Chlorhexidine Versus Betadine in Preventing Colonization of Femoral Nerve Catheters After Total Joint Arthroplasty (TJA)

After antisepsis four different cultures will be analyzed: 1. The femoral nerve catheter will be removed after 48 hours and a culture of the distal tip of the femoral nerve catheter will be performed between the 2 arms. 2. immediately before skin antisepsis, a culture of the the skin will be performed to identify baseline skin flora. 3. immediately after antisepsis with both betadine and chlorhexidine, a culture of the skin will be performed to assess antiseptic efficacy. 4. just prior to removal of the femoral nerve catheter, a culture of the skin/catheter interface will be performed between the 2 arms.