Accuracy assessment of 3D bone reconstructions using CT: an intro comparison

Lalone, Emily A.; Willing, Ryan; Shannon, Hannah L.; King, Graham J.W.; Johnson, James A.

doi:10.1016/j.medengphy.2015.04.010

Cited by 46 publications

(23 citation statements)

References 17 publications

(26 reference statements)

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“…The 3D-printed PCL scaffold blocks were larger than the actual defect size and required some trimming before transplantation into the defect site. These results may be attributed to an error caused by distortions between the CT images and the actual structure that developed in the process of creating a 3D image based on the obtained data [ 31 , 32 ]. Further research will be needed to compensate for the size differences resulting from the common output errors and the differences between the CAD/CAM design and the final image utilized in the actual output for 3D bio-printing.…”

Section: Discussionmentioning

confidence: 99%

In Vivo Evaluation of 3D-Printed Polycaprolactone Scaffold Implantation Combined with β-TCP Powder for Alveolar Bone Augmentation in a Beagle Defect Model

et al. 2018

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Insufficient bone volume is one of the major challenges encountered by dentists after dental implant placement. This study aimed to evaluate the efficacy of a customized three-dimensional polycaprolactone (3D PCL) scaffold implant fabricated with a 3D bio-printing system to facilitate rapid alveolar bone regeneration. Saddle-type bone defects were surgically created on the healed site after extracting premolars from the mandibles of four beagle dogs. The defects were radiologically examined using computed tomography for designing a customized 3D PCL scaffold block to fit the defect site. After fabricating 3D PCL scaffolds using rapid prototyping, the scaffolds were implanted into the alveolar bone defects along with β-tricalcium phosphate powder. In vivo analysis showed that the PCL blocks maintained the physical space and bone conductivity around the defects. In addition, no inflammatory infiltrates were observed around the scaffolds. However, new bone formation occurred adjacent to the scaffolds, rather than directly in contact with them. More new bone was observed around PCL blocks with 400/1200 lattices than around blocks with 400/400 lattices, but the difference was not significant. These results indicated the potential of 3D-printed porous PCL scaffolds to promote alveolar bone regeneration for defect healing in dentistry.

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Section: Discussionmentioning

confidence: 99%

In Vivo Evaluation of 3D-Printed Polycaprolactone Scaffold Implantation Combined with β-TCP Powder for Alveolar Bone Augmentation in a Beagle Defect Model

et al. 2018

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“…All models were wrapped and smoothed within the Mimics 22.0 software, saved as stereolithography (STL) files, remeshed in 3-Matic (Materialise, Belgium), and converted to a different file format for ease of use in subsequent Python programs (visualization toolkit (VTK) files in Paraview (Kitware, Inc., New York 3 )). This method of reconstruction was validated previously where 3D reconstructions were created and compared to a ground truth bone digitization (average error <0.3 mm) [17]. Once models were complete, the lunate was classified by two types: type 1 lunates do not articulate with the hamate (n ¼ 2 in the young cohort; n ¼ 3 in the old cohort), while type 2 lunates do articulate with the hamate [18].…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Four-Dimensional Computed Tomography as a Technique for Quantifying Carpal Motion

Robinson

Straatman

Lee

et al. 2021

Journal of Biomechanical Engineering

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Delayed diagnosis of dynamic carpal instability often occurs because early changes in bone alignment and movement are difficult to detect and manifest mainly during a dynamic/functional task. Current diagnostic tools are only able to examine the carpal bones under static or sequential-static conditions. Four-dimensional (three dimensions + time) computed tomography (4DCT) enables quantification of carpal mechanics through 3D volume sequences of the wrist in motion. A comprehensive understanding of carpal mechanics is needed to define normal function and structure and provide targets for treatment of carpal injuries. In this study, measurements of scaphoid translation and joint congruency were taken by creating models from the CT scans of the carpals in extreme frames of motion, registering those models to the neutral position, transforming the models into a local coordinate system, and using software to calculate the joint surface areas (JSA). Results indicated that the centroid of the scaphoid translated 6.4 ± 1.3 mm and extended from extreme radial to extreme ulnar deviation. Results are consistent with the literature. An additional study was performed to measure the responsiveness of the 4DCT technique presented. Bone models from each frame of motion for radioulnar deviation (RUD) and flexion extension (FE) were created and distinct differences between their JSA were measured qualitatively and quantitatively. The results show that there was statistically significantly different JSA within carpal joints between RUD and FE. These studies provide the first step in developing the methodology when using 4DCT scanning to measure subtle abnormalities in the wrist.

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“…To obtain baseline data for measurements of cartilage, the cartilage dissolution technique was used to create bone models without cartilage 25-32 . The joint surfaces of the specimens were soaked in 6.0% sodium hypochlorite for 12 to 24 hours to dissolve the articular cartilage 29 . We visually inspected and checked the cartilage by touching the surface with a surgical probe to ensure that the cartilage was completely dissolved 31 .…”

Section: Methodsmentioning

confidence: 99%

Regional Distribution of Articular Cartilage Thickness in the Elbow Joint

Miyamura

Sakai

Oka

et al. 2019

JBJS OA

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Background:During elbow procedures, reconstruction of the joint (including the articular cartilage) is important in order to restore elbow function; however, the regional distribution of elbow cartilage is not completely understood. The purpose of the present study was to investigate the 3-dimensional (3-D) distribution patterns of cartilage thickness of elbow bones (including the distal part of the humerus, proximal part of the ulna, and radial head) in order to elucidate the morphological relationship among them.Methods:Two 3-D surface models were created with use of a laser scanner: (1) a cartilage-bone model based on 20 elderly cadaveric elbows exhibiting normal cartilaginous conditions and (2) a bone model that was created after dissolving the cartilage. The 2 models were superimposed, and cartilage thickness was measured as the interval distance on the articular surface. Measurements were made at categorized anatomical points of the individual bones, and 3-D distributions on the entire articular surface were analyzed. The spatial relationship among individual bones was also assessed.Results:In the distal part of the humerus, the cartilage was thickest in the intermediate region between the capitellum and the trochlea (mean [and standard deviation], 1.27 ± 0.17 mm); in the proximal part of the ulna, it was thickest at the anterolateral edge of the coronoid (2.20 ± 0.39 mm) and the anteroproximal edge of the proximal sigmoid notch (2.49 ± 0.55 mm); and in the radial head, it was thickest at the articular zone on the rim circumference within the dish (1.10 ± 0.17 mm) and on the proximal circumference around the side (1.02 ± 0.17 mm) (p < 0.001 for all). These thicker cartilage regions gathered on the joint center, facing each other.Conclusions:The present study demonstrated regional variations in elbow cartilage thickness. The combined findings in individual bones showed “cartilage gathering” at the center of the elbow joint, which we believe to be a novel anatomical finding.Clinical Relevance:An enhanced understanding of elbow cartilage geometry will provide additional insights into elbow procedures in elderly individuals, such as hemiarthroplasties, in which anatomical contours could help to restore normal joint function and improve postoperative outcomes.

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Accuracy assessment of 3D bone reconstructions using CT: an intro comparison

Cited by 46 publications

References 17 publications

In Vivo Evaluation of 3D-Printed Polycaprolactone Scaffold Implantation Combined with β-TCP Powder for Alveolar Bone Augmentation in a Beagle Defect Model

In Vivo Evaluation of 3D-Printed Polycaprolactone Scaffold Implantation Combined with β-TCP Powder for Alveolar Bone Augmentation in a Beagle Defect Model

Evaluation of Four-Dimensional Computed Tomography as a Technique for Quantifying Carpal Motion

Regional Distribution of Articular Cartilage Thickness in the Elbow Joint

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