Table 1

Demographic, surgical and care profiles across the study periods

Baseline audit n=93Postintervention n=347p Value
Demographic
Age, mean years (SD)69.7 (7.9)69.3 (8.1)0.68
Female, n (%)64 (69)232 (67)0.75
Body mass index (kg/m2), mean (SD)31.9 (5.8)31.9 (6.4)0.98
Osteoarthritis as primary diagnosis, n (%)84 (96)332 (96)0.76
Preoperative haemoglobin (g/l), mean (SD)138.9 (13.7)140.6 (13.4)0.31
Cardiac disease, n (%)20 (22)85 (24)0.59
Respiratory, n (%)19 (21)95 (27)0.20
Renal, n (%)7 (8)12 (3)0.09
Hypertension, n (%)52 (57)245 (70)0.01
Surgical
General anaesthetic+peripheral nerve block, n (%)47 (52)190 (57)0.36
Cement fixation, n (%)56 (60)310 (90)<0.01
Surgical time (min), mean (SD)114.9 (24.0)115.1 (22.7)0.95
Tourniquet time (min), mean (SD)98.9 (21.4)86.2 (27.9)<0.01
Postoperative drainage (ml), mean (SD)611.5 (316.8)509.0 (307.9)<0.01
Care protocols
Continuous passive motion therapyNot routineNot routine
CryotherapyNot routineNot routine
Low-molecular-weight heparinRoutine prescription postsurgery unless contraindicatedRoutine prescription postsurgery unless contraindicated
Intra-articular drain removed at 24 h postsurgeryRoutineRoutine