Table 5 Results of multivariate analysis of cup failure
From: Factors affecting aseptic loosening of 4750 total hip arthroplasties: multivariate survival analysis
| Â | Failures/I Implants | Unadjusted (95% CI) | Adjusted for all variables (95% CI) | P |
|---|---|---|---|---|
Gender | Â | Â | Â | Â |
Female | 82/2951 | 1 (referent) | 1(referent) | Â |
Male | 52/1799 | 1.12 (0.79–1.58) | 0.76 (0.53–1.10) | p = 0.16 |
Side | Â | Â | Â | Â |
Left | 60/2204 | 1 (referent) | 1 (referent) | Â |
Right | 74/2546 | 1.08 (0.77–1.52) | 1.16(0.82–1.63) | p = 0.34 |
Age at surgery | Â | Â | Â | P --trend= 0.005 |
Between 40 and 69 | 86/2965 | 1 (referent) | 1 (referent) | Â |
Higher than 70 | 27/1377 | 0.75 (0.49–1.16) | 0.66 (0.41–1.08) | p = 0.098 |
Lower than 40 | 21/408 | 1.99 (1.24–3.21) | 2.02 (1.21–3.38) | p = 0.007 |
Charnley's hip score | Â | Â | Â | Â |
Class A | 78/3027 | 1 (referent) | 1(referent) | Â |
Class B+C | 56/1723 | 1.12 (0.79–1.57) | 1.15 (0.81–1.63) | p = 0.42 |
Skills of surgeon | Â | Â | Â | Â |
More than 400 operations | 63/2604 | 1 (referent) | 1 (referent) | Â |
Less than 400 operations | 71/2146 | 1.46 (1.04–2.05) | 1.23 (0.85–1.77) | p = 0.27 |
Type of cup | Â | Â | Â | P --trend= 0.004 |
Press fit, ceramic or metal liner | 50/2249 | 1 (referent) | 1 (referent) | Â |
Cemented all polyethylene | 23/563 | 1.84 (1.12–3.01) | 2.68 (1.48–4.83) | p = 0.001 |
Press fit, polyethylene liner | 61/1938 | 1.42 (0.98–2.06) | 1.53 (1.02–2.29) | p = 0.04 |
Diagnosis in primary arthroplasty | Â | Â | Â | P --trend= 0.0001 |
Primary arthritis | 51/2667 | 1 (referent) | 1 (referent) | Â |
Sequelae of congenital and pediatric diseases | 44/865 | 2.44 (1.63–3.65) | 2.32 (1.49–3.62) | p = 0.0001 |
Femoral neck fracture and sequelae | 29/681 | 2.41 (1.53–3.80) | 1.98 (1.24–3.17) | p = 0.004 |
Other | 10/537 | 0.99 (0.50–1.95) | 0.46 (0.38–1.55) | p = 0.46 |