Clinical Study
Occult Infection in Aseptic Joint Loosening and the Diagnostic Role of Implant Sonication
Table 1
Comparison between the study groups (comparison by Chi-square test and ANOVA means comparison).
| Factor | Aseptic loosening = 54 | Control = 52 | value | Odds ratio |
| Male sex | 33 (61%) | 21 (40%) | 0.033 | | Mean age at index arthroplasty (yrs) | 57.4 | 60.4 | 0.274 | | Mean age at revision arthroplasty (yrs) | 72.3 | 70.7 | 0.452 | | Mean number of years since index operation (95% CI) | 14.0 (11.2–16.8) | 10.3 (8.1–12.5) | 0.054 | | Joint type | | | | | Hip | 37 (70%) | 40 (75%) | 0.51 | | Knee | 16 (30%) | 13 (25%) | | Cemented implants | 25 (46%) | 22 (42%) | 0.073 | | Smoking history | 7 (13%) | 1 (2%) | 0.007 | 7.6 | Indication for index replacement | | | | | Degenerative | 45 (83%) | 42 (81%) | 0.823 | | Inflammatory arthritis | 3 (6%) | 3 (6%) | | Posttraumatic arthritis | 4 (7%) | 3 (6%) | | Other | 2 (4%) | 4 (8%) | |
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