Table 1 Overview of patient cohorts and associated demographics. SD standard deviation, IQR inter-quartile range

Total No. (BMI > 30)

10202

2406

7796

4642

3154

1849

557

Total Prosthesis Years

86,098

12,731

73,367

42,200

31,167

11,134

1598

Mean Follow-Up (SD) {years}

8.4 (4.4)

5.3 (2.3)

9.4 (4.4)

9.1 (4.3)

9.88 (4.6)

6.0 (2.1)

2.9 (1.0)

Range {years}

1–20.1

1–11.2

1–20.1

1–19.9

1–20.1

1–11.2

1–4.6

Median (IQR) {years}

7.8 (4.9–11.5)

5.2 (3.5–6.9)

9.2 (6.0–12.7)

9.0 (5.8–12.1)

9.5 (6.2–13.4)

6.0 (4.6–7.6)

3.2 (1.9–3.7)

Female

5922 (58%)

1463 (61%)

4459 (57%)

2681 (58%)

1778 (56%)

1135 (61%)

328 (59%)

Age {years}

  < 65

2933 (29%)

694 (29%)

2239 (29%)

1418 (31%)

821 (26%)

553 (30%)

141 (25%)

 65–74

3497 (34%)

889 (37%)

2883 (37%)

1668 (36%)

1215 (39%)

683 (37%)

206 (37%)

  ≥ 75

3772 (37%)

823 (34%)

2674 (34%)

1556 (36%)

1118 (35%)

613 (33%)

210 (38%)

ASA

 I

891 (9%)

143 (6%)

748 (10%)

354 (8%)

394 (12%)

127 (7%)

16 (3%)

 II

7116 (70%)

1703 (71%)

5413 (69%)

3311 (71%)

2102 (667%)

1318 (71%)

385 (69%)

 III

2148 (21%)

552 (23%)

1596 (20%)

957 (21%)

639 (20%)

397 (21%)

155 (28%)

 IV

45 (< 1%)

8 (< 1%)

37 (< 1%)

18 (< 1%)

19 (< 1%)

7 (< 1%)

1 (< 1%)

 V

2 (< 1%)

0 (< 1%)

2 (< 1%)

2 (< 1%)

0 (< 1%)

0 (0%)

0 (0%)

No Surgeons

32

15

27

24

19

13

11

Indication

 OA

9955 (98%)

2349 (98%)

7606 (98%)

4517 (97%)

3089 (98%)

1808 (98%)

541 (97%)

 Inflammatory Arthropathy

187 (2%)

42 (2%)

145 (2%)

95 (2%)

50 (2%)

31 (2%)

11 (2%)

 AVN

16 (< 1%)

3 (< 1%)

13 (< 1%)

10 (< 1%)

3 (< 1%)

1 (< 1%)

2 (< 1%)

 Trauma

15 (< 1%)

8 (< 1%)

7 (< 1%)

5 (< 1%)

2 (< 1%)

6 (< 1%)

2 (< 1%)

 Prev Infection

4 (< 1%)

1 (< 1%)

3 (< 1%)

3 (< 1%)

0 (< 1%)

1 (< 1%)

0 (0%)

 Other

23 (< 1%)

3 (< 1%)

20 (< 1%)

11 (< 1%)

10 (< 1%)

2 (< 1%)

1 (< 1%)

Meniscal Constraint

 Unconstrained Mobile

1608 (16%)

1498 (62%)

110 (2%)

8 (< 1%)

102 (3%)

975 (53%)

523 (94%)

 Unconstrained Fixed

6557 (64%)

666 (28%)

5891 (75%)

3158 (68%)

2733 (87%)

666 (36%)

0 (0%)

 PS mobile

978 (10%)

191 (8%)

787 (10%)

659 (14%)

128 (4%)

157 (8%)

34 (6%)

 PS Fixed

1059 (10%)

51 (2%)

1008 (13%)

817 (18%)

191 (6%)

51 (3%)

0 (0%)