Table 1.
Demographic Features of Study Cohort
| Primary TKA (n=17,633) | |
|---|---|
| Mean (standard deviation) or n (%) | |
| Mean Follow-up in years | 6.3 (4.7) |
| Male /Female | 7,852 (45%)/9,781 (55%) |
| Unilateral/bilateral | 12,914 (73%)/4,719 (27%) |
| Age at Surgery in years | 68.4 (10.0) |
| Age Category | |
| ≤60 years | 3352 (19%) |
| 61-70 years | 6206 (35.2%) |
| 71-80 years | 6493 (36.8%) |
| >80 years | 1582 (9%) |
| Body Mass Index (BMI) in kg/m2 | 31.2 (6.15) |
| BMI Category, kg/m2 | |
| Missing | 67 (0.4%) |
| Normal, < 25.0 | 2,362 (13.4%) |
| Overweight, 25-29.9 | 5,961 (33.9%) |
| Obese, 30-39.9 | 7,710 (43.9%) |
| Morbidly obese, ≥40.0 | 1,533 (8.7%) |
| ASAScore | |
| Missing | 67 (0.4%) |
| 1 | 291 (1.7%) |
| 2 | 9,614 (54.7%) |
| 3 | 7,544 (42.9%) |
| 4 | 117 (0.7%) |
| Deyo-Charlson Index Group | |
| Heart disease | 1794 (10.2%) |
| Peripheral vascular disease | 1106 (6.3%) |
| Cerebrovascular disease | 1678 (3.6%) |
| Moderate-severe Renal disease | 1320 (7.5%) |
| Peptic ulcer disease | 1721 (9.8%) |
| Chronic Obstructive Pulmonary disease | 2228 (12.6%) |
| Diabetes | 2217 (12.6%) |
| Connective tissue disease | 1596 (9.1%) |
| Cancer | 2925 (16.6%) |
| Other (dementia, liver disease, AIDS) | 1173 (6.7%) |
| Operative Diagnosis (Primary) | |
| Osteoarthritis | 16372 (92.8%) |
| Rheumatoid/inflammatory arthritis | 657 (3.7%) |
| Othera | 604 (3.4%) |
| Implant Fixation | |
| Uncemented | 1555 (8.8%) |
| Cemented or hybrid* | 16078 (91.2%) |
a
Other diagnoses included genu varum, genu valgum, hemophilia, paget’s disease, failed previous disease including arthrodesis, failed previous osteotomy, failed previous patellectomy, Chacot arthropathy, chondromalacia, pigmented villonodular synovitis etc.
ASA, American Society of Anesthesiologists