Summary: For patients who have arthroscopic knee surgery or casting of the lower leg, an approach of not administering prophylactic-dose low-molecular weight heparin (LMWH) appears to be associated with the same risks of deep-vein thrombosis (DVT) and pulmonary embolism (PE) as an approach of administering LWMH (for 8 days after arthroscopy or for the duration of casting), but without the added patient care burden of daily injections.

Strength of Recommendation = B