Table 2 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 stem | ||||
|---|---|---|---|---|---|
| Â | Straight cemented | Anatomic cemented or straight cemented with particular design | Straight cementless | Surface treated or anatomic cementless | Modular cementless |
| Â | N. (%) | N. (%) | N. (%) | N. (%) | N. (%) |
Gender | Â | Â | Â | Â | Â |
   Male | 482 (32.7) | 167 (39.5) | 300 (38.4) | 414 (37.6) | 436 (45.0) |
   Female | 994 (67.3) | 256 (60.5) | 482 (61.6) | 687 (62.4) | 532 (55.0) |
Side | Â | Â | Â | Â | Â |
   Right | 829 (56.2) | 227 (53.7) | 398 (50.9) | 588 (53.4) | 504 (52.1) |
   Left | 647 (43.8) | 196 (46.3) | 384 (49.1) | 513 (46.6) | 464 (47.9) |
Age at surgery | Â | Â | Â | Â | Â |
   Lower than 40 | 25 (1.7) | 5 (1.2) | 159 (20.3) | 92 (8.4) | 127 (13.1) |
   Between 40 and 69 | 748 (50.7) | 256 (60.5) | 574 (73.4) | 663 (60.2) | 724 (74.8) |
   Higher than 70 | 703 (47.6) | 162 (38.3) | 49 (6.3) | 346 (31.4) | 117 (12.1) |
Charnley's hip score | Â | Â | Â | Â | Â |
   Class A | 937 (63.5) | 304 (71.9) | 511 (65.3) | 670 (60.9) | 605 (62.5) |
   Class B+C | 539 (36.5) | 119 (28.1) | 271 (34.7) | 431 (39.1) | 363 (37.5) |
Skills of surgeon | Â | Â | Â | Â | Â |
   Less than 400 operations (68 surgeons) | 710 (48.1) | 393 (92.9) | 538 (68.8) | 378 (34.3) | 127 (13.1) |
   More than 400 operations (4 surgeons) | 766 (51.9) | 30 (7.1) | 244 (31.2) | 723 (65.7) | 841 (86.9) |
Diagnosis in primary arthroplasty | Â | Â | Â | Â | Â |
   Primary arthritis | 831 (56.3) | 296 (70.0) | 321 (41.1) | 676 (61.4) | 543 (56.1) |
   Sequelae of congenital and pediatric diseases | 155 (10.5) | 28 (6.6) | 278 (35.5) | 171 (15.5) | 233 (24.1) |
   Femoral neck fracture and sequelae | 300 (20.3) | 70 (16.5) | 81 (10.4) | 141 (12.8) | 89 (9.2) |
   Other | 190 (12.9) | 29 (6.9) | 102 (13.0) | 113 (10.3) | 103 (10.6) |