Clinical trials

The goal of this clinical trial is to determine the efficacy and safety of intramuscular methylprednisolone in patients with hand osteoarthritis. The main question it aims to answer is what the difference is in hand pain 4 weeks after the first injection with methylplrednisolone. This main goal will be assessed in the first 16 weeks, the RCT phase. Researchers will compare 120mg methylprednisolone with 40mg methylprednisolone and placebo to see if there is a difference in hand pain after 4 weeks. Participants will be asked to visit the hospital for: * injection of the study material * ultrasound assessment * physical examination like joint assessments and grip strenght * examination of blood * x-ray of the hand In phase 2, from week 16 to 48, an open label phase focusing on treatment strategy and safety. In this phase all participants may receive intramuscular methylprednisolone on demand at the dosage of 120mg only if they fulfil the following conditions: hand pain \> 30mm on a VAS (0-100mm) and a minimum of 16 weeks interval between two consecutive injections. Therefore, a maximum of two injections could be received during this period. Irrespective of that, all participants will be followed-up until week 48 when the end-of-study visit will take place.

The goal of this clinical trial is to assess the effectiveness of a disease activity guided dose reduction strategy of Janus kinase inhibitor (JAKi) compared to disease activity guided JAKi continuation in patients with rheumatoid arthritis (RA), psoriatic arthritis (PsA) and axial spondyloarthritis (axSpA) who are in a state of low disease activity or remission while on JAKi. The main question it aims to answer is: Is a disease activity guided dose reduction strategy for JAKi not inferior in terms of efficacy compared to disease activity guided JAKi continuation in patients with RA/PsA/axSpA that are currently in a low disease activity/remission state? Researchers will compare a disease activity guided dose reduction strategy for JAKi to disease activity guided JAKi continuation in patients with RA/PsA/axSpA that are currently in a low disease activity/remission state to see if a disease activity guided dose reduction strategy for JAKi is not inferior in terms of efficacy compared to disease activity guided JAKi continuation. Participants will: * Follow a JAKi dose reduction strategy or will continue using JAKi in the same dose * Study (telemonitoring) visits are planned every 3 months * At every visit, patients are asked to complete patient-reported outcomes that assess daily functioning, health-related quality of life, pain, fatigue, productivity loss, medical consumption and medication adherence.

The goal of this clinical trial is to evaluate the effect of treatment with colchicine 0.5mg once daily as compared to placebo in patients with knee or hip osteoarthritis on the incidence of first occurrence of knee or hip replacement. The main question it aims to answer is: Does colchicine lower the number of knee or hip replacements in participants with osteoarthritis? Researchers will compare colchicine to a placebo (a look-alike substance that contains no drug) to see if colchicine works to treat osteoarthritis. Participants will: * take colchicine every day for 3 tot 4.5 years * visit the clinic every year for check-up and tests such as blood samples and x-rays * fill in questionnaires every 3 months