Error Measurement Between Anatomical Porcine Spine, CT Images, and 3D Printing

Gálvez, Marcelo; Montoya, Carlos; Fuentes, Jorge; Rojas, Gonzalo; Asahi, Takeshi; Currie, William; Kuflik, Mario; Chahin, Andrés

doi:10.1016/j.acra.2019.06.016

Cited by 11 publications

(8 citation statements)

References 21 publications

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“…After, the spines were isolated from L1 to L5 and prepared in a similar way, as described in previous studies 15 . A combination of gentle sharp dissection using a scalpel, curettes, and periosteal elevators were used to remove soft tissue.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of the contact surface between vertebral endplate and 3D printed patient-specific cage vs commercial cage

Fernandes

Gee

Kanawati

et al. 2022

Sci Rep

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Biomechanical study. To evaluate the performance of the contact surface for 3D printed patient-specific cages using CT-scan 3D endplate reconstructions in comparison to the contact surface of commercial cages. Previous strategies to improve the surface of contact between the device and the endplate have been employed to attenuate the risk of cage subsidence. Patient-specific cages have been used to help, but only finite-element studies have evaluated the effectiveness of this approach. There is a possible mismatch between the CT-scan endplate image used to generate the cage and the real bony endplate anatomy that could limit the performance of the cages. A cadaveric model is used to investigate the possible mismatch between 3D printed patient-specific cages and the endplate and compare them to commercially available cages (Medtronic Fuse and Capstone). Contact area and contact stress were used as outcomes. When PS cage was compared to the Capstone cage, the mean contact area obtained was 100 ± 23.6 mm2 and 57.5 ± 13.7 mm2, respectively (p < 0.001). When compared to the Fuse cage, the mean contact area was 104.8 ± 39.6 mm2 and 55.2 ± 35.1 mm2, respectively(p < 0.001). Patient-specific cages improve the contact area between the implant and the endplate surface, reducing the contact stress and the risk of implant subsidence during LIF surgeries.

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Section: Methodsmentioning

confidence: 99%

Evaluation of the contact surface between vertebral endplate and 3D printed patient-specific cage vs commercial cage

Fernandes

Gee

Kanawati

et al. 2022

Sci Rep

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“…A region of interest was created around each individual vertebra in question, with a spacing scale of 0.8 and isotropic spacing. Cropping the region of interest reduced the amount of data in the image, and improved computer processing times 7 . Reducing the spacing scale to 0.8, before starting segmentation, changes the segmentation node's internal binary label map and increases the resolution of subsequent models in the hope this would more accurately reflect finer bone details.…”

Section: Methodsmentioning

confidence: 99%

“…To assess the accuracy of each method, eight measurements were recorded for all model types (Figure 4). Several traditional measurements from previous similar reports 7 , 8 could not be assessed due to the exclusion of the vertebral bodies and transverse processes from the segmentation. The included measurements were as follows: the left and right vertebral height, spinous process length and height, right and left pedicle height and width.…”

Section: Methodsmentioning

confidence: 99%

“…In order to provide a direct comparison of the MRI-based models to the bone, the spines were isolated from T12 to sacrum, and cleaned in a similar fashion as described by Galvez et al 7 The bones were boiled for 5 h with dishwashing detergent to make the process of cleaning much more efficient. The use of detergent facilitated the breakdown of fats and other tissues.…”

Section: Soft Tissue Removalmentioning

confidence: 99%

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Geometric and volumetric relationship between human lumbar vertebrae and “Black‐bone” MRI‐based models

Kanawati

Fernandes

Gee

et al. 2021

Robotics Computer Surgery

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Background This study will examine the differences between human lumbar vertebrae, three‐dimensional (3D) scans of these bones, 3D models based on ‘Black‐bone’ magnetic resonance imaging (MRI) scans, and 3D‐printed models. Materials and Methods 3D mesh models were created from the “Black‐bone” MRI data from two cadaveric human spines, and then 3D printed. Four models were analysed and compared: anatomic bones, 3D‐scanned models, MRI models and 3D‐printed models. Results There was no significant difference between when comparing the average of all measurements between all model types (p = 0.81). The mean dice coefficient was 0.91 (SD 0.016) and the mean Hausdorff distance was 0.37 mm (SD 0.04 mm) when comparing the MRI model to the 3D‐scanned model. The mean volumes for the MRI model and the 3D scanned model were 10.42 and 10.04 ml (p = 0.085), respectively. Conclusions The ‘Black‐bone’ MRI could be a valid radiation‐free alternative to computed tomography for the 3D printing of lumbar spinal biomodels.

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“…[17][18][19] Nevertheless, an animal model can easily solve the ethical problems and frozen tissue inactivation, 20 and swine have proven to be an excellent alternative for practicing and simulating surgical strategies that cannot be performed on human cadavers. 21,22 Therefore, the primary purpose of this study was to evaluate the accuracy and repeatability of MRI VOI method by comparing the data measured by VOI with the actual forelimbs' muscle volumes of pigs. We hypothesized that the VOI method was accurate and reliable for measuring skeletal muscle volumes, and could provide a convenient and non-invasive way for clinical evaluation of sarcopenia or in orthopedics and sports medicine.…”

Section: Introductionmentioning

confidence: 99%

Semi-automatic 3-D Reconstruction Measurement of Muscle Volume with Magnetic Resonance Imaging

Zhou¹,

Hu²,

Yang³

et al. 2020

GlobalCE

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Background and Objective: We aimed to assess and verify the measurement accuracy and feasibility of semi-automatic magnetic resonance imaging (MRI) volume of interest (VOI) method by comparing its measurements with actual skeletal muscle volumes and discuss the clinical significance. Material and Methods: A total of 18 muscles from 2 pigs were measured by drainage method, VOI method (VVOI), the summation method (Vsum), and maximum section method (Vmax) respectively after MRI scanning. All measurements were performed by 2 musculoskeletal radiologists and repeated at 6 different times, recording the consuming time (minutes) of every muscle. The average result of the 2 radiologists was adopted. Results: The 3-D structure of the skeletal muscles was distinct and vivid. A Friedman test and the inter-class correlation coefficient (ICC) indicated the VOI method had a high intra- and inter-reliability. The root mean square error (RMSE) over 6 time-points was 1.101 mL. A Bland-Altman plot represented a superior consistency. Pairwise Mann–Whitney U testing demonstrated that the consuming time to measure each muscle by VOI method was short. Conclusions: The VOI method could semi-automatically display the 3-D reconstruct of the skeletal muscle clearly, conveniently, with a great accuracy, and high repeatability.

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Error Measurement Between Anatomical Porcine Spine, CT Images, and 3D Printing

Cited by 11 publications

References 21 publications

Evaluation of the contact surface between vertebral endplate and 3D printed patient-specific cage vs commercial cage

Evaluation of the contact surface between vertebral endplate and 3D printed patient-specific cage vs commercial cage

Geometric and volumetric relationship between human lumbar vertebrae and “Black‐bone” MRI‐based models

Semi-automatic 3-D Reconstruction Measurement of Muscle Volume with Magnetic Resonance Imaging

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