Page 31 - The value of total hip and knee arthroplasties for patients

and 970/1636 TKA patients (59%) returned the preoperative questionnaire. Table 1 shows the variation of the included patients per hospital, the proportions ranged between 50-78% for THA and 50-80% for TKA.
Fig 1. Flow Diagram
2
feasibility of collecting multiple PROMs
THA eligible and Informed about the study Jun 2012- Dec 2014
N=1893
TKA eligible and informed about the study Jun 2012-Dec 2014
N=1738
Did not agree to be contacted N=97
Agreed to be contacted and approached N=1796
Did not agree to be contacted N=102
Agreed to be contacted and approached N=1636
 Refused to participate N=761
 Refused to participate N=402
Returned pre-op N=1035
Returned pre-op N=970
 Died N=6
 Too ill N=2
 OK cancelled N=1
 Refused to participate N=7
 Contact lost N=19
 Died N=3
 Too ill N=1
 OK cancelled N=5
 Refused to participate N=6
 Contact lost N=23 
Eligible patients at 6 months N=932
Did not return 6 month FU questionnaire N= 102
Eligible patients at 6 months N=1000
Did not return 6 month FU questionnaire N= 105
Returned 6-months FU questionnaire N=898
Returned 6-months FU questionnaire N=827
 Too ill N=1
 Refused to participate N=5
 Contact lost= N=2 
 Died N=5
 Refused to participate N=3
 Contact lost= N=7
Eligible patients at 1 yr N=992
Eligible patients at 1 yr N=917
Did not return 12 months FU questionnaire N=126
Did not return 12 months FU questionnaire N=146
1-yr FU of whom eligible in December 2016* N=866
1-yr FU of whom eligible in December 2016* N=771
 Died N=4
 Too ill N=1
 Refused to participate N=4
 Contact lost= N=2
 Had not yet reached FU date N=9
Eligible patients at 2 yr N=972
Eligible patients at 2 yr N=906
 Died N=3
 Too ill N=1
 Refused to participate N=2
 Had not yet reached FU date N=5
Did not return 24 months FU questionnaire N=160
Did not return 24 month FU questionnaire N=150
2-yr FU of whom eligible in December 2016* N=812
2-yr FU of whom eligible in December 2016* N=756
Fig 1. Flow Diagram
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