Abstract
Purpose
182 AMIS Total Hip Replacements were analysed for implant placement using the IMATRI system to evaluate the accuracy of the minimal invasive technique. These hips were done in two different periods to assess if the measurement and analyses of the implant placement improved over time.
Methods
182 Consecutive AMIS Total Hip Replacements were performed during two different periods. Postoperative X-rays were done on all cases in the recovery room and the images were all uploaded to the IMATRI system. Leg length discrepancy, acetabular cup inclinations and anteversion were measured using predetermined morphing systems. Data were then analysed to define accuracy of implant placement. Outliers were also analysed to explain possible reasons.
Summary
70% of the cases had leg lengths within 5mm of the opposite hip with range of −9 to +25 mm leg length difference. Acetabular cup anteversion varied from 5° to 30° with 72% between 10° and 20° anteversion. Acetabular cup inclination varied from 27° to 58° with 87% between 35° and 55°. Implant positioning improved during the second period, especially in the degree of anteversion with 77% of prosthesis between 5° and 25°deg anteversion.
NO DISCLOSURES
