Osteoarthritis — Varus Stem Positioning of a Cementless Anatomical THA. (VARABG)
Citation(s)
Khalily C, Lester DK Results of a tapered cementless femoral stem implanted in varus. J Arthroplasty. 2002 Jun;17(4):463-6.
Min BW, Song KS, Bae KC, Cho CH, Kang CH, Kim SY The effect of stem alignment on results of total hip arthroplasty with a cementless tapered-wedge femoral component. J Arthroplasty. 2008 Apr;23(3):418-23. doi: 10.1016/j.arth.2007.04.002. Epub 2007 Nov 9.
Reina N, Salib CG, Perry KI, Hanssen AD, Berry DJ, Abdel MP Mild Coronal Stem Malalignment Does Not Negatively Impact Survivorship or Clinical Results in Uncemented Primary Total Hip Arthroplasties With Dual-Tapered Implants. J Arthroplasty. 2019 Jun;34(6):1127-1131. doi: 10.1016/j.arth.2019.01.055. Epub 2019 Jan 31.
Varus Stem Positioning Does Not Affect Long-term Functional Outcome in Cementless Anatomical Total Hip Arthroplasty.
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.
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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.
