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dc.contributor.authorBihlet, A.R.
dc.contributor.authorByrjalsen, I.
dc.contributor.authorBay-Jensen, A.-C.
dc.date.accessioned2019-06-05T18:28:17Z
dc.date.available2019-06-05T18:28:17Z
dc.date.issued2018
dc.identifier.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85040768210&doi=10.1186%2fs12891-018-1938-5&partnerID=40&md5=a77676e65c48d478bb4b0efbd818c971
dc.identifier.urihttp://hdl.handle.net/10713/9437
dc.description.abstractBackground: Pain is the principal clinical symptom of osteoarthritis (OA), and development of safe and effective analgesics for OA pain is needed. Drug development of new analgesics for OA pain is impaired by substantial change in pain in patients receiving placebo, and more data describing clinical characteristics and pain categories particularly associated with this phenomenon is needed. The purpose of this post-hoc analysis was to investigate clinical characteristics and pain categories and their association with radiographic progression and placebo pain reduction (PPR) in OA patients as measured the Western Ontario and McMasters Arthritis (WOMAC). Methods: Pooled data from the placebo groups of two phase III randomized clinical trials in patients with knee OA followed for 2 years were analyzed. Differences between individual sub-scores and pain categories of weight-bearing and non-weight bearing pain over time were assessed. Selected patient baseline characteristics were assessed for association with PPR. Association between pain categories and radiographic progression was analyzed. Results: The reduction of pain in placebo-treated patients was significantly higher in the composite of questions related to weight-bearing pain compared to non-weight-bearing pain of the target knee. Baseline BMI, age and JSW were not associated with pain change. Pain reduction was higher in the Target knee, compared to the Non-Target knee at all corresponding time-points. A very weak correlation was found between weight-bearing pain and progression in the non-target knee. Conclusions: These results indicate that the reduction in pain in patients treated with placebo is significantly different between pain categories, as weight-bearing pain was significantly more reduced compared to non-weight-bearing pain. Further research in pain categories in OA is warranted. Trial Registration: NCT00486434 (trial 1) and NCT00704847 (trial 2) Copyright 2018 The Author(s).en_US
dc.description.urihttps://dx.doi.org/10.1186/s12891-018-1938-5en_US
dc.language.isoen-USen_US
dc.publisherBioMed Central Ltd.en_US
dc.relation.ispartofBMC Musculoskeletal Disorders
dc.subjectPain categoriesen_US
dc.subjectPlacebo-responseen_US
dc.subjectRadiographic progressionen_US
dc.titleIdentification of pain categories associated with change in pain in patients receiving placebo: Data from two phase 3 randomized clinical trials in symptomatic knee osteoarthritisen_US
dc.typeArticleen_US
dc.identifier.doi10.1186/s12891-018-1938-5
dc.identifier.pmid29343266


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