12 months following primary total ankle replacement | |||
---|---|---|---|
Reoperation | No-reoperation | ||
Age | n (proportion) | n (proportion) | OR (95% CI, p value) |
<65 | 31 (0.43) | 395 (0.38) | Ref |
65–74 | 21 (0.29) | 376 (0.36) | 0.7 (0.4 to 1.3, p=0.24) |
>75 | 20 (0.28) | 267 (0.26) | 0.9 (0.5 to 1.8, p=0.87) |
Length of stay | Mean (range) | Mean (range) | |
4.6 (0–46) | 3.8 (0–41) | p=0.25 | |
BMI | n (proportion) | n (proportion) | OR (95% CI, p value) |
Underweight | 1 (0.03) | 4 (0.006) | 5 (0.1 to 62, p=0.2) |
Normal | 6 (0.18) | 122 (0.2) | Ref |
Overweight | 16 (0.47) | 258 (0.42) | 1.3 (0.5 to 4, p=0.6) |
Obese | 11 (0.32) | 237 (0.38) | 0.9 (0.3 to 3.2, p=0.9) |
Missing=455 | |||
Gender/F | 42.5% | 43.1% | |
Indications | n (proportion) | n (proportion) | OR (95% CI, p value) |
Osteoarthritis | 52 (0.72) | 891 (0.86) | Ref |
Rheumatoid arthritis | 13 (0.18) | 95 (0.09) | 2.3 (1.2 to 4.6, p=0.008) |
Inflammatory | 3 (0.04) | 20 (0.02) | 2.6 (0.5 to 9, p=0.12) |
Other | 4 (0.06) | 32 (0.03) | 2.1 (0.5 to 6.4, p=0.16) |
Operation | n (proportion) | n (proportion) | OR (95% CI, p value) |
Uncemented | 69 (0.96) | 1023 (0.99) | Ref |
Cement | 3 (0.04) | 12 (0.01) | 3.7(1.2 to 14, p=0.03) |
Hybrid | 0 (0) | 3 (0.002) | – |
Approach | n (proportion) | n (proportion) | OR (95% CI, p value) |
Anterior | 69 (0.99) | 1000 (0.98) | Ref |
Lateral | 1 (0.01) | 7 (0.01) | 2.1 (0.05 to 16, p=0.42) |
Ant-lateral | 0 (0) | 10 (0.01) | – |
Missing=23 | |||
Organisation | n (proportion) | n (proportion) | OR (95% CI, p value) |
NHS | 64 (0.88) | 918 (0.88) | Ref |
Independent hospital (NHS funded) | 4 (0.06) | 71 (0.07) | 0.8 (0.2 to 2.3, p=0.68) |
Independent treatment centre (NHS funded) | 4 (0.06) | 49 (0.05) | 1.2 (0.3 to 3.4, p=0.77) |
Grade of surgeon | n (proportion) | n (proportion) | OR (95% CI, p value) |
Consultant | 69 (0.96) | 975 (0.94) | Ref |
Other | 3 (0.04) | 63 (0.06) | 0.7 (0.1 to 2.2, p=0.8) |
ASA | n (proportion) | n (proportion) | OR (95% CI, p value) |
1 | 4 (0.05) | 155 (0.15) | Ref |
2 | 53 (0.73) | 722 (0.7) | 2.8 (1.1 to 11, p=0.04) |
3 | 15 (0.21) | 157 (0.15) | 3.9 (1.2 to 16, p=0.01) |
4 | 0 (0) | 4 (0.004) | – |
Charlson | n (proportion) | n (proportion) | |
0 | 73 (1.0) | 1090 (0.98) | |
1 | 0 (0) | 18 (0.02) | |
2 | 0 (0) | 4 (0.004) |
ASA, American Society of Anesthesiologists; BMI, body mass index; CI, confidence interval; F, female; n, number of patients; NHS, National Health Service; OR, odds ratio; Ref, reference value; SD, standard deviation.