Convened under the auspicious of esteemed endorsers - ISTA

Introduction:Kevin Leffers - Memorial Bone and Joint Research Foundation - Houston, USA*Email: skreuzer@mbjc.netThe incorporation of computer navigation in total hip arthroplasty (THA) has been much slowerthen for total knee arthroplasty (TKA). Computer navigation has proven itself in the realm ofTKA but still has yet to advance in THA. The reasons for this include the lack of ease ofincorporation, accuracy and precision, and the addition of overall operative time. Anotherreason for this lack of progress is that a majority of THA’s are done with the patient in thelateral position through a posterior or lateral approach making the tracker placement and theregistration process somewhat cumbersome. In the direct anterior approach the patient is in thesupine position, which accommodates pelvic tracker placement and significantly facilitates theregistration process. At our institution we use the direct anterior approach and computernavigation on all of our primary THA’s. We hypothesized that computer navigation facilitatescup placement and leg length determination with out significantly increasing our operative time.Materials and Methods:This was a prospective study comparing a consecutive series of 150 computer navigated totalhips to a consecutive series of 150 none navigated total hips. The two groups were similar byage, sex, and BMI. Operative times were collected using our secure online database. The startand stop of operative time was incision to final reduction respectively. Post operativeradiographs were analyzed using TraumaCad 2.0 (Voyant Health, Columbia, MD). Cup angleand leg length were measured on A/P pelvic views. Simple descriptive statistics and t-testswere used to analyze data.Results:There were a total of 134 men and 166 women with a pre operative diagnosis of osteoarthritis.The conventional cohort contained 64 men and 86 women with an average age of 65.6 (26.1-91.3) and BMI of 29.3(15.7-50.9). The computer navigation cohort contained 70 men and 80women with an average age of 65.5 (44.8-90.2) and BMI of 28.6 (17.5-44.0). The averageoperative times of the conventional and computer navigation cohorts were 62.4 min (33-165)and 53.0 min (38-63) (p