This study investigates and compares the accuracy of pre-operative templating from the AP and lateral radiographs in total knee arthroplasty. Pre-operative radiographs from 478 patients undergoing primary total knee arthroplasty from September 2006 to April 2009 were reviewed. 154 had digital templating performed on both the AP and lateral radiograph The sizes templated for both the femoral and tibial components were recorded from the PACS archive. These were compared aginst the implanted femoral and tibial sizes taken from the theatre record. A Z-score for two proportions was used to determine the level of significance of any difference in accuracy between the AP and lateral views for each component.Introduction
Methods
One of the most important factors on which Total Knee Replacements results depend is accuracy of restoration of normal mechanical axis. It is believed that computer navigated TKR give better implants position therefore should improve long term results. We decided to check if computer navigation actually improves restoration of mechanical axis and implants placement in a single surgeon, single implant type series. We prospectively assessed 58 patients (60 knees). Each group (navigated versus non navigated) consisted of 30 knees. Patients were assessed clinically and radiographically using weight bearing full-length AP and short lateral films (PACS and IMPAX software). Clinical Results at 2 years were comparable in both groups (89% vs. 88% good or excellent result). Radiological results proved to be better in navigated knees regarding mechanical axis. There were no statistically important differences in other radiological parameters.
