Morton S, Chan O, Ghozlan A, Price J, Perry J, Morrissey D High volume image guided injections and structured rehabilitation in shoulder impingement syndrome: a retrospective study. Muscles Ligaments Tendons J. 2015 Oct 20;5(3):195-9. doi: 10.11138/mltj/
Wheeler PC, Mahadevan D, Bhatt R, Bhatia M A Comparison of Two Different High-Volume Image-Guided Injection Procedures for Patients With Chronic Noninsertional Achilles Tendinopathy: A Pragmatic Retrospective Cohort Study. J Foot Ankle Surg. 2016 Sep-Oct
Subacromial Injection of High Volume Versus Conventional Steroid Injection Guided by Ultrasound in Shoulder Pain. Randomized Controlled Trial
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.
