Unlabelled: Osteoarthritis (OA) pain is most commonly characterized by movement-triggered joint pain. However, in advanced disease, OA pain becomes persistent, ongoing and resistant to treatment with nonsteroidal anti-inflammatory drugs (NSAIDs). The mechanisms underlying ongoing pain in advanced OA are poorly understood. We recently showed that intra-articular (i.a.) injection of monosodium iodoacetate (MIA) into the rat knee joint produces concentration-dependent outcomes. Thus, a low dose of i.a. MIA produces NSAID-sensitive weight asymmetry without evidence of ongoing pain and a high i.a. MIA dose produces weight asymmetry and NSAID-resistant ongoing pain. In the present study, palpation of the ipsilateral hind limb of rats treated 14 days previously with high, but not low, doses of i.a. MIA produced expression of the early oncogene, FOS, in the spinal dorsal horn. Inactivation of descending pain facilitatory pathways using a microinjection of lidocaine within the rostral ventromedial medulla induced conditioned place preference selectively in rats treated with the high dose of MIA. Conditioned place preference to intra-articular lidocaine was blocked by pretreatment with duloxetine (30 mg/kg, intraperitoneally at -30 minutes). These observations are consistent with the likelihood of a neuropathic component of OA that elicits ongoing, NSAID-resistant pain and central sensitization that is mediated, in part, by descending modulatory mechanisms. This model provides a basis for exploration of underlying mechanisms promoting neuropathic components of OA pain and for the identification of mechanisms that might guide drug discovery for treatment of advanced OA pain without the need for joint replacement.
Perspective: Difficulty in managing advanced OA pain often results in joint replacement therapy in these patients. Improved understanding of mechanisms driving NSAID-resistant ongoing OA pain might facilitate development of alternatives to joint replacement therapy. Our findings suggest that central sensitization and neuropathic features contribute to NSAID-resistant ongoing OA joint pain.
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http://dx.doi.org/10.1016/j.jpain.2015.12.001 | DOI Listing |
BMC Pregnancy Childbirth
January 2025
Department of Women's and Children's Health, Uppsala University, Uppsala, 751 85, Sweden.
Background: Stillbirth occurs at a rate of 3.0 per thousand in Sweden. However, few studies have focused on the initial experiences of parents facing a stillbirth.
View Article and Find Full Text PDFJMIR Res Protoc
December 2024
Department of Molecular Pathobiology and Cell Adhesion Biology, Mie University Graduate School of Medicine, Tsu, Japan.
Background: Pain inhibits rehabilitation. In rehabilitation at medical institutions, the usefulness of virtual reality (VR) has been reported in many cases to alleviate pain. In recent years, the demand for home rehabilitation has increased.
View Article and Find Full Text PDFBreast
December 2024
Breast Cancer Center, Hospital Zambrano Hellion TecSalud, Tecnologico de Monterrey, San Pedro Garza García, Mexico; MILC, Médicos e Investigadores en la Lucha contra el Cáncer de Mama, Ciudad De México, Mexico. Electronic address:
Introduction: Cancer treatments have a detrimental impact on the quality of life (QoL) of young women with breast cancer (YWBC). Research exploring QoL trajectories has been mostly centered on postmenopausal women. Here we report longitudinal changes across all QoL domains and associated factors in YWBC.
View Article and Find Full Text PDFEur J Radiol
December 2024
Department of Radiology, University Hospital, LMU Munich, Marchioninistr. 15, D-81377 Munich, Germany.
Objectives: To evaluate the influence of clinical and procedural factors, particularly the thickness of reactive sclerosis, on clinical outcome of MR-guided high-intensity focused ultrasound (MR-HIFU) for the treatment of symptomatic osteoid osteomas (OO) of the extremities.
Materials And Methods: 18 consecutive patients (median age 19.5y) with symptomatic OO of the extremities eligible for MR-HIFU were enrolled in this ongoing prospective study (German Clinical Trials Register; nr.
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