Table 1 Demographics for patients in the two study groups

Mean age (years)

73.4 (24–90)

71.7 (24–92)

Male (%)/female (%)

27.7 %/72.3 %

29.0 %/71.0 %

Body mass index

 Underweight (≤19)

0.2 %

0.2 %

 Normal (20–25)

27.8 %

19.3 %

 Overweight (26–29)

45.5 %

46.4 %

 Obese (≥30)

26.4 %

34.1 %

Indication for TKA

 Primary arthritis (%)

89.9 %

87.1 %

 Deformity (%)

3.4 %

6.9 %

 Rheumatoid arthritis (%)

2.4 %

1.3 %

 Post-traumatic arthritis (%)

2.2 %

1.2 %

 Chondrocalcinosis (%)

1.0 %

1.0 %

 Sequelae of osteotomy (%)

0.6 %

0.8 %

 Other (%)

0.6 %

1.7 %