Table 1.
Demographic Features of Study Cohort as mean (standard deviation) of n (%)
| Primary THR (n=14,065) | |
|---|---|
| Mean Follow-up in years | 6.3 (4.7) |
| Male/Female | 6,819 (48.5%)/7,246 (51.5%) |
| % bilateral | 2,293 (16.3%) |
| Age at Surgery in years | 64.6 (13.7) |
| Age Category | |
| ≤60 years | 4,455 (31.7%) |
| 61–70 years | 4,252 (30.2%) |
| 71–80 years | 4,119 (29.3%) |
| >80 years | 1,239 (8.8%) |
| Body Mass Index (BMI) in kg/m2 | 29.0 (5.8) |
| BMI Category | |
| Missing | 72 (0.5%) |
| Normal < 25.0 kg/m2 | 3,429 (24.5%) |
| Overweight 25–29.9 kg/m2 | 5,334 (38.1%) |
| Obese, 30–39.9 kg/m2 | 4,589 (32.8%) |
| Morbidly Obese, III ≥ 40.0 kg/m2 | 641 (4.6%) |
| American Society of Anesthesiologists (ASA) Class | |
| 1 | 653 (4.7%) |
| 2 | 7,947 (56.7%) |
| 3 | 5,254 (37.5%) |
| 4 | 151 (1.1%) |
| Mean Deyo- Charlson Index | 1.3 (2.2) |
| Sum of comorbidities on Deyo-Charlson Index | |
| 0 | 7,520 (53.5%) |
| 1 | 2,393 (17%) |
| 2 | 1,640 (11.7%) |
| 3+ | 2,512 (17.9%) |
| Prior Cardiac Event | |
| No | 11,879 (84.5%) |
| Yes | 2,186 (15.5%) |
| Prior Thromboembolic Event | |
| No | 13,574 (96.5%) |
| Yes | 491 (3.5%) |
| Diagnosisa | |
| Osteoarthritis | 12,252 (87.1%) |
| Rheumatoid and inflammatory arthritis | 371 (2.6%) |
| Avascular necrosis | 1,021 (7.3%) |
| Other | 421 (3%) |
| Implant Fixation | |
| Uncemented | 8,796 (62.5%) |
| Cemented or hybrid* | 5,269 (37.5%) |
a
Rheumatoid and inflammatory arthritis category included other inflammatory arthritis such as psoriatic arthritis and ankylosing spondylitis etc.
Other diagnoses present in 421 hips included the following: Hip dysplasia, Legg-Perthe’s, disease, Slipped capital femoral epiphyses, failed previous osteotomy, failed previous arthrodeses, failed previous internal fixation, congenital dislocation of hip (CDH), pigmented villonodular synovitis, hemacrhomatosis, synovial chondromatosis among others ASA class was missing in 60 (0.4%) THRs