Predicting Errors in Offset Templating for Total Hip Arthroplasty
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Predicting Errors in Offset Templating for Total Hip Arthroplasty
taken in neutral, 20 degrees of internal rotation, and 20 degrees of external ... Even a conscientious positioning effort by the radiology technician may not fully ...
Poster 59 April 27-29, 2012, Coronado, California
Predicting Errors in Offset Templating for Total Hip Arthroplasty By: 1,2 Del Schutte, M.D., William R. Barfield Ph.D.1, Jeffrey Conrad, M.D.1, Neil Romero, M.D.1, Timothy McTighe, Dr. H.S. (hc)2 & Ed McPherson, M.D.2,3
Goal:
Statistical Methods:
The goal of our study was to assess the role that rotation of the femur plays in changing the magnitude of femoral offset measured in a cadaver femur model. We hypothesized that traditional AP radiographs taken in neutral, 20 degrees of internal rotation, and 20 degrees of external rotation would alter femoral offset distance. Offset was measured as the horizontal distance between the center of the femoral head and the proximal border of the greater trochanter in millimeters by four senior level orthopaedic residents and three orthopaedic surgery faculty members.
A general linear model (GLM) was used to analyze variation in raters and rotation between neutral, 20 degrees of internal rotation (IR), and 20 degrees of external rotation (ER). Offset was chosen as the dependent variable. The independent variables were bone number (1-10), rater (1-7), and position (IR, ER). The a priori alpha level was set at p
