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Thursday, October 7, 2010, 7:30-8:20Session B1: Computer Navigation in TKAThe Role of Selective Femoral Navigation in Restoring the Mechanical AxisPost TKR*Nilen Shah - Bombay Hospital - Mumbai, IndiaAbhijit Adsul - Bombay hospital - Mumbai, India*Email: drnilen@gmail.comBackground Computer navigation is increasingly being recognized as a valuable tool inrestoring the mechanical axis post TKR. Its use is as yet not universal due to the costs involved,its availability and the fact that it can be cumbersome and time consuming to use. Additionallyit requires the insertion of Schanz pins in the femur as well as the tibia which can be a matter ofconcern as regards stress fracture and infection. However, it is able to reliably locate the centerof the femoral head which is an elusive landmark in the standard method. The center of theankle involves registration for the medial and lateral malleoli which are subcutaneous andeasily palpable. We decided to navigate only the distal femoral cut with a specializednavigation unit called Articular Surface Mounted navigation which does not require theinsertion of additional pins through the femur or the tibia . We purposely did not use navigationfor the rest of the bony cuts as all the other landmarks i.e. femoral epicondyles, tibial malleoli,and tuberosity etc are all easily palpable. This dramatically reduced the surgical time andincreased its user friendliness. We are presenting our results.Aim: To analyse the radiographic results obtained with selective femoral navigation andcompare with1.) standard navigational results from the literature2.) Non-navigated Knees form personal series.Materials and MethodsWe have utilized the ASM navigation for distal femoral cut in 112 knees and obtained long X-rays ( scanograms ) and routine knee X-rays (AP, Lateral and skyline ) to study the mechanicalfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]