To determine if there are long-term effects of a self-management intervention guided by self-regulation theory for adults with knee osteoarthritis at 6 and 12 months after completing the intervention.
This long-term follow-up study used a longitudinal quasi-experimental design with repeated measures.
A convenience sample of 127 patients with knee osteoarthritis who were 45 to 64 years of age were recruited from outpatient clinics in Taiwan. The Self-Management Needs of Knee Osteoarthritis Scale was used to assess self-management needs at enrollment (baseline). To evaluate the long-term effects, participants were reassessed at 6 and 12 months after the intervention using the following questionnaires: The Knee Injury and Osteoarthritis Outcome Score, Healthcare Outcomes, and the Short-Form Health Survey. Generalized estimating equations compared assessments at baseline with scores at 6 and 12 months following completion of the intervention. Multiple regression was used to examine significant factors associated with the assessments.
Participants had moderate levels of self-management needs. When assessments at 6 months were compared with baseline, scores for knee symptoms and physical function and quality of life showed significant improvements; significant reductions were seen in body mass index, unplanned medical consultations, and pain medication doses. Assessments at 12 months compared with baseline measures indicated these improvements were maintained. These improvements were significant from baseline measures at both 6 months and 12 months after adjustments were made for time and other significant variables.
Clinical care of knee osteoarthritis that includes a self-regulation theory-based self-management intervention could provide long-term benefits to patients.
Twelve months after completion of the intervention, the significant improvements seen at 6 months were maintained. Our findings demonstrate that the self-management intervention had significant long-term effects on knee symptoms and physical function, body mass index and pain medication doses, and overall quality of life for patients with moderate self-management needs of knee osteoarthritis.