Table 1.

Pre-operative comorbidity of patients referred for total knee arthroplasty (TKA)

Comorbiditya	Frequency of disease (n)
Ischemic heart disease	7
Atrial fibrillation	5
Hypertension	4
Myocardial infarction	3
COAD	2
Congestive cardiac failure	2
Deep vein thrombosis/PE	2
Chronic anaemia	1

^aCOAD, Chronic obstructive airway disease; PE, pulmonary embolism