Maximilian Jörgens1, Alexander M Keppler2, Philipp Ahrens3, Wolf Christian Prall4, Marcel Bergstraesser5, Andreas T Bachmeier2, Christian Zeckey6, Adrian Cavalcanti Kußmaul2, Wolfgang Böcker2, Julian Fürmetz2,7. 1. Department of Orthopaedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Munich, Germany. maximilian.joergens@med.uni-muenchen.de. 2. Department of Orthopaedics and Trauma Surgery, Musculoskeletal University Center Munich (MUM), University Hospital, LMU Munich, Munich, Germany. 3. OrthoPlus Munich, Munich, Germany. 4. FIFA Medical Centre of Excellence, Division of Knee, Hip, Shoulder and Ellbow Surgery, Schoen Clinic Munich, Munich, Germany. 5. OT Medizintechnik GmbH (Medical Engineering in Orthopedics and Traumatology), Munich, Germany. 6. Department of Trauma Surgery and Orthopaedics, RoMed Klinikum Rosenheim, Rosenheim, Germany. 7. Department of Trauma Surgery, BG Unfallklinikum Murnau, Murnau, Germany.
Abstract
PURPOSE: Three-dimensional (3D) printed patient-specific instruments (PSI) have been introduced to increase precision and simplify surgical procedures. Initial results in femoral and tibial osteotomies are promising, but validation studies on 3D planning, manufacturing of patient-specific cutting blocks and 3D evaluation of the attained results are lacking. METHODS: In this study, patient-specific cutting blocks and spacers were designed, fabricated, and used to perform a high tibial osteotomy (HTO). After segmentation of CT data sets from 13 human tibiae, 3D digital planning of the HTO was performed with a medial opening of 8 mm. These 3D models were used to fabricate patient-specific cutting blocks and spacers. After the surgical procedure, accuracy was evaluated measuring 3D joint angles and surface deviations. RESULTS: The lowest mean deviation was found to be 0.57° (SD ± 0.27) for the MPTA. Medial and lateral tibial slope deviated from the 3D planning by an average of 0.98° (SD ± 0.53) and 1.26° (SD ± 0.79), respectively, while tibial torsion deviated by an average of 5.74° (SD ± 3.24). Color analysis of surface deviations showed excellent and good agreement in 7 tibiae. CONCLUSION: With 3D cutting blocks and spacers, the 3D planning of the HTO can be translated into reality with small deviations of the resulting joint angles. Within this study, the results of the individual steps are examined for errors and thus a critical evaluation of this new and promising method for performing patient-specific HTOs is presented.
PURPOSE: Three-dimensional (3D) printed patient-specific instruments (PSI) have been introduced to increase precision and simplify surgical procedures. Initial results in femoral and tibial osteotomies are promising, but validation studies on 3D planning, manufacturing of patient-specific cutting blocks and 3D evaluation of the attained results are lacking. METHODS: In this study, patient-specific cutting blocks and spacers were designed, fabricated, and used to perform a high tibial osteotomy (HTO). After segmentation of CT data sets from 13 human tibiae, 3D digital planning of the HTO was performed with a medial opening of 8 mm. These 3D models were used to fabricate patient-specific cutting blocks and spacers. After the surgical procedure, accuracy was evaluated measuring 3D joint angles and surface deviations. RESULTS: The lowest mean deviation was found to be 0.57° (SD ± 0.27) for the MPTA. Medial and lateral tibial slope deviated from the 3D planning by an average of 0.98° (SD ± 0.53) and 1.26° (SD ± 0.79), respectively, while tibial torsion deviated by an average of 5.74° (SD ± 3.24). Color analysis of surface deviations showed excellent and good agreement in 7 tibiae. CONCLUSION: With 3D cutting blocks and spacers, the 3D planning of the HTO can be translated into reality with small deviations of the resulting joint angles. Within this study, the results of the individual steps are examined for errors and thus a critical evaluation of this new and promising method for performing patient-specific HTOs is presented.
Authors: J Robert Giffin; Tracy M Vogrin; Thore Zantop; Savio L Y Woo; Christopher D Harner Journal: Am J Sports Med Date: 2004-03 Impact factor: 6.202
Authors: Stefano Zaffagnini; Giacomo Dal Fabbro; Claudio Belvedere; Alberto Leardini; Silvio Caravelli; Gian Andrea Lucidi; Piero Agostinone; Massimiliano Mosca; Maria Pia Neri; Alberto Grassi Journal: J Clin Med Date: 2022-09-27 Impact factor: 4.964