The probability for needing a blood transfusion following total joint arthroplasty for the knee or hip can be estimated from certain clinical parameters. This can help especially in minimizing wastage of autologous units.
Predictor
Value
Points
hemoglobin in g/L
> 130
0
111 - 130
2
<= 110
3
weight in kilograms
> 100
0
81 - 100
1
<= 80
2
arthroplasty type
knee
0
hip
2
bilateral knee
3
bilateral hip
6
primary or revision surgery
primary
0
revision
2
predictive score =
= SUM(points for 4 predictors)
Interpretation:
• minimum score: 0
• maximum score: 13
• usual observed range: 0 to 10
Predictive Score
Group
Frequency of Blood Transfusion
<= 2
1
1.7%
3 or 4
2
11%
5, 6, 7
3
40%
>= 8
4
78.3%
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