SciCombinator

Discover the most talked about and latest scientific content & concepts.

Concept: Osteoarthritis

167

BACKGROUND: Knee osteoarthritis is the most common type of arthritis, with pain being its most common symptom. Little is known about the psychological aspects of knee osteoarthritis pain. There is an emerging consensus among osteoarthritis specialists about the importance of addressing not only biological but also psychosocial factors in the assessment and treatment of osteoarthritis. As few studies have evaluated the effect of psychological interventions on knee osteoarthritis pain, good quality randomized controlled trials are needed to determine their effectiveness. METHODS: We intend to conduct a 6-week single-blinded randomized controlled trial with a 12-month follow-up. Altogether, 108 patients aged from 35 to 75 years with clinical symptoms and radiographic grading (KL 2–4) of knee osteoarthritis will be included. The clinical inclusion criteria are pain within the last year in or around the knee occurring on most days for at least one month, and knee pain of >=40 mm on a 100-mm visual analogue scale in the WOMAC pain subscale for one week prior to study entry. Patients with any severe psychiatric disorder, other back or lower limb pain symptoms more aggravating than knee pain, or previous or planned lower extremity joint surgery will be excluded. The patients will be randomly assigned to a combined GP care and cognitive-behavioral intervention group (n = 54) or to a GP care control group (n = 54). The cognitive-behavioral intervention will consist of 6 weekly group sessions supervised by a psychologist and a physiotherapist experienced in the treatment of pain. The main goals of the intervention are to reduce maladaptive pain coping and to increase the self-management of pain and disability. The follow-up-points will be arranged at 3 and 12 months. The primary outcome measure will be the WOMAC pain subscale. Secondary outcome measures will include self-reports of pain and physical function, a health related quality of life questionnaire, and various psychological questionnaires. Personnel responsible of the data analysis will be blinded. DISCUSSION: This study addresses the current topic of non-pharmacological conservative treatment of knee OA-related pain. We anticipate that these results will provide important new insights to the current care recommendations.Trial registration: Current Controlled Trials ISRCTN64794760.

Concepts: Epidemiology, Clinical trial, Randomized controlled trial, Effectiveness, Osteoarthritis, Pharmaceutical industry, Clinical research, Clinical psychology

151

The aims of this study were to determine the survival of anatomic total shoulder arthroplasty with uncemented metal-backed (MB) glenoid components with a polyethylene (PE) insert in primary osteoarthritis, to assess the reasons for revision surgery, and to identify patients and diagnostic factors that influence failure rates.

Concepts: Medicine, Physician, Osteoarthritis, Hip replacement, Shoulder, Failure rate, Shoulder replacement, Scapula

150

To assess the effects of one intra-articular corticosteroid injection two weeks prior to an exercise-based intervention program for reducing pain sensitivity in patients with knee osteoarthritis (OA).

Concepts: Randomized controlled trial, Osteoarthritis, Corticosteroid, Cortisol, Knee, Joint, Pharmaceutical drug, Arthritis

140

To evaluate the effectiveness and safety of tocilizumab (TCZ) in patients with rheumatoid arthritis (RA) in clinical practice, establishing the optimized regimen and switching from intravenous (IV) to subcutaneous (SC) therapy.

Concepts: Clinical trial, Rheumatoid arthritis, Rheumatology, Osteoarthritis, Arthritis, Psoriatic arthritis

119

Stromal vascular fraction (SVF) can easily be obtained from a mini-lipoaspirate procedure of fat tissue and platelet rich plasma (PRP) can be obtained from peripheral blood. We evaluated the safety and preliminary efficacy of administering SVF and PRP intra-articularly into patients with osteoarthritis grade 1 and 2.

Concepts: Protein, Blood, Obesity, Lipoprotein, Osteoarthritis, Adipose tissue, Knee, Joint

105

Isolated chondral defects have a limited capacity to heal and predispose to the development of osteoarthritis. Current surgical management can be unpredictable in outcome. Improved understanding of the action of mesenchymal stem cells (MSCs) has seen renewed interest in their role in cartilage repair. A 26-year-old athlete presented with a post-traumatic, isolated patella chondral defect. The patient underwent an arthroscopy with removal of a chondral loose body. After failure to symptomatically improve 12 months following surgery, the patient received intra-articular autologous adipose-derived mesenchymal stem cell (ADMSC) therapy.

Concepts: Bone, Stem cell, Mesenchymal stem cell, Bone marrow, Stem cells, Osteoarthritis, Knee, Mesenchyme

89

Fibroblast-like synoviocytes (FLS) are a key cell-type involved in rheumatoid arthritis (RA) progression. We previously identified the KCa1.1 potassium channel (Maxi-K, BK, Slo 1, KCNMA1) as a regulator of FLS and that KCa1.1 inhibition reduces disease severity in RA animal models. However, systemic KCa1.1 block causes multiple side effects and in this study, we aimed to determine whether the KCa1.1 β1-3-specific venom peptide blocker iberiotoxin (IbTX) reduces disease severity in animal models of RA without inducing major side effects. We used immunohistochemistry to identify IbTX-sensitive KCa1.1 subunits in joints of rats with a model of RA. Patch clamp and functional assays were used to determine if IbTX can regulate FLS through targeting KCa1.1. We then tested the efficacy of IbTX in ameliorating disease in two rat models of RA. Finally, we determined if IbTX causes side-effects including incontinence or tremors in rats, compared to those treated with the small molecule KCa1.1 blocker paxilline. IbTX-sensitive subunits of KCa1.1 are expressed by FLS in joints of rats with experimental arthritis. IbTX inhibits KCa1.1 channels expressed by FLS from patients with RA and by FLS from rat models of RA and reduces FLS invasiveness. IbTX significantly reduces disease severity in two rat models of RA. Unlike paxilline, IbTX does not induce tremors or incontinence in rats. Overall, IbTX inhibits KCa1.1 channels on FLS and treats rat models of RA without inducing side effects associated with non-specific KCa1.1 blockade and could become the basis for the development of a new treatment for RA.

Concepts: Protein, Rheumatoid arthritis, Rheumatology, Ion channel, Osteoarthritis, Enzyme inhibitor, Arthritis, Scorpion

84

The term parachute trial entered the medical lexicon to depict studies of treatments everyone already assumes to be effective. (In other words, do we need a trial to show that parachutes save the lives of persons who jump from airplanes?(1)) The parachute trial has been invoked to decry randomized trials of total joint replacement as senseless. After all, joint replacements are among the most significant advances of the 20th century; don’t we already know they are successful? Nearly 1 million elective total knee and hip replacements are performed annually in the United States; rates of total knee replacement tripled . . .

Concepts: United States, Osteoarthritis, Hip replacement, Orthopedic surgery, 20th century, Joints, Knee replacement, Autologous chondrocyte implantation

78

Chondroitin sulfate 800 mg/day (CS) pharmaceutical-grade in the management of symptomatic knee osteoarthritis consistent with the European Medicines Agency guideline.

Concepts: Chondroitin sulfate, Cartilage, Osteoarthritis, Celecoxib, The Europeans, Food and Drug Administration

71

Obesity is a risk factor for osteoarthritis (OA), the greatest cause of disability in the US. The impact of obesity on OA is driven by systemic inflammation, and increased systemic inflammation is now understood to be caused by gut microbiome dysbiosis. Oligofructose, a nondigestible prebiotic fiber, can restore a lean gut microbial community profile in the context of obesity, suggesting a potentially novel approach to treat the OA of obesity. Here, we report that - compared with the lean murine gut - obesity is associated with loss of beneficial Bifidobacteria, while key proinflammatory species gain in abundance. A downstream systemic inflammatory signature culminates with macrophage migration to the synovium and accelerated knee OA. Oligofructose supplementation restores the lean gut microbiome in obese mice, in part, by supporting key commensal microflora, particularly Bifidobacterium pseudolongum. This is associated with reduced inflammation in the colon, circulation, and knee and protection from OA. This observation of a gut microbiome-OA connection sets the stage for discovery of potentially new OA therapeutics involving strategic manipulation of specific microbial species inhabiting the intestinal space.

Concepts: Immune system, Inflammation, Gut flora, Asthma, Obesity, Rheumatoid arthritis, Osteoarthritis, Dietary fiber