Category: Orthopedics
Keywords: DVT, Leg, Cast (PubMed Search)
Posted: 12/31/2016 by Michael Bond, MD
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Take Home Point:
Low-molecular-weight heparin doesn't seem to prevent symptomatic venous thromboembolism (VTE) in patients undergoing knee arthroscopy or lower leg casting, suggest two trials in the New England Journal of Medicine.
The study was conducted by Dutch researcheers and randomized 1500 patients who underwent lower leg casting or knee arthoscopy to receive no anticoagulation or low molecular weight heparin. Patients were either treated for the entire duration of immobilzation or 8 days after their surgery (arthroscopy patients)
The rates of VTE in patients at 3 months of follow up where arthroscopy: 0.7% vs. 0.4%; casting: 1.4% vs. 1.8%. So overall very low rates of VTE, and no real difference between the groups.
A large cohort might have shown some benefit, but since the incidence is so low there is probably no reason to prophlactically treat these patients and increase their risk of major bleeding events, which was also low in the study.
The article can be found at http://www.nejm.org/doi/full/10.1056/NEJMoa1613303?query=pfw&jwd=000100949960&jspc=EM
van Adrichem RA, Nemeth B, Algra A, le Cessie S, Rosendaal FR, Schipper IB, et al. Thromboprophylaxis after Knee Arthroscopy and Lower-Leg Casting. N Engl J Med 2016.