Table 2. Kaplan-Meier estimates of cumulative revision of the first revision (2nd prosthetic knee).
| Time since first revision | ||||||||
|---|---|---|---|---|---|---|---|---|
| Age group (years) | N (%) | 1 year | 3 years | 5 years | 7 years | 10 years | 13 years | 15 years |
| All cases | 33,292 (100%) | 3·59 (3·39-3·80) | 9·51 (9·17-9·87) | l2·64 (12·22-13·07) | l4·82 (14·33-15·32) | 17·11 (16·47-17·77) | 1986 (18-34-21-47) | ·· |
| All females | 18,212 (54·7%) | 3·01 (2·76-3·27) | 7·89 (7·47-8·34) | 10·92 (10·38-11·47) | 12·70 (12·09-13·35) | 14·75 (13·94-15·60) | 16·62 (14·92-18·49) | 17-60 (15-16-20-37) |
| Female (<55) | 3,456 (10·4%) | 3·04 (2·51-3·69) | 8·64 (7·65-9·74) | 13·91 (12·54-15·41) | 17·07 (15·42-18·87) | 20·96 (18·65-23·51) | 24-55 (18-14-32-73) | ·· |
| Female (55-59) | 2,773 (8·3%) | 2·71 (2·15-3·41) | 8·97 (7·85-10·23) | 12·18 (10·81-13·72) | 15·40 (13·70-17·29) | 18·34 (16·06-20·90) | 18-77 (16-37-21-47) | ·· |
| Female (60-64) | 3,180 (9·6%) | 2·55 (2·05-3·18) | 7·84 (6·87-8·95) | 10·65 (9·44-12·00) | 12·30 (10·93-13·83) | 13·56 (11·94-15·39) | 16-63 (13-16-20-91) | 16-63 (13-16-20-91) |
| Female (65-69) | 3,203 (9·6%) | 3·64 (3·02-4·37) | 8·40 (7·40-9·53) | 11·41 (10·17-12·78) | 12·55 (11·19-14·06) | 14·57 (12·81-16·54) | 15-22 (13-12-17-62) | ·· |
| Female (70-74) | 2,650 (8·0%) | 2·71 (2·14-3·42) | 6·71 (5·74-7·84) | 8·71 (7·54-10·06) | 9·47 (8·19-10·93) | 10·56 (9·02-12·35) | 12-39 (9-02-16-90) | ·· |
| Female (75-79) | 1,853 (5·6%) | 3·21 (2·48-4·15) | 5·67 (4·63-6·93) | 7·15 (5·91-8·65) | 7·66 (6·31-9·29) | 8·31 (6·75-10·22) | 8-31 (6-75-10-22) | ·· |
| Female (80+) | 1,097 (3·3%) | 3·47 (2·50-4·80) | 7·91 (6·28-9·95) | 8·29 (6·59-10·40) | 8·29 (6·59-10·40) | 8·29 (6·59-10·40) | ·· | ·· |
| All males | 15,080 (45·3%) | 4·30 (3·97-4·64) | 11·47 (10·92-12·05) | 14·72 (14·07-15·41) | 17·36 (16·59-18·17) | 19·96 (18·96-21·01) | 23-60 (21-15-26-29) | ·· |
| Male (<55) | 2,611 (7·8%) | 5·04 (4·24-5·98) | 15·03 (13·58-16·63) | 19·02 (17·31-20·87) | 23·07 (21·01-25·31) | 26·62 (23·94-29·54) | 28-84 (24-88-33-28) | ·· |
| Male (55-59) | 2,342 (7·0%) | 3·49 (2·80-4·34) | 11·83 (10·45-13·37) | 16·00 (14·32-17·84) | 18·35 (16·45-20·44) | 22·22 (19·64-25·09) | 26-77 (22-26-31-99) | ·· |
| Male (60-64) | 3,038 (9·1%) | 4·44 (3·74-5·26) | 11·51 (10·32-12·82) | 15·07 (13·65-16·62) | 18·30 (16·60-20·16) | 19·96 (17·99-22·12) | 20-65 (18-32-23-23) | ·· |
| Male (65-69) | 2,869 (8·6%) | 4·12 (3·43-4·94) | 11·10 (9·89-12·46) | 13·64 (12·23-15·20) | 15·39 (13·80-17·15) | 18·09 (15·96-20·47) | 24-83 (18-28-33-21) | ·· |
| Male (70-74) | 2,239 (6·7%) | 4·72 (3·90-5·72) | 10·60 (9·29-12·08) | 13·48 (11·93-15·21) | 15·84 (14·00-17·90) | 17·45 (15·18-20·02) | 17-45 (15-18-20-02) | ·· |
| Male (75-79) | 1,330 (4·0%) | 3·61 (2·70-4·80) | 7·79 (6·36-9·53) | 10·15 (8·35-12·31) | 11·86 (9·75-14·39) | 13·63 (10·58-17·47) | 19-80 (10-55-35-38) | ·· |
| Male (80+) | 651 (2·0%) | 4·24 (2·91-6·17) | 7·48(5·53-l0·08) | 8·60 (6-37-11-55) | 9·44 (684-1297) | 10-76 (7·44-15·42) | 10-76 (7·44-15·42) | ·· |
Percentages calculated as a percentage of all cases. Blue italics signify that fewer than 250 cases remained at risk at these time points.