Knee Injection on Coumadin AND Plavix

What are your thoughts on doing an intra articular knee injection on a patient on Coumadin and plavix concurrently. The patient's INR is on the low therapeutic range. I've found a lot of evidence that says its safe to do joint injections on coumadin, if the patient's INR is therapeutic, but couldn't find anything specifically about coumadin and plavix together. Any sources/references/practical advice would be appreciated. Thanks.
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums