Table 1.
Baseline Characteristics.
| Male (N = 70) | Female (N = 102) | Total (172) | |
|---|---|---|---|
| Age | 68.1 (SD = 8.6) | 66.3 (SD = 8.0) | 67.0 (SD = 8.3) |
| Side | |||
| Right | 25 | 50 | 79 |
| Left | 45 | 54 | 95 |
| Race | |||
| Caucasian | 63 (92.6%) | 83 (82.2%) | 146 (84.9%) |
| African American | 5 (7.4%) | 17 (16.8%) | 22 (12.8%) |
| Asian | 0 | 1 (1.0%) | 1 (0.6%) |
| Other or N/A | 2 | 1 | 3 |
| BMI | 29.5 (SD = 3.9) | 30.7 (SD = 5.6) | 30.2 (SD = 5.0) |
| Days between OAI visit with x-ray and TKA | 225.8 (SD = 198.8) | 238.2 (SD = 194.4) | 233.2 (SD = 196.3) |
| Years between TKA and outcome measures | 2.8 (SD = 1.5) | 3.0 (SD = 1.5) | 3.0 (SD = 1.5, 0.5-6.1) |
| Preop | |||
| WOMAC total (0-96) | 29.8 (SD = 16.9) | 38.6 (SD = 17.2) | 35.0 (SD = 17.6) |
| WOMAC pain (0-20) | 6.4 (SD = 3.7) | 8.0 (SD = 4.1) | 7.3 (SD = 4.0) |
| WOMAC disability (0-68) | 20.4 (SD = 12.8) | 26.7 (SD = 12.5) | 24.1 (SD = 13.0) |
| WOMAC stiffness (0-8) | 3.1 (SD = 1.8) | 3.9 (SD = 1.6) | 3.6 (SD = 1.7) |
| Postop | |||
| WOMAC total (0-96) | 10.8 (SD = 13.2) | 13.9 (SD = 13.4) | 12.6 (SD = 13.4) |
| WOMAC pain (0-20) | 1.9 (SD = 2.6) | 2.2 (SD = 2.7) | 2.1 (SD = 2.7) |
| WOMAC disability (0-68) | 7.5 (SD = 9.6) | 9.9 (SD = 10.1) | 8.9 (SD = 10.0) |
| WOMAC stiffness (0-8) | 1.4 (SD = 1.4) | 1.8 (SD = 1.5) | 1.6 (SD = 1.5) |
| Gain/lossa | |||
| WOMAC total | 19.0 (SD = 18.7) | 24.7 (SD = 20.3) | 22.4 (SD = 19.9) |
| WOMAC pain | 4.5 (SD = 3.8) | 5.8 (SD = 4.8) | 5.3 (SD = 4.4) |
| WOMAC disability | 12.9 (SD = 14.3) | 16.7 (SD = 14.7) | 15.2 (SD = 14.7) |
Abbreviations: BMI, body mass index; SD, standard deviation; N/A, not applicable; OAI, Osteoarthritis Initiative; preop; preoperative; postop; postoperative; TKA, total knee arthroplasty; WOMAC, Western Ontario and McMaster Universities Arthritis Index. aChange in WOMAC Total or WOMAC Disability is presented as a decrease in WOMAC score - i.e. a positive change would represent an overall decrease in score.