Implant

Copeland Mark 2 (pre-HA coating)

Copeland Mark 3

SCAN

SCAN

Durom

Indication

Mixed

Mixed

Rheumatoid

Rheumatoid

Rheumatoid

No. of replacements

103

48

39

72

45

Average age at surgery (years)

64.3

70

55

51

62.7

Follow-up (months)

60–120 (mean 80)

24–63 (mean 34.2)

24–72 (mean 52)

50–95 (mean 50)

45.1 ± 11

Mean preoperative Constant score

15.4

16.4

NA

NA

19.5

Mean postoperative Constant score

52.4

54

30

Not available but 92% of patients satisfied with pain improvement

62.6

Preoperative VAS

NA

NA

80 (median)

NA

Postoperative VAS

NA

NA

16 (median)

15–32 (mean)

NA

Radiologic lucent/lytic lines

5.1% (pre-HA coating)

6.3%

20%

25%

0%

Overall patients satisfied

93.9%

NA

83%

92%

94%