Precision of cortical bone reconstruction based on 3D CT scans

2009 ◽  
Vol 33 (3) ◽  
pp. 235-241 ◽  
Author(s):  
Jianping Wang ◽  
Ming Ye ◽  
Zhongtang Liu ◽  
Chengtao Wang
Keyword(s):  
Cortical Bone ◽  
Ct Scans ◽  
Bone Reconstruction ◽  
3D Ct

scholarly journals A study of the relation between the lingual cortical bone of impacted mandibular third molars on CT scans and panoramic radiographs

2009 ◽  
Vol 55 (1) ◽  
pp. 29-33
Author(s):  
Mizuki OHASHI ◽  
Hiroshi NAKAJIMA ◽  
Chieko MASUDA ◽  
Wakako SUMIMOTO ◽  
Yuka NAKAMICHI ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Ct Scans ◽  
Third Molars ◽  
Panoramic Radiographs ◽  
Impacted Mandibular Third Molars ◽  
Mandibular Third Molars

Clinical Efficacy of Bone Reconstruction Surgery with Frozen Cortical Bone Allografts for Nonunion of Radial and Ulnar Fractures in Toy Breed Dogs

2018 ◽  
Vol 31 (03) ◽  
pp. 159-169
Author(s):  
Yukari Nagahiro ◽  
Daichi Katori ◽  
Norihiro Muroi ◽  
Hiroyuki Akagi ◽  
Nobuo Kanno ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Bone Remodelling ◽  
Weight Bearing ◽  
Healing Process ◽  
Bone Reconstruction ◽  
Bone Allografts ◽  
Bone Remodelling Process ◽  
Large Bone ◽  
Atrophic Nonunion ◽  
Large Bone Defects

Objective To evaluate the effectiveness of frozen cortical bone allografts (FCBA) in the treatment of severe radial and ulnar atrophic nonunion fractures. Animals Toy breed dogs with nonunion of radial and ulnar fractures (n = 15). Methods Severe atrophic nonunion fractures were treated with FCBA (eight infected and seven non-infected fractures). Radiographs obtained immediately after surgery, and 1, 2, 3, 6 and 12 months later were evaluated and scored for the periosteal reaction at the bone regeneration sites, the healing process in the bone connection areas at both the proximal and distal sites, and the bone remodelling process within the allografts. Results Improvements in the fracture-healing process and weight-bearing function were observed in all cases. Radiographic scores at the bone connection areas and within the allograft improved significantly over time (p < 0.05). There were not any significant differences in radiographic scores between the infected and non-infected groups. Clinical Significance Bone reconstruction with FCBA is effective in the treatment of radial and ulnar nonunion fractures associated with large bone defects, regardless of the infection status of the surgical site.

Description of Mandibular Improvements in a Series of Infants With Congenital Muscular Torticollis and Deformational Plagiocephaly Treated With Physical Therapy

2018 ◽  
Vol 55 (9) ◽  
pp. 1282-1288
Author(s):  
Regina Fenton ◽  
Susan Gaetani ◽  
Zoe MacIsaac ◽  
Eric Ludwick ◽  
Lorelei Grunwaldt
Keyword(s):  
Retrospective Study ◽  
Physical Therapy ◽  
Late Onset ◽  
Ct Scans ◽  
3D Ct ◽  
Deformational Plagiocephaly ◽  
Congenital Muscular Torticollis ◽  
3D Ct Scan ◽  
Small Cohort ◽  
Muscular Torticollis

Background: Many infants with congenital muscular torticollis (CMT) have deformational plagiocephaly (DP), and a small cohort also demonstrate mandibular asymmetry (MA). The aim of this retrospective study was to evaluate mandibular changes in these infants with previous computed tomography (CT) scans who underwent physical therapy (PT) to treat CMT. Methods: A retrospective study included patients presenting to a pediatric plastic surgery clinic from December 2010 to June 2012 with CMT, DP, and MA. A small subset of these patients initially received a 3D CT scan due to concern for craniosynostosis. An even smaller subset of these patients subsequently received a second 3D CT scan to evaluate for late-onset craniosynostosis. Patients were treated with PT for at least 4 months for CMT. Initial CT scans were retrospectively compared to subsequent CT scans to determine ramal height asymmetry changes. Clinical documentation was reviewed for evidence of MA changes, CMT improvement, and duration of PT. Results: Ten patients met inclusion criteria. Ramal height ratio (affected/unaffected) on initial CT was 0.87, which significantly improved on subsequent CT to 0.93 ( P < .05). None of the patients were diagnosed with craniosynostosis on initial CT. One patient was diagnosed with late-onset coronal craniosynostosis on subsequent CT. Conclusions: We identified a small cohort of infants with MA, CMT, and DP. These patients uniformly demonstrated decreased ramal height ipsilateral to the affected sternocleidomastoid muscle. Ramal asymmetry measured by ramal height ratios improved in all infants undergoing PT.

scholarly journals Automated 3D MRI Allows for Accurate Evaluation of Glenoid Bone Loss as Compared to 3D CT

2018 ◽  
Vol 6 (7_suppl4) ◽  
pp. 2325967118S0008
Author(s):  
Drew A. Lansdown ◽  
Robert Dawe ◽  
Gregory L. Cvetanovich ◽  
Nikhil N. Verma ◽  
Brian J. Cole ◽  
...  
Keyword(s):  
Bone Loss ◽  
3D Reconstruction ◽  
Ct Scan ◽  
Glenoid Bone Loss ◽  
Ct Scans ◽  
Reconstruction Method ◽  
Slice Thickness ◽  
3D Ct ◽  
Ct Reconstruction ◽  
3D Mri

Objectives: Glenoid bone loss is frequently present in the setting of recurrent shoulder instability. The magnitude of bone loss is an important determinant of the optimal surgical treatment. The current gold-standard for measurement of glenoid bone loss is three-dimensional (3D) reconstruction of a computed tomography (CT) scan. CT scans, however, carry an inherent risk of radiation and increased cost for a second modality. Magnetic resonance imaging (MRI) offers excellent soft tissue contrast and may allow resolution of bony structures to generate 3D reconstructions without a risk of ionizing radiation. We hypothesized that automated 3D MRI reconstruction would offer similar measurements of glenoid bone loss as recorded from a 3D CT scan in a clinical setting. Methods: A retrospective review was performed for fourteen patients who had both pre-operative MRI scan and CT scan of the shoulder. All MR scans were performed on a 1.5 T scanner (Siemens) utilizing a Dixon chemical shift separation sequence and the out-of-phase images with 0.90 mm slice thickness. Reconstructions of the glenoid were performed from axial images (Figure 1A) using an open-platform image processing system (3D Slicer; slicer.org). A single point on the glenoid was selected and a standard threshold was used to build a 3D model (Figure 1B). High-resolution CT scans underwent 3D reconstruction in Slicer based on Houndsfield Unit thresholding. Glenoid bone loss on both scans was measured with the Pico method by defining a circle of best fit using the inferior 2/3 of the glenoid and determining the percent area missing from this circle. Pearson’s correlation coefficient was utilized to determine the similarity between MR and CT based measurements. Statistical significance was defined as p<0.05. Results: The correlation between 3D MR and CT-based measurements of glenoid bone loss was excellent (r = 0.95, p<0.0001). The mean bone loss as measured by the 3D MR was 13.2 +- 7.2% and was 12.5 +- 8.6% for the 3D CT reconstruction (p=0.32). Bone loss in this cohort ranged from 3.7-25.4% on 3D MR and 1.4-26.0% on 3D CT. The root-mean-square difference between measurements was 2.7%. Conclusion: There was excellent agreement between automated 3D MR and 3D CT measurements of glenoid bone loss and minimal differences between these measurements. This reconstruction method requires minimal post-processing, no manual segmentation, and is obtained with widely-available MR sequences. This method has the potential to decrease the utilization for CT scans in determining glenoid bone loss. [Figure: see text]

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