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Study shows WOMAC, SF12v2 PCS can detect clinically meaningful changes after TJA
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The WOMAC and SF12v2 physical component summary were useful in detecting clinically meaningful changes in patient-reported health status after total joint arthroplasty, according to study results.
Researchers collected patient-reported outcome measures preoperatively and 3 months postoperatively for 391 patients undergoing unilateral or bilateral primary total hip arthroplasty (THA) or primary total knee arthroplasty (TKA) who were enrolled in the California Joint Replacement Registry. The researchers analyzed SF12v2 physical component summary (PCS) and mental component summary (MCS) scores, total WOMAC scores and the University of California, Los Angeles (UCLA) activity score.
In both THA and TKA patients, results showed a statistically significant increase in postoperative scores for all patient-reported outcome measures with the exception of the SF12v2 MCS in patients undergoing TKA. The researchers found WOMAC scores had the highest responsiveness to postoperative change, as well as a high response to postoperative change in the mean SF12v2 PCS score. However, the UCLA activity score had moderate responsiveness, and the SF12v2 MCS score was poorly responsive to change, according to the researchers.
Nelson F. SooHoo
The researchers calculated a Minimal Clinically Important Difference (MCID) of 4.97 for the SF12v2 PCS, 5.11 for the SF12v2 MCS, 10.21 for the WOMAC and 0.92 for the UCLA Activity Score. Improvement greater than MCID was achieved in 69.9% of patients on the SF12v2 PCS and in 80.8% of patients on the WOMAC. Study results also showed improvement greater than MCID was achieved in 50.4% of patients in the UCLA Activity Score and in 33.8% of patients on the SF12v2 MCS.
According to bivariate analysis, patients undergoing THA were more likely to achieve improvement above the MCID vs. TKA patients, even after controlling for other patient factors using multivariable regression analyses for both the SF12v2 PCS and the WOMAC. – by Casey Tingle
Disclosures: SooHoo is an editorial board member of Orthopedics Today. Please see the full study for a list of all other authors’ relevant financial disclosures.
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