TKA patients with postoperative anaemia [ haemoglobin ( Hb ) 8.5-12 .0 g dl ( -1 ) ] without prior transfusions were randomly assigned to FCM [ 700-1000 mg iron ( according to calculate iron deficit on postoperative day 2 ) ] or ferrous glycine sulphate ( FS ; 100 mg iron daily from day 7 onwards ) and followed for Hb , iron status , quality-of-life ( EQ-5D ) , and performance ( 6 min walk test ) until day 30 .