Table 3.
Demographics of the study populations
| Hips with HHS preoperatively (n = 2667) | Hips with HHS preoperative and 2 years (n = 1036) | Hips with HHS preoperative and 5 years (n = 669) | |
|---|---|---|---|
| Age in years, Mean (SD) | 64 (14) | 65 (13) | 64 (13) |
| Male, n (%) | 1315 (49.3 %) | 501 (48.4 %) | 317 (47.4 %) |
| Age Groups, n (%) | |||
| < = 60 years | 889 (33.3 %) | 316 (30.5 %) | 224 (33.5 %) |
| 61–70 years | 754 (28.3 %) | 291 (28.1 %) | 196 (29.3 %) |
| 71–80 years | 894 (30.2 %) | 325 (31.4 %) | 206 (30.8 %) |
| ≥ 81 years | 220 (8.2 %) | 104 (10.0 %) | 43 (6.4 %) |
| Body Mass Indexa, n (%) | |||
| < 25 kg/m2 | 587 (22.2 %) | 215 (20.8 %) | 160 (24.1 %) |
| 25–29.9 kg/m2 | 1032 (38.9 %) | 414 (40.2 %) | 258 (38.8 %) |
| 30–34.9 kg/m2 | 646 (24.4 %) | 262 (25.4 %) | 159 (23.9 %) |
| 35–39.9 kg/m2 | 235 (8.9 %) | 92 (8.9 %) | 56 (8.4 %) |
| ≥ 40 kg/m2 | 150 (5.7 %) | 48 (4.7 %) | 32 (4.8 %) |
| American Society of Anesthesiologists Class (ASA)b, n (%) | |||
| Class I-II | 1654 (62.1 %) | 645 (62.4 %) | 444 (66.5 %) |
| Class II-IV | 1008 (37.9 %) | 388 (37.6 %) | 224 (33.5 %) |
| Deyo-Charlson Index, mean (SD) | 1.1 (2.0) | 1.1 (1.9) | 1.0 (1.9) |
| Psychological Comorbidity, n (%) | |||
| Anxiety | 135 (5.1 %) | 47 (4.5 %) | 30 (4.5 %) |
| Depression | 231 (8.7 %) | 78 (7.5 %) | 50 (7.5 %) |
| Total number of Joints Replaced | |||
| 1 | 2159 (81.0 %) | 824 (68.5 %) | 525 (78.5 %) |
| 2 | 463 (17.4 %) | 194 (18.7 %) | 135 (20.2 %) |
| 3 | 38 (1.4 %) | 15 (1.4 %) | 6 (0.9 %) |
| 4 | 7 (0.3 %) | 3 (0.3 %) | 3 (0.4 %) |
| Underlying Diagnosis, n (%) | |||
| Osteoarthritis | 2404 (90.1 %) | 952 (91.9 %) | 598 (89.4 %) |
| RA/Inflammatory Arthritis | 49 (1.8 %) | 18 (1.7 %) | 14 (2.1 %) |
| Other | 214 (8.0 %0 | 66 (6.4 %) | 57 (8.5 %) |
Missing data for preoperative, preoperative and 2-year and preoperative and 5-year HHS cohorts were as follows
aFor BMI, there were 17, 5 and 4 missing cases, respectively
bFor ASA, there were 5, 3 and 1 missing cases, respectively