Table 1 Characteristics of the studied group. Patients are classified according variables that entered in subsequent multivariate analysis
From: Factors affecting aseptic loosening of 4750 total hip arthroplasties: multivariate survival analysis
| Â | Type of cup | ||
|---|---|---|---|
| Â | Cemented all polyethylene | Press fit, polyethylene liner | Press fit, ceramic or metal liner |
| Â | N. (%) | N. (%) | N. (%) |
Gender | Â | Â | Â |
   Male | 137 (24.3) | 765 (39.5) | 897 (39.9) |
   Female | 426 (75.7) | 1173 (60.5) | 1352(60.1) |
Side | Â | Â | Â |
   Right | 303 (53.8) | 1052 (54.3) | 1191 (53.0) |
   Left | 260 (46.2) | 886 (45.7) | 1058 (47.0) |
Age at surgery | Â | Â | Â |
   Lower than 40 | 2 (0.4) | 80 (4.1) | 326 (14.5) |
   Between 40 and 69 | 151 (26.8) | 1311 (67.7) | 1503 (66.8) |
   Higher than 70 | 410 (72.8) | 547 (28.2) | 420 (18.7) |
Charnley's hip score | Â | Â | Â |
   Class A | 360 (63.9) | 1294 (66.8) | 1373 (61.0) |
   Class B+C | 203 (36.1) | 644 (33.2) | 876 (39.0) |
Skills of surgeon | Â | Â | Â |
   Less than 400 operations (68 surgeons) | 352 (62.5) | 1225 (63.2) | 569 (25.3) |
   More than 400 operations (4 surgeons) | 211 (37.5) | 713 (36.8) | 1680 (74.7) |
Diagnosis in primary arthroplasty | Â | Â | Â |
   Primary arthritis | 299 (53.1) | 1156 (59.6) | 1212 (53.9) |
   Sequelae of congenital and pediatric diseases | 35 (6.2) | 321 (16.6) | 509 (22.6) |
   Femoral neck fracture and sequelae | 158 (28.1) | 272 (14.0) | 251 (11.2) |
   Other | 71 (12.6) | 189 (9.8) | 277 (12.3) |