title: Factors that can predict pain with walking, 12 months after total knee arthroplasty.
abstract: Background and purpose - Functional limitations after total knee arthroplasty (TKA) are common. In this longitudinal study, we wanted to identify subgroups of patients with distinct trajectories of pain-related interference with walking during the first year after TKA and to determine which demographic, clinical, symptom-related, and psychological characteristics were associated with being part of this subgroup. Patients and methods - Patients scheduled for primary TKA for osteoarthritis (n = 202) completed questionnaires that evaluated perception of pain, fatigue, anxiety, depression, and illness on the day before surgery. Clinical characteristics were obtained from the medical records. Interference of pain with walking was assessed preoperatively, on postoperative day 4, and at 6 weeks, 3 months, and 12 months after TKA. Results - Using growth mixture modeling, 2 subgroups of patients were identified with distinct trajectories of pain-related interference with walking over time. Patients in the Continuous Improvement class (n = 157, 78%) had lower preoperative interference scores and reported a gradual decline in pain-related interference with walking over the first 12 months after TKA. Patients in the Recurrent Interference class (n = 45, 22%) reported a high degree of preoperative pain-related interference with walking, initial improvement during the first 3 months after TKA, and then a gradual increase-returning to preoperative levels at 12 months. Patients in the Recurrent Interference class had higher preoperative pain, fatigue, and depression scores, and poorer perception of illness than the Continuous Improvement class. Interpretation - 1 in 5 patients did not improve in pain-related interference with walking at 12 months after TKA. Future studies should test the efficacy of interventions designed to modify preoperative characteristics.
authors.affiliation: a Department of Surgery , Lovisenberg Diakonale Hospital , Oslo.|b Department of Nursing Science, Institute of Health and Society, Faculty of Medicine , University of Oslo , Oslo , Norway.
authors.forename: Maren Falch
authors.initials: MF
authors.lastname: Lindberg
authors.affiliation: c School of Nursing , University of California , San Francisco , CA , USA.
authors.forename: Christine
authors.initials: C
authors.lastname: Miaskowski
authors.affiliation: b Department of Nursing Science, Institute of Health and Society, Faculty of Medicine , University of Oslo , Oslo , Norway.|d Department of Research and Development, Division of Emergencies and Critical Care , Oslo University Hospital , Oslo , Norway.
authors.forename: Tone
authors.initials: T
authors.lastname: RustøEn
authors.affiliation: d Department of Research and Development, Division of Emergencies and Critical Care , Oslo University Hospital , Oslo , Norway.|e Institute of Clinical Medicine, University of Oslo , Oslo , Norway.
authors.forename: Leiv Arne
authors.initials: LA
authors.lastname: Rosseland
authors.affiliation: c School of Nursing , University of California , San Francisco , CA , USA.
authors.forename: Bruce A
authors.initials: BA
authors.lastname: Cooper
authors.affiliation: a Department of Surgery , Lovisenberg Diakonale Hospital , Oslo.|b Department of Nursing Science, Institute of Health and Society, Faculty of Medicine , University of Oslo , Oslo , Norway.
authors.forename: Anners
authors.initials: A
authors.lastname: Lerdal
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000503:physiopathology / Q000601:surgery*; D010147:Pain Measurement; D010149:Postoperative Pain / Q000453:epidemiology / Q000209:etiology* / Q000503:physiopathology; D020127:Recovery of Function; D012189:Retrospective Studies; D011795:Surveys and Questionnaires; D013997:Time Factors; D016896:Treatment Outcome; D016138:Walking / Q000502:physiology*