Table 3.
Univariate analysis of various factors for combined acetabular cup position within the Lewinnek’s “safe zone”
| Factor | No. (%) of hips | p value* | ||
|---|---|---|---|---|
| Total | Within Lewinnek’s zone | Outside Lewinnek’s zone | ||
| Age, yr (n = 1010) | 1010 | 440 (43.6) | 570 (56.4) | 0.33 |
| < 50 | 36 | 19 (52.8) | 17 (47.2) | |
| 50–69 | 359 | 148 (41.2) | 211 (58.8) | |
| ≥ 70 | 615 | 273 (44.4) | 342 (55.6) | |
| Sex (n = 1010) | < 0.001 | |||
| Male | 415 | 210 (50.6) | 205 (49.4) | |
| Female | 595 | 230 (38.7) | 365 (61.3) | |
| Body mass index (n = 965) | 0.020 | |||
| ≤ 24.99 | 214 | 71 (33.2) | 143 (66.8) | |
| 25–29.99 | 343 | 165 (48.1) | 178 (51.9) | |
| 30–34.99 | 247 | 111 (44.9) | 136 (55.1) | |
| 35–39.99 | 101 | 50 (49.5) | 51 (50.5) | |
| ≥ 40 | 60 | 20 (33.3) | 40 (66.7) | |
| Head size (n = 1009) | 0.32 | |||
| ≤ 28 mm | 291 | 118 (40.5) | 173 (59.5) | |
| 32 mm | 509 | 222 (43.6) | 287 (56.4) | |
| ≥ 36 mm | 209 | 99 (47.4) | 110 (52.6) | |
| Outer cup diameter (n = 1002) | 0.06 | |||
| < 52 mm | 44 | 16 (36.4) | 28 (63.6) | |
| 52–56 mm | 639 | 266 (41.6) | 373 (58.4) | |
| > 56 mm | 319 | 156 (48.9) | 163 (51.1) | |
*
χ2 test.