Table 2.
Study description and results for cohort studies
| Study, design and quality | Demographics | Outcomes and results | |||||
|---|---|---|---|---|---|---|---|
| Inacio et al. [26] | Total | THA | TKA | THA | TKA | ||
| USA | No. of participants | 9675 | 2554 | 7121 | DSSI (adjusted OR and 95 % CI) | 3.77 (1.59–8.95) | 1.67 (0.77–3.61) |
| Retrospective cohort | Lost ≥5 % of body weight (%)a | 1381 (14.3) | 444 (17.4) | 937 (13.2) | SSSI (adjusted OR and 95 % CI) | 0.95 (0.27–3.30) | 1.41 (0.41–4.85) |
| NOS quality score: 9 | Gender (% female) who: | 90-day Re-ad (adjusted OR and 95 % CI) | 1.18 (0.72–1.93) | 1.63 (1.16–2.28) | |||
| • Lost weight | 67 | 65.1 | 68.2 | ||||
| • Stayed the same | 59.7 | 52.6 | 62.1 | ||||
| Age (% <65 years)b | 43.9 | 46.4 | 43.0 | ||||
| BMI (%)b | |||||||
| • ≥30 and <35 kg/m2 | 52.1 | 55.2 | 51.0 | ||||
| • ≥35 kg/m2 | 39.7 | 33.3 | 41.9 | ||||
| ᅟ | |||||||
| Inacio et al. [27] | Total | THA | TKA | THA | TKA | ||
| USA | No. of participants | 14,784 | 4066 | 10,718 | DSSI (adjusted OR and 95 % CI) | 1.83 (0.83–4.02) | 1.27 (0.66–2.42) |
| Retrospective cohort | Lost ≥5 % of body weight (%)a | 2064 (14.0) | 732 (18.0) | 1332 (12.4) | SSSI (adjusted OR and 95 % CI) | 1.16 (0.43–3.13) | 0.83 (0.29–2.37) |
| NOS quality score: 9 | Gender (% female) who: | 90-day Re-ad (adjusted OR and 95 % CI) | 1.05 (0.70–1.57) | 1.20 (0.88–1.63) | |||
| • Lost weight | 64.9 | 61.2 | 67 | ||||
| • Stayed the same | 60.7 | 61.2 | 63.4 | ||||
| • Gained weight | 65.3 | 54.3 | 68.8 | ||||
| Age (% <65 years)b | 46.6 | 50.8 | 33.0 | ||||
| BMI (%)b | |||||||
| • ≥30 and <35 kg/m2 | 50.8 | 53.5 | 49.7 | ||||
| • ≥35 kg/m2 | 41.0 | 35.3 | 43.2 | ||||
DSSI deep surgical site infection up to 1 year post-TJA, SSSI superficial surgical site infection within 30 days of TJA, Re-ad readmission, NOS Newcastle Ottawa Scale for cohort studies
aNumber of patients who lost weight pre-operatively and kept it off post-operatively
bPercentage based on total sample size