The Experts below are selected from a list of 642 Experts worldwide ranked by ideXlab platform
Jun Hashimoto - One of the best experts on this subject based on the ideXlab platform.
-
pre designed corrective Osteotomy Guide in total ankle arthroplasty for adjusting loading axis of whole lower extremities in rheumatoid arthritis cases
Orthopaedic Proceedings, 2018Co-Authors: Makoto Hirao, Tsuyoshi Murase, Hideki Tsuboi, S Akita, M Matsushita, Shiro Ohshima, Yukihiko Saeki, Jun HashimotoAbstract:When total ankle arthroplasty (TAA) is performed, although tibial Osteotomy is instructed to be perpendicular to long axis of tibia, there is no established index for the talar bone corrective Osteotomy. Then, we have been deciding the correction angle at the plan for adjustment of the loading axis through whole lower extremities. We studied 17 TAA cases with rheumatoid arthritis (RA). X-ray picture of hip to calcaneus view (hip joint to tip of the calcaneus) defined to show more approximated loading axis has been referred for the preoperative planning. Furthermore, the data of correction angle has been reflected to pre-designed custom-made surgical Guide. If soft tissue balance was not acceptable, malleolar sliding Osteotomy was added. The distance between the centre of ankle joint and the axis (preD) was measured (mm) preoperatively, and the distance between the centre of prosthesis and the axis (postD) was measured postoperatively. Next, the tilting angle between tibial and talar components (defined as...
-
pre designed corrective Osteotomy Guide in total ankle arthroplasty for adjusting loading axis of whole lower extremities in rheumatoid arthritis cases
Journal of Bone and Joint Surgery-british Volume, 2014Co-Authors: Makoto Hirao, Tsuyoshi Murase, Hideki Tsuboi, S Akita, M Matsushita, Shiro Ohshima, Yukihiko Saeki, Jun HashimotoAbstract:When total ankle arthroplasty (TAA) is performed, although tibial Osteotomy is instructed to be perpendicular to long axis of tibia, there is no established index for the talar bone corrective Osteotomy. Then, we have been deciding the correction angle at the plan for adjustment of the loading axis through whole lower extremities. We studied 17 TAA cases with rheumatoid arthritis (RA). X-ray picture of hip to calcaneus view (hip joint to tip of the calcaneus) defined to show more approximated loading axis has been referred for the preoperative planning. Furthermore, the data of correction angle has been reflected to pre-designed custom-made surgical Guide. If soft tissue balance was not acceptable, malleolar sliding Osteotomy was added. The distance between the centre of ankle joint and the axis (preD) was measured (mm) preoperatively, and the distance between the centre of prosthesis and the axis (postD) was measured postoperatively. Next, the tilting angle between tibial and talar components (defined as the index of prosthesis edge loading) were measured with X-rays during standing. Tibio Calcaneal (TC) angle was also measured pre and postoperatively. TC angle was significantly improved from 8.3±6.0° to 3.5±3.6° postoperatively (P=0.028). PreD was 12.9±9.6mm, and that was significantly improved to 4.8±6.3mm (postD) (P=0.006). Within 17 cases, 8 cases showed 0–1mm of postD, 4 cases showed 1–5mm of postD, remaining 5 cases concomitant subtalar fusion with severe valgus and varus hindfoot deformity showed over 8mm of postD. All of the 12 cases showing within 5mm of postD indicated within 13mm of preD. The tilting angle between components was 0.17±0.37° postoperatively. Taken together, pre-designed corrective talar Osteotomy based on preoperative planning using hip to calcaneus view was useful to adjust the mechanical axis for replaced ankle joint in RA cases. Furthermore, after surgery, the hip to calcaneus view was useful to evaluate post-operative mechanical axis of whole lower extremities.
Mahesh B. Mawale - One of the best experts on this subject based on the ideXlab platform.
-
development of customized implant and customized surgical Osteotomy Guide in ablative tumor surgery for accurate mandibular reconstruction
International Journal of Medical Robotics and Computer Assisted Surgery, 2020Co-Authors: Sandeep W. Dahake, Pranav S Sapkal, Ashutosh D Bagde, Subodh Daronde, Manish Kamble, Mahesh B. Mawale, Abhaykumar M Kuthe, Bhupesh SarodeAbstract:OBJECTIVES: The objective of this study was to provide the generalized methodology for design and development of a customized implant and customized surgical Osteotomy Guide (CSOG) for precise mandibular tumor resection and placement of a customized implant in ablative tumor surgery for accurate mandibular reconstruction. METHODS: Medical imaging technique, image processing, virtual surgical planning (VSP), biomedical computer-aided design (CAD), and rapid prototyping (RP) were used to develop CSOG and customized implant. A mock surgical test and an experimental analysis were performed on the biomodel (RP assisted diseased model) to check the effectiveness of the CSOG. RESULTS: The paired t test showed the statistically significant result with the use of CSOG as compared to the without using CSOG in ablative mandibular tumor surgery. CONCLUSIONS: A mock test and an experimental analysis proved that, the precise tumor resection and customized implant placement with minimal gap between bone-implant junctions in mandibular reconstruction using CSOG.
-
precision of customized surgical Osteotomy Guide csog in mandibular reconstruction with a customized implant
Rapid Prototyping Journal, 2019Co-Authors: Sandeep W. Dahake, Abhaykumar M Kuthe, Mahesh B. MawaleAbstract:This study aims to find the usefulness of the customized surgical Osteotomy Guide (CSOG) for accurate mandibular tumor resection for boosting the accuracy of prefabricated customized implant fixation in mandibular reconstructions.,In all, 30 diseased mandibular RP models (biomodels) were allocated for the study (for experimental group [n = 15] and for control group [n = 15]). To reconstruct the mandible with customized implant in the experimental group, CSOGs and in control group, no CSOG were used for accurate tumor resections. In control group, only preoperative virtual surgical planning (VSP) and reconstructed RP mandible model were used for the reference. Individually each patient’s preoperative mandibular reconstructions data of both the groups were superimposed to the preoperative VSP of respective patient by registering images with the non-surgical side of the mandible. In both the groups, 3D measurements were taken on the reconstructed side and compared the preoperative VSP and postoperative reconstructed mandible data. The sum of the differences between pre and postoperative data was considered as the total error. This procedure was followed for both the groups and compared the obtained error between the two groups using statistical analysis.,The use of CSOG for accurate tumor resection and exact implant fixation in mandibular reconstruction produced a smaller total error than without using CSOG.,The results showed that, benefits provided with the use of CSOG in mandibular reconstruction justified its use over the without using CSOG, even in free hand tumor resection using rotating burr.
-
finite element analysis of customized implant in mandibular reconstruction after tumor resection with and without using customized surgical Osteotomy Guide
International Journal of Medical Robotics and Computer Assisted Surgery, 2018Co-Authors: Sandeep W. Dahake, Sanket Kulkarni, Abhaykumar M Kuthe, Mahesh B. MawaleAbstract:Objectives The aim of this work was to compare different 12 cases (3 patients * 4 cases = 12 cases) with varying gaps between implant and bone by analyzing the effect of these gaps on implant and screws using FEM. Methods In each patient's case 1 using CSOG and in case 2, 3, and 4 without using CSOG tumor cutting was done. Hence in each patient zero gaps at case 1 and overcutting at case 2, 3, and 4 have obtained at different locations. Results FEM results reveal that in each patient's case 4 (maximum gap) was more susceptible to loosening of the screws due to higher strains (37%) and implant failure due to higher stress (28%) concentration under the same loading conditions when compared with case 1 (zero gap). Conclusions The study reveals that mandibular reconstruction with implant placement using CSOG can significantly enhance the stability and safety of the implant.
-
finite element analysis of customized implant in mandibular reconstruction after tumor resection with and without using customized surgical Osteotomy Guide
International Journal of Medical Robotics and Computer Assisted Surgery, 2018Co-Authors: Sandeep W. Dahake, Sanket Kulkarni, Abhaykumar M Kuthe, Mahesh B. MawaleAbstract:Objectives The aim of this work was to compare different 12 cases (3 patients * 4 cases = 12 cases) with varying gaps between implant and bone by analyzing the effect of these gaps on implant and screws using FEM. Methods In each patient's case 1 using CSOG and in case 2, 3, and 4 without using CSOG tumor cutting was done. Hence in each patient zero gaps at case 1 and overcutting at case 2, 3, and 4 have obtained at different locations. Results FEM results reveal that in each patient's case 4 (maximum gap) was more susceptible to loosening of the screws due to higher strains (37%) and implant failure due to higher stress (28%) concentration under the same loading conditions when compared with case 1 (zero gap). Conclusions The study reveals that mandibular reconstruction with implant placement using CSOG can significantly enhance the stability and safety of the implant.
Sandeep W. Dahake - One of the best experts on this subject based on the ideXlab platform.
-
development of customized implant and customized surgical Osteotomy Guide in ablative tumor surgery for accurate mandibular reconstruction
International Journal of Medical Robotics and Computer Assisted Surgery, 2020Co-Authors: Sandeep W. Dahake, Pranav S Sapkal, Ashutosh D Bagde, Subodh Daronde, Manish Kamble, Mahesh B. Mawale, Abhaykumar M Kuthe, Bhupesh SarodeAbstract:OBJECTIVES: The objective of this study was to provide the generalized methodology for design and development of a customized implant and customized surgical Osteotomy Guide (CSOG) for precise mandibular tumor resection and placement of a customized implant in ablative tumor surgery for accurate mandibular reconstruction. METHODS: Medical imaging technique, image processing, virtual surgical planning (VSP), biomedical computer-aided design (CAD), and rapid prototyping (RP) were used to develop CSOG and customized implant. A mock surgical test and an experimental analysis were performed on the biomodel (RP assisted diseased model) to check the effectiveness of the CSOG. RESULTS: The paired t test showed the statistically significant result with the use of CSOG as compared to the without using CSOG in ablative mandibular tumor surgery. CONCLUSIONS: A mock test and an experimental analysis proved that, the precise tumor resection and customized implant placement with minimal gap between bone-implant junctions in mandibular reconstruction using CSOG.
-
precision of customized surgical Osteotomy Guide csog in mandibular reconstruction with a customized implant
Rapid Prototyping Journal, 2019Co-Authors: Sandeep W. Dahake, Abhaykumar M Kuthe, Mahesh B. MawaleAbstract:This study aims to find the usefulness of the customized surgical Osteotomy Guide (CSOG) for accurate mandibular tumor resection for boosting the accuracy of prefabricated customized implant fixation in mandibular reconstructions.,In all, 30 diseased mandibular RP models (biomodels) were allocated for the study (for experimental group [n = 15] and for control group [n = 15]). To reconstruct the mandible with customized implant in the experimental group, CSOGs and in control group, no CSOG were used for accurate tumor resections. In control group, only preoperative virtual surgical planning (VSP) and reconstructed RP mandible model were used for the reference. Individually each patient’s preoperative mandibular reconstructions data of both the groups were superimposed to the preoperative VSP of respective patient by registering images with the non-surgical side of the mandible. In both the groups, 3D measurements were taken on the reconstructed side and compared the preoperative VSP and postoperative reconstructed mandible data. The sum of the differences between pre and postoperative data was considered as the total error. This procedure was followed for both the groups and compared the obtained error between the two groups using statistical analysis.,The use of CSOG for accurate tumor resection and exact implant fixation in mandibular reconstruction produced a smaller total error than without using CSOG.,The results showed that, benefits provided with the use of CSOG in mandibular reconstruction justified its use over the without using CSOG, even in free hand tumor resection using rotating burr.
-
finite element analysis of customized implant in mandibular reconstruction after tumor resection with and without using customized surgical Osteotomy Guide
International Journal of Medical Robotics and Computer Assisted Surgery, 2018Co-Authors: Sandeep W. Dahake, Sanket Kulkarni, Abhaykumar M Kuthe, Mahesh B. MawaleAbstract:Objectives The aim of this work was to compare different 12 cases (3 patients * 4 cases = 12 cases) with varying gaps between implant and bone by analyzing the effect of these gaps on implant and screws using FEM. Methods In each patient's case 1 using CSOG and in case 2, 3, and 4 without using CSOG tumor cutting was done. Hence in each patient zero gaps at case 1 and overcutting at case 2, 3, and 4 have obtained at different locations. Results FEM results reveal that in each patient's case 4 (maximum gap) was more susceptible to loosening of the screws due to higher strains (37%) and implant failure due to higher stress (28%) concentration under the same loading conditions when compared with case 1 (zero gap). Conclusions The study reveals that mandibular reconstruction with implant placement using CSOG can significantly enhance the stability and safety of the implant.
-
finite element analysis of customized implant in mandibular reconstruction after tumor resection with and without using customized surgical Osteotomy Guide
International Journal of Medical Robotics and Computer Assisted Surgery, 2018Co-Authors: Sandeep W. Dahake, Sanket Kulkarni, Abhaykumar M Kuthe, Mahesh B. MawaleAbstract:Objectives The aim of this work was to compare different 12 cases (3 patients * 4 cases = 12 cases) with varying gaps between implant and bone by analyzing the effect of these gaps on implant and screws using FEM. Methods In each patient's case 1 using CSOG and in case 2, 3, and 4 without using CSOG tumor cutting was done. Hence in each patient zero gaps at case 1 and overcutting at case 2, 3, and 4 have obtained at different locations. Results FEM results reveal that in each patient's case 4 (maximum gap) was more susceptible to loosening of the screws due to higher strains (37%) and implant failure due to higher stress (28%) concentration under the same loading conditions when compared with case 1 (zero gap). Conclusions The study reveals that mandibular reconstruction with implant placement using CSOG can significantly enhance the stability and safety of the implant.
Makoto Hirao - One of the best experts on this subject based on the ideXlab platform.
-
pre designed corrective Osteotomy Guide in total ankle arthroplasty for adjusting loading axis of whole lower extremities in rheumatoid arthritis cases
Orthopaedic Proceedings, 2018Co-Authors: Makoto Hirao, Tsuyoshi Murase, Hideki Tsuboi, S Akita, M Matsushita, Shiro Ohshima, Yukihiko Saeki, Jun HashimotoAbstract:When total ankle arthroplasty (TAA) is performed, although tibial Osteotomy is instructed to be perpendicular to long axis of tibia, there is no established index for the talar bone corrective Osteotomy. Then, we have been deciding the correction angle at the plan for adjustment of the loading axis through whole lower extremities. We studied 17 TAA cases with rheumatoid arthritis (RA). X-ray picture of hip to calcaneus view (hip joint to tip of the calcaneus) defined to show more approximated loading axis has been referred for the preoperative planning. Furthermore, the data of correction angle has been reflected to pre-designed custom-made surgical Guide. If soft tissue balance was not acceptable, malleolar sliding Osteotomy was added. The distance between the centre of ankle joint and the axis (preD) was measured (mm) preoperatively, and the distance between the centre of prosthesis and the axis (postD) was measured postoperatively. Next, the tilting angle between tibial and talar components (defined as...
-
pre designed corrective Osteotomy Guide in total ankle arthroplasty for adjusting loading axis of whole lower extremities in rheumatoid arthritis cases
Journal of Bone and Joint Surgery-british Volume, 2014Co-Authors: Makoto Hirao, Tsuyoshi Murase, Hideki Tsuboi, S Akita, M Matsushita, Shiro Ohshima, Yukihiko Saeki, Jun HashimotoAbstract:When total ankle arthroplasty (TAA) is performed, although tibial Osteotomy is instructed to be perpendicular to long axis of tibia, there is no established index for the talar bone corrective Osteotomy. Then, we have been deciding the correction angle at the plan for adjustment of the loading axis through whole lower extremities. We studied 17 TAA cases with rheumatoid arthritis (RA). X-ray picture of hip to calcaneus view (hip joint to tip of the calcaneus) defined to show more approximated loading axis has been referred for the preoperative planning. Furthermore, the data of correction angle has been reflected to pre-designed custom-made surgical Guide. If soft tissue balance was not acceptable, malleolar sliding Osteotomy was added. The distance between the centre of ankle joint and the axis (preD) was measured (mm) preoperatively, and the distance between the centre of prosthesis and the axis (postD) was measured postoperatively. Next, the tilting angle between tibial and talar components (defined as the index of prosthesis edge loading) were measured with X-rays during standing. Tibio Calcaneal (TC) angle was also measured pre and postoperatively. TC angle was significantly improved from 8.3±6.0° to 3.5±3.6° postoperatively (P=0.028). PreD was 12.9±9.6mm, and that was significantly improved to 4.8±6.3mm (postD) (P=0.006). Within 17 cases, 8 cases showed 0–1mm of postD, 4 cases showed 1–5mm of postD, remaining 5 cases concomitant subtalar fusion with severe valgus and varus hindfoot deformity showed over 8mm of postD. All of the 12 cases showing within 5mm of postD indicated within 13mm of preD. The tilting angle between components was 0.17±0.37° postoperatively. Taken together, pre-designed corrective talar Osteotomy based on preoperative planning using hip to calcaneus view was useful to adjust the mechanical axis for replaced ankle joint in RA cases. Furthermore, after surgery, the hip to calcaneus view was useful to evaluate post-operative mechanical axis of whole lower extremities.
Tsuyoshi Murase - One of the best experts on this subject based on the ideXlab platform.
-
pre designed corrective Osteotomy Guide in total ankle arthroplasty for adjusting loading axis of whole lower extremities in rheumatoid arthritis cases
Orthopaedic Proceedings, 2018Co-Authors: Makoto Hirao, Tsuyoshi Murase, Hideki Tsuboi, S Akita, M Matsushita, Shiro Ohshima, Yukihiko Saeki, Jun HashimotoAbstract:When total ankle arthroplasty (TAA) is performed, although tibial Osteotomy is instructed to be perpendicular to long axis of tibia, there is no established index for the talar bone corrective Osteotomy. Then, we have been deciding the correction angle at the plan for adjustment of the loading axis through whole lower extremities. We studied 17 TAA cases with rheumatoid arthritis (RA). X-ray picture of hip to calcaneus view (hip joint to tip of the calcaneus) defined to show more approximated loading axis has been referred for the preoperative planning. Furthermore, the data of correction angle has been reflected to pre-designed custom-made surgical Guide. If soft tissue balance was not acceptable, malleolar sliding Osteotomy was added. The distance between the centre of ankle joint and the axis (preD) was measured (mm) preoperatively, and the distance between the centre of prosthesis and the axis (postD) was measured postoperatively. Next, the tilting angle between tibial and talar components (defined as...
-
pre designed corrective Osteotomy Guide in total ankle arthroplasty for adjusting loading axis of whole lower extremities in rheumatoid arthritis cases
Journal of Bone and Joint Surgery-british Volume, 2014Co-Authors: Makoto Hirao, Tsuyoshi Murase, Hideki Tsuboi, S Akita, M Matsushita, Shiro Ohshima, Yukihiko Saeki, Jun HashimotoAbstract:When total ankle arthroplasty (TAA) is performed, although tibial Osteotomy is instructed to be perpendicular to long axis of tibia, there is no established index for the talar bone corrective Osteotomy. Then, we have been deciding the correction angle at the plan for adjustment of the loading axis through whole lower extremities. We studied 17 TAA cases with rheumatoid arthritis (RA). X-ray picture of hip to calcaneus view (hip joint to tip of the calcaneus) defined to show more approximated loading axis has been referred for the preoperative planning. Furthermore, the data of correction angle has been reflected to pre-designed custom-made surgical Guide. If soft tissue balance was not acceptable, malleolar sliding Osteotomy was added. The distance between the centre of ankle joint and the axis (preD) was measured (mm) preoperatively, and the distance between the centre of prosthesis and the axis (postD) was measured postoperatively. Next, the tilting angle between tibial and talar components (defined as the index of prosthesis edge loading) were measured with X-rays during standing. Tibio Calcaneal (TC) angle was also measured pre and postoperatively. TC angle was significantly improved from 8.3±6.0° to 3.5±3.6° postoperatively (P=0.028). PreD was 12.9±9.6mm, and that was significantly improved to 4.8±6.3mm (postD) (P=0.006). Within 17 cases, 8 cases showed 0–1mm of postD, 4 cases showed 1–5mm of postD, remaining 5 cases concomitant subtalar fusion with severe valgus and varus hindfoot deformity showed over 8mm of postD. All of the 12 cases showing within 5mm of postD indicated within 13mm of preD. The tilting angle between components was 0.17±0.37° postoperatively. Taken together, pre-designed corrective talar Osteotomy based on preoperative planning using hip to calcaneus view was useful to adjust the mechanical axis for replaced ankle joint in RA cases. Furthermore, after surgery, the hip to calcaneus view was useful to evaluate post-operative mechanical axis of whole lower extremities.
-
three dimensional corrective Osteotomy using a patient specific Osteotomy Guide and bone plate based on a computer simulation system accuracy analysis in a cadaver study
International Journal of Medical Robotics and Computer Assisted Surgery, 2014Co-Authors: Shinsuke Omori, Tsuyoshi Murase, Toshiyuki Kataoka, Yohei Kawanishi, Keiichiro Oura, Junichi Miyake, Hiroyuki Tanaka, Hideki YoshikawaAbstract:Background The accuracy of three-dimensional (3-D) corrective Osteotomy using a patient-specific Osteotomy Guide and bone plate based on computer simulation was investigated. Methods Six fresh-frozen cadaver upper limbs were used. A patient-specific Osteotomy Guide designed to realize a preplanned Osteotomy was set on the distal humerus and distal radius, and the error in the setting location was evaluated. After the Osteotomy, the surgical site was fixed using a patient-specific bone plate designed to exactly fit the anatomical shape of the postoperative bone model. The postoperative results were compared with the preoperative simulation. Results The errors in the Guide location on the humerus and radius were <1.5° and 1.0 mm and <1.0° and 1.0 mm, respectively. The plate fixation errors of the humerus and radius were <2.0° and 1.5 mm and <1.0° and 1.0 mm, respectively. Conclusions The system is sufficiently feasible to realize precise 3-D deformity correction of a limb. Copyright © 2013 John Wiley & Sons, Ltd.
