized metal-on-XLPE. The % is expressed when we have all known values; thus, there are some discrepancies with the actual totals (denominator).
a
Excludes 5194 procedures with unknown ASA class at first revision.
b
Excludes 7758 procedures with unknown BMI at first revision.
c
Excludes 610 procedures with unknown type of acetabular prosthesis in the first revision.
d
Excludes 5178 procedures with unknown bearing surface of first revision; ASA = American Society of Anesthesiologists; XLPE = crosslinked polyethylene.