A mechanism-based proof of concept study on the effects of duloxetine in patients with painful knee osteoarthritis

Nadia Ammitzbøll, Lars Arendt-Nielsen, Davide Bertoli, Christina Brock, Anne Estrup Olesen, Andreas Kappel, Asbjørn Mohr Drewes, Kristian Kjær Petersen, Nadia Ammitzbøll, Lars Arendt-Nielsen, Davide Bertoli, Christina Brock, Anne Estrup Olesen, Andreas Kappel, Asbjørn Mohr Drewes, Kristian Kjær Petersen

Abstract

Background: The global burden of osteoarthritis (OA) is steadily increasing due to demographic and lifestyle changes. The nervous system can undergo peripheral and central neuroplastic changes (sensitization) in patients with OA impacting the options to manage the pain adequately. As a result of sensitization, patients with OA show lower pressure pain thresholds (PPTs), facilitated temporal summation of pain (TSP), and impaired conditioned pain modulation (CPM). As traditional analgesics (acetaminophen and non-steroidal anti-inflammatory drugs) are not recommended for long-term use in OA, more fundamental knowledge related to other possible management regimes are needed. Duloxetine is a serotonin-noradrenalin reuptake inhibitor, and analgesic effects are documented in patients with OA although the underlying fundamental mechanisms remain unclear. The descending pain inhibitory control system is believed to be dependent on serotonin and noradrenalin. We hypothesized that the analgesic effect of duloxetine could act through these pathways and consequently indirectly reduce pain and sensitization. The aim of this mechanistic study is to investigate if PPTs, TSP, CPM, and clinical pain parameters are modulated by duloxetine.

Methods: This proof of concept study is a randomized, placebo-controlled, double-blinded, crossover trial, which compares PPTs, TSP, and CPM before and after 18 weeks of duloxetine and placebo in forty patients with knee OA. The intervention periods include a titration period (2 weeks), treatment period (60 mg daily for 14 weeks), and a discontinuation period (2 weeks). Intervention periods are separated by 2 weeks.

Discussion: Duloxetine is recommended for the treatment of chronic pain, but the underlying mechanisms of the analgesic effects are currently unknown. This study will investigate if duloxetine can modify central pain mechanisms and thereby provide insights into the underlying mechanisms of the analgesic effect.

Trial registration: ClinicalTrials.gov NCT04224584 . Registered on January 6, 2020. EudraCT 2019-003437-42 . Registered on October 22, 2019. The North Denmark Region Committee on Health Research Ethics N-20190055. Registered on October 31, 2019.

Keywords: Chronic pain; Duloxetine; Osteoarthritis; Quantitative sensory testing.

Conflict of interest statement

The authors declare that they have no competing interests.

© 2021. The Author(s).

Figures

Fig. 1
Fig. 1
Study design and timeline. Patients are randomized to either duloxetine followed by placebo (sequence 1) or placebo followed by duloxetine (sequence 2). Approximate dates for each study event (visits or phone calls) are highlighted in the timeline. Abbreviations: DLX, duloxetine; PBO, placebo; QD, daily dose
Fig. 2
Fig. 2
A Standard Protocol Items: Recommendations for Interventional Trials (SPIRIT) schematic diagram of the interventions and assessments in the trial

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