Page 33 - The value of total hip and knee arthroplasties for patients

Response rates over time in eligible patients
At 6-month follow-up, 35 THA and 38 TKA patients were considered lost to
follow-up. Therefore, 1000 THA (97%) and 932 (96%) TKA patients were eligible 2 for 6-month follow-up. Of the eligible patients, 898/1000 THA patients (90%) and
827/932 TKA (89%) patients returned the follow-up questionnaire. Between 6
months and one year follow-up 8 THA and 15 TKA patients were lost to follow-up.
The response rates at the one-year follow-up were 866 of the 992 eligible THA
patients (87%) and 771 of the 917 eligible TKA patients (84%).
At two-year follow-up, with respect to one-year follow-up, 9 more THA and 6 more
TKA patients were lost to follow-up. Furthermore, at the date of analysis, 9 THA
and 5 TKA patients had not reached the two-year follow-up yet. Of the 972 eligible
THA and 906 eligible TKA patients, 812 THA (84%) and 756 TKA patients (83%)
completed the 2-year questionnaire (table 2).
Overall response rates over time
As expected the overall response rates decreased over time (table 2).The 2-year questionnaire was completed by 78.5% of the initially included THA patients and by 77.9% of the initial included TKA patients.
Characteristics of patients included at baseline
The baseline characteristics are depicted in table 3.The mean age of the included 1035THA patients was 68 years (SD 10.0) and 71 years (SD 9.5) for the 970TKA patients, the majority of the patients was female and approximately a quarter of the patients were employed (i.e. having a paid job)
Pre-operative PROMs
The mean (SD) HOOS and KOOS ADL, Pain, Quality of Life, Sport and Recreation and Symptoms scores ranged between 18 (SD 18.9) and 46 (SD 23.5) for patients undergoing THA and 11 (SD 14.2) and 44 (SD 18.5) for patients undergoing TKA. Furthermore, the OHS and OKS scores were 24 in both groups (SD 8.4 for OHS and SD 7.7 for OKS).
The mean EQ5D and EQ VAS scores were 0.60 (SD 0.26) and 66 (SD 18.5) for patients undergoing THA and 0.64 (SD 0.24) and 68 (SD 18.0) for patients undergoing TKA. In addition, the mean SF12 PCS score was 32 (SD 9.4 and 9.1, respectively) in both groups (table 3).
feasibility of collecting multiple PROMs
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