Gazeley DJ, Yeturi S, Patel PJ, Rosenthal AK Erosive osteoarthritis: A systematic analysis of definitions used in the literature. Semin Arthritis Rheum. 2017 Feb;46(4):395-403. doi: 10.1016/j.semarthrit.2016.08.013. Epub 2016 Aug 24. Review.
Gummesson C, Atroshi I, Ekdahl C The disabilities of the arm, shoulder and hand (DASH) outcome questionnaire: longitudinal construct validity and measuring self-rated health change after surgery. BMC Musculoskelet Disord. 2003 Jun 16;4:11. Epub 2003 Jun 16.
Kanat E, Alp A, Yurtkuran M Magnetotherapy in hand osteoarthritis: a pilot trial. Complement Ther Med. 2013 Dec;21(6):603-8. doi: 10.1016/j.ctim.2013.08.004. Epub 2013 Sep 8.
Spadoni GF, Stratford PW, Solomon PE, Wishart LR The evaluation of change in pain intensity: a comparison of the P4 and single-item numeric pain rating scales. J Orthop Sports Phys Ther. 2004 Apr;34(4):187-93.
Stark T, Walker B, Phillips JK, Fejer R, Beck R Hand-held dynamometry correlation with the gold standard isokinetic dynamometry: a systematic review. PM R. 2011 May;3(5):472-9. doi: 10.1016/j.pmrj.2010.10.025. Review.
Interventional studies are often prospective and are specifically tailored to evaluate direct impacts of treatment or preventive measures on disease.
Observational studies are often retrospective and are used to assess potential causation in exposure-outcome relationships and therefore influence preventive methods.
Expanded access is a means by which manufacturers make investigational new drugs available, under certain circumstances, to treat a patient(s) with a serious disease or condition who cannot participate in a controlled clinical trial.
Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.
Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.
