Guoyan Zheng1, Hagen Hommel2, Alper Akcoltekin3, Benedikt Thelen3, Jan Stifter4, Geert Peersman5. 1. Institute for Surgical Technology and Biomechanics, University of Bern, Bern, Switzerland. guoyan.zheng@istb.unibe.ch. 2. Clinic for Orthopedic, Sports Medicine and Rehabilitation, Krankenhaus Mrkisch Oderland GmbH, Wriezen, Germany. 3. Institute for Surgical Technology and Biomechanics, University of Bern, Bern, Switzerland. 4. Medivation AG, Brugg, Switzerland. 5. Institute for Orthopaedic Research and Training, KU Leuven, Campus Pellenberg, Louvain, Belgium.
Abstract
PURPOSE: To present a clinical validation of a novel technology called "3X" which allows for 3D prosthesis planning and treatment evaluation in total knee arthroplasty (TKA) using only 2D X-ray radiographs. MATERIALS AND METHODS: After local institution review board approvals, 3X was evaluated on 43 cases (23 for preoperative planning and 20 for postoperative treatment evaluation). All the patients underwent CT scans according to a standard protocol. The results measured on the CT data were regarded as the ground truth. Additionally, two X-ray images were acquired for each affected leg and were used by 3X technology to derive patient-specific measurements of the leg. In total, we compared seven parameters for planning TKA and five parameters for postoperative prosthesis alignment. RESULTS: Our experimental results demonstrated that the mean distances between the surface models reconstructed from 2D X-rays and the associated surface models obtained from 3D CT data were smaller than 1.5 mm. The average differences for all angular parameters were smaller than [Formula: see text]. In over 78% cases 3X technology derived the same femoral component size as the CT-based ground truth and this value went down to 70% when 3X technology was used to predict the size of tibial component. CONCLUSION: 3X is a technology that allows for true 3D preoperative planning and postoperative treatment evaluation based on 2D X-ray radiographs.
PURPOSE: To present a clinical validation of a novel technology called "3X" which allows for 3D prosthesis planning and treatment evaluation in total knee arthroplasty (TKA) using only 2D X-ray radiographs. MATERIALS AND METHODS: After local institution review board approvals, 3X was evaluated on 43 cases (23 for preoperative planning and 20 for postoperative treatment evaluation). All the patients underwent CT scans according to a standard protocol. The results measured on the CT data were regarded as the ground truth. Additionally, two X-ray images were acquired for each affected leg and were used by 3X technology to derive patient-specific measurements of the leg. In total, we compared seven parameters for planning TKA and five parameters for postoperative prosthesis alignment. RESULTS: Our experimental results demonstrated that the mean distances between the surface models reconstructed from 2D X-rays and the associated surface models obtained from 3D CT data were smaller than 1.5 mm. The average differences for all angular parameters were smaller than [Formula: see text]. In over 78% cases 3X technology derived the same femoral component size as the CT-based ground truth and this value went down to 70% when 3X technology was used to predict the size of tibial component. CONCLUSION: 3X is a technology that allows for true 3D preoperative planning and postoperative treatment evaluation based on 2D X-ray radiographs.
Authors: N Baka; B L Kaptein; M de Bruijne; T van Walsum; J E Giphart; W J Niessen; B P F Lelieveldt Journal: Med Image Anal Date: 2011-05-04 Impact factor: 8.545
Authors: Eduard J De Valk; Julia C A Noorduyn; Eduard L A R Mutsaerts Journal: Knee Surg Sports Traumatol Arthrosc Date: 2016-09-21 Impact factor: 4.342