Page 45 - The value of total hip and knee arthroplasties for patients

Outcome of total hip arthroplasty, but not of total knee arthroplasty, is related to the preoperative radiographic severity of osteoarthritis
Lost to follow –up (n=237)
 Lost to follow up (n=79)
 Excluded (n=6):
 Too sick (n=2)
 Dead (n=4)
Missing radiographs (n=41
Hip replacements Oct 2010-Sept 2012 (n=745)
Wanted to participate (=Inclusion in Vespa Study)
n=428
1-year follow up
n=343
Included hips
n=302
Knee replacements Oct 2010-Sept 2012
(n=614)
Excluded* (n=80)
Hip replacement for primary osteoarthritis (n=665)
Knee replacement for primary osteoarthritis (n=599)
Wanted to participate (=Inclusion in Vespa Study)
n=417
1-year follow up
n=322
Included knees
n=271
Excluded* (n=15)
Lost to follow –up (n=182)
 Lost to follow up (n=88)
 Excluded (n=7):
 Too sick (n=3)
 Dead (n=4)
Missing radiographs (n=51)
Figure 1. Flow diagram. Figure 1. Flow diagram.
* Reasons for exclusion were patients who did not understand Dutch or werebeing physically or mentally
* Reasons for exclusion were patients who did not understand Dutch or werebeing physically or mentally able to
able to complete questionnaires, patients with revision surgery, undergoing a hemi-arthroplasty, or undergoing
complete questionnaires, patients with revision surgery, undergoing a hemi-arthroplasty, or undergoing a THA or aTHAorTKKAAbecbaeusceaoufsaetuomfoaroturmrheourmoatroirdhaeruthmritaist.oidarthritis.
The Short Form-36 survey (SF-36),9, 10 the EuroQol 5 dimensional (EQ5D), and the EuroQol visual analog scale (EQ-VAS) were used to assess general health-related quality of life. From the SF-36, summary component scores for physical health (PCS) and mental health (MCS) were calculated. In this study, scores from a general Dutch population were used to standardize our scores in order to apply the norm-based scoring.11
Preoperative radiographic severity
Preoperative supine radiographs of hips (anterior-posterior) and weight-bearing radiographs of the knees (posterioranterior) had been taken routinely in the participating centers for preoperative templating purposes. All radiographs were assessed by an experienced musculoskeletal radiologist (HMK), who was blinded regarding patient characteristics. The Kellgren and Lawrence (KL) grading system
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