When i first started a few years ago my surgeon used lovenox for his knees for 14 days post-op and we used coumadin for his hip patients for 6 weeks post-op. We treat a big portion of medicare and DSHS pt's and we found compliance with lovenox for the knee pt had been poor do to the cost of the medication. Fortunately for us we have an anti-coag clinic in our building so we have gone to treating everyone across the board with coumadin. However the other surgeon is our practice still uses lovenox for the TKA's, and seems to do well with it.