A comparison of 3-D computed tomography versus 2-D radiography measurements of ulnar variance and ulnolunate distance during forearm rotation

2013 ◽  
Vol 39 (5) ◽  
pp. 526-532 ◽  
Author(s):  
Y. Kawanishi ◽  
H. Moritomo ◽  
S. Omori ◽  
T. Kataoka ◽  
T. Murase ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Incident Angle ◽  
Three Dimensional ◽  
Ulnar Variance ◽  
Radiographic Measurement ◽  
Forearm Rotation ◽  
Radiographic Measurements ◽  
Ulnar Impaction ◽  
The Mean ◽  
Ulnar Impaction Syndrome

Positive ulnar variance is associated with ulnar impaction syndrome and ulnar variance is reported to increase with pronation. However, radiographic measurement can be affected markedly by the incident angle of the X-ray beam. We performed three-dimensional (3-D) computed tomography measurements of ulnar variance and ulnolunate distance during forearm rotation and compared these with plain radiographic measurements in 15 healthy wrists. From supination to pronation, ulnar variance increased in all cases on the radiographs; mean ulnar variance increased significantly and mean ulnolunate distance decreased significantly. However on 3-D imaging, ulna variance decreased in 12 cases on moving into pronation and increased in three cases; neither the mean ulnar variance nor mean ulnolunate distance changed significantly. Our results suggest that the forearm position in which ulnar variance increased varies among individuals. This may explain why some patients with ulnar impaction syndrome complain of wrist pain exacerbated by forearm supination. It also suggests that standard radiographic assessments of ulnar variance are unreliable.

Distal radioulnar joint configurations in three-dimensional computed tomography in patients with idiopathic ulnar impaction syndrome

2019 ◽  
Vol 44 (5) ◽  
pp. 488-495 ◽  
Author(s):  
Jihyeung Kim ◽  
Jaewoo Cho ◽  
Yo-Han Lee ◽  
Sohee Oh ◽  
Hyun Sik Gong ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Three Dimensional ◽  
Joint Space ◽  
Distal Radioulnar Joint ◽  
Radioulnar Joint ◽  
Ulnar Head ◽  
Sigmoid Notch ◽  
Ulnar Shortening Osteotomy ◽  
Ulnar Impaction ◽  
Ulnar Impaction Syndrome

We retrospectively reviewed 26 patients diagnosed with idiopathic ulnar impaction syndrome and measured the slopes of the sigmoid notch and ulnar head at their centre using their preoperative three-dimensional computed tomography. We found that the slope of the sigmoid notch and that of the ulnar head were not parallel to each other. There was a significant linear relation between the slope of the ulnar head and the changes in the closest joint space of the distal radioulnar joint at the centre of the sigmoid notch after ulnar shortening. We conclude that the slope of the ulnar head is more strongly correlated with changes in the closest joint space in the distal radioulnar joint than that of the sigmoid notch. Our findings suggest that slope of the ulnar head might be as important a predisposing factor as that of the sigmoid notch for the progression of distal radioulnar joint arthritis after ulnar-shortening osteotomy. We should consider the slopes of both the sigmoid notch and ulnar head before the osteotomy. Level of evidence: IV

During forearm rotation the three-dimensional ulnolunate distance is affected more by translation of the ulnar head than change in ulnar variance

2018 ◽  
Vol 44 (5) ◽  
pp. 517-523
Author(s):  
Seung-Han Shin ◽  
Yong-Suk Lee ◽  
Keun-Young Choi ◽  
Dai-Soon Kwak ◽  
Yang-Guk Chung
Keyword(s):  
Linear Relationship ◽  
Three Dimensional ◽  
Ulnar Variance ◽  
Forearm Rotation ◽  
Level Of Evidence ◽  
Positive Linear Relationship ◽  
Computed Tomographic ◽  
Ulnar Head ◽  
The Mean

Ulnolunate abutment has been thought to be aggravated by pronation because of an increase in ulnar variance. We hypothesized that the ulnolunate distance might be greater in pronation because the ulnar head is dorsally translated. Twenty-one three-dimensional reconstructions of computed tomographic scans of wrists taken in supination and pronation were investigated. The ulnolunate distance was measured in each position, and the change in ulnolunate distance from supination to pronation was calculated. The changes in ulnar variance from supination to pronation and the amount of translation of the ulnar head were measured directly by superimposing three-dimensional reconstructions. The mean ulnolunate distance in pronation was significantly greater than in supination. There was no significant correlation between the changes in ulnolunate distance and in the ulnar variance. The change in ulnolunate distance had a significant positive linear relationship with the amount of translation of the ulnar head. The change in ulnolunate distance during forearm rotation is determined by the amount of translation of the ulnar head rather than by change in ulnar variance. Level of evidence: IV

scholarly journals Application of 3D Computed Tomography Reconstruction Images to Assess the Thickness and Dimensions of the Posterior Palatal Seal Area

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Soeun Lim ◽  
Seoung-Jin Hong ◽  
Joo-Young Ohe ◽  
Janghyun Paek
Keyword(s):  
Computed Tomography ◽  
3D Model ◽  
Three Dimensional ◽  
Ct Images ◽  
Anterior Border ◽  
Lateral Direction ◽  
Mean Dimension ◽  
The Mean ◽  
The Right ◽  
Palatal Mucosa

Few studies have been reported on the scientific measurements of the thickness and dimensions of the posterior palatal seal (PPS) area. The purpose of this study is to measure and analyze the thickness of palatal mucosa by using a three-dimensional (3D) model reconstructed with computed tomography (CT) images and to present objective values by identifying the PPS area. The CT images were reconstructed as a 3D model by separating the maxillary palate mucosa and teeth. Each reconstructed model was analyzed and the thickness was measured at 93 crossing points of each divided plane. The dimension of the PPS area was measured and the right and left dimensions of the PPS area were compared. The thickness of the palatal mucosa was thicker toward the posterior area. The thickness increased in the lateral direction and decreased again. In the PPS area, the mean dimension between the rearmost of anterior border and the most posterior line was 2.19 mm and the mean dimension between the forefront of anterior border and the most posterior line was 5.19 mm in the right side and 5.16 mm in the left side. The mean dimension from the center of the palate to the right most forward point was 6.85 mm, and the left was 7.36 mm. The new measurement method of palatal mucosal thickness is noninvasive, accurate, and easy to store and study, so it can be used effectively in planning and manufacturing the maxillary complete denture in the digital workflows.

The length and position of the long axis of the scaphoid measured by analysis of three-dimensional reconstructions of computed tomography images

2010 ◽  
Vol 36 (2) ◽  
pp. 98-101 ◽  
Author(s):  
Y. Guo ◽  
G. L. Tian
Keyword(s):  
Computed Tomography ◽  
Three Dimensional ◽  
Spiral Computed Tomography ◽  
Surface Model ◽  
Spiral Computed ◽  
Proximal Point ◽  
Computed Tomography Images ◽  
Distal Point ◽  
Dorsal Ridge ◽  
The Mean

We established the maximum length and the position of the long axis of the scaphoid from three-dimensional reconstructions of spiral computed tomography in 30 pairs of wrists. The distance between two points on the three-dimensional scaphoid surface model were calculated using commercially available software and corresponding coordinates of the two points were documented. The mean length was 29.3 (SD 1.6) mm for men and 26.6 (SD 1.8) mm for women. The location of the distal point was at the centre of the scaphoid tuberosity, with the proximal point of the long axis located at the dorsal ridge of the scapholunate facet.

scholarly journals Preliminary Outcomes Following Application Of The Real-Time Navigation System Combined With Intraoperative Three-Dimensional C-Arm Computed Tomography For Zygomatico-Orbital Fracture Reconstruction

2021 ◽  
Author(s):  
Yu-Ying Chu ◽  
Jia-Ruei Yang ◽  
Han Tsung Liao ◽  
Bo-Ru Lai
Keyword(s):  
Computed Tomography ◽  
Real Time ◽  
Navigation System ◽  
Surgical Navigation ◽  
Three Dimensional ◽  
Orbital Fracture ◽  
The Real ◽  
Orbital Volume ◽  
Surgical Navigation System ◽  
The Mean

Abstract This study analyzed the outcomes of zygomatico-orbital fracture reconstruction using the real-time navigation system with intraoperative three-dimensional (3D) C-arm computed tomography (CT). Fifteen patients with zygomatico-orbital or isolated orbital/zygoma fractures were enrolled in this prospective cohort. For zygoma reduction, the displacement at five key sutures and the differences between preoperative and intraoperative CT images were compared. For orbital reconstruction, the bilateral orbital volume differences in the anterior, middle, and posterior angles over the medial transitional buttress were measured. Two patients required implant adjustment once after the intraoperative 3D C-arm assessment. On comparing the preoperative and postoperative findings for the zygoma, the average sum of displacement was 19.48 (range, 5.1–34.65) vs. ±1.96 (0–3.95) mm (P < 0.001) and the deviation index was 13.56 (10–24.35) vs. 2.44 (0.6–4.85) (P < 0.001). For the orbit, the mean preoperative to postoperative bilateral orbital volume difference was 3.93 (0.35–10.95) vs. 1.05 (0.12–3.61) mm3 (P <0.001). The mean difference in the bilateral angles at the transition buttress was significantly decreased postoperatively at the middle and posterior one-third. The surgical navigation system with the intraoperative 3D C-arm can effectively improve the accuracy of zygomatico-orbital fracture reconstruction and decrease implant adjustment times.

Abstract WMP30: Risk Analysis Of Growth And Rupture In Unruptured Intreacranial Aneurysms : Single Institutional Cohort Study

Stroke ◽  
2013 ◽  
Vol 44 (suppl_1) ◽  
Author(s):  
Yuichi Murayama ◽  
Toshihiro Ishibashi ◽  
Hiroyuki Takao ◽  
Ichiro Yuki ◽  
Hideki Arakawa ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Three Dimensional ◽  
Aneurysm Rupture ◽  
Posterior Circulation ◽  
Single Center ◽  
Risk Of Rupture ◽  
Aneurysm Growth ◽  
The Mean ◽  
Small Aneurysms

Introduction: Risk of growth and rupture in unruptured intracranial saccular aneurysm (UIA) are still unclear. Hypothesis: Gowth and risk of UIA may be correlated and they were evaluated our single center large cohort. Methods: Between January 2003 and March 2011, a total of 2122 patients with 2756 UIA were referred to our institution. 1403 patients with 2037 UIAs were assigned for conservative management. The mean follow up duration was 6201 aneurysm-years. Bi-annual three-dimensional computed tomography angiography (3D CTA) was performed and aneurysm growth was evaluated using 3D workstation. The aneurysm growth was defined as size increase more than 1mm. Results: During observation, 14.6% aneurysms increased their size. Female and male growth rate were 16% and 11% respectively. 130 patients stopped observation and therapeutic intervention was performed due to increase their size or anxiety. During observation 50 UIAs ruptured resulting in a 0.8% rupture rate per year. Aneurysm growth, IC-pcom aneurysms, posterior circulation, female, and SAH associated multiple aneurysms were risk factor for aneurysm rupture. Growing aneurysm was 10 times higher relative risk of rupture compare to stable aneurysm. No aneurysm demonstrated reduction of their size after rupture. Conclusions: Risk of Aneurysm growth and rupture may be correlated. Risk of rupture of UIAs was similar that was reported before but even small aneurysms can be rupture during observation. Growing UIAs should be considered to treat as soon as possible even in small size.

Computed Tomographic Trochlear Depth Measurement in Normal Dogs

2018 ◽  
Vol 31 (06) ◽  
pp. 431-437 ◽  
Author(s):  
Elena De Giacinto ◽  
Daniele Troiano ◽  
Francesco Denti ◽  
Michela Buiatti ◽  
Massimo Petazzoni
Keyword(s):  
Computed Tomography ◽  
Three Dimensional ◽  
Groove Depth ◽  
Trochlear Groove ◽  
Depth Measurement ◽  
Computed Tomography Images ◽  
Depth Ratio ◽  
Wide Range ◽  
The Mean ◽  
Patellar Thickness

Objectives The main purpose of this study was to describe the relationship between patellar maximal craniocaudal thickness and femoral trochlear groove depth in normal dogs and to valuate the intra-observer or inter-observer variability of maximal trochlear depth and maximal patellar craniocaudal thickness using computed tomography. Methods Trochlear groove depth and patellar maximal craniocaudal thickness of 40 limbs (20 dogs) were measured by three independent veterinarians using three-dimensional multiplanar reconstruction computed tomography images. The patellar maximal craniocaudal thickness/trochlear depth ratio was determined. Results The mean ratio of these stifles was 0.46 (range 0.24–0.70), meaning that the mean maximal depth of the trochlea was 46% of the mean maximal-patellar thickness. Clinical Significance A wide range of maximal–patellar–craniocaudal–thickness/maximal trochlear-depth ratio was found suggesting that breed studies should be performed to determine a breed-specific patellar-thickness/trochlear-depth ratio. To make decisions on when and where to perform a sulcoplasty during patellar luxation surgery, patella/trochlea thickness relationship should be measured for each breed with patellar tracking from stifle hyperflexion to stifle hyperextension.

Computed tomographic study of safe implantation corridors in rabbit lumbar vertebrae

2017 ◽  
Vol 30 (05) ◽  
pp. 357-363 ◽  
Author(s):  
Tisha Harper ◽  
Stephen Joslyn ◽  
Julia Whittington ◽  
Devon Hague ◽  
Mark Mitchell ◽  
...  
Keyword(s):  
Computed Tomography ◽  
New Zealand ◽  
Three Dimensional ◽  
Lumbar Vertebrae ◽  
Bone Stock ◽  
Computed Tomographic ◽  
Mean Width ◽  
Entry Points ◽  
New Zealand White Rabbits ◽  
The Mean

Summary Objectives: A study was performed to evaluate the lumbar vertebrae of domestic rabbits using computed tomography (CT) in order to identify safe corridors for implant insertion. Methods: Computed tomography imaging of 20 adult New Zealand white rabbits was evaluated using three-dimensional multi -planar reconstruction, and safe corridors were determined. Following corridor determination, implant placement was performed, and imaging was repeated. Results: The cranial and caudal endplates contained the majority of the vertebral bone stock, and were an average of 3.14 and 3.30 mm in length, respectively. The mean safe corridor angle was 62.9 degrees (range: 58.8–66.7), and the mean width of the corridor was 2.03 mm (range: 1.60– 2.07). Post-placement imaging revealed that 35% of the pins demonstrated errors of placement, most commonly canal impingement. Conclusions: The results of the corridor evaluation indicate that an insertion angle of approximately 60 degrees relative to the sagittal midline is appropriate for implant insertion in the lumbar vertebrae of New Zealand white rabbits. Additionally, due to the hourglass shape of rabbit vertebrae, the endplates provide maximal bone stock for implant purchase, so insertion should be attempted in these regions. However, the high percentage of errors in placement indicate the need to more clearly define entry points to access the canal, and highlight the challenges of appropriate placement in the small bones of rabbits.

scholarly journals A real 3D measurement technique for the tibial slope: differentiation between different articular surfaces and comparison to radiographic slope measurement

2020 ◽  
Vol 21 (1) ◽  
Author(s):  
Armando Hoch ◽  
Lukas Jud ◽  
Tabitha Roth ◽  
Lazaros Vlachopoulos ◽  
Philipp Fürnstahl ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Measurement Technique ◽  
Three Dimensional ◽  
Tibial Slope ◽  
Knee Surgery ◽  
Radiographic Measurement ◽  
3D Measurement ◽  
Articular Surfaces ◽  
The Mean ◽  
Lateral Plateau

Abstract Background The tibial slope plays an important role in knee surgery. However, standard radiographic measurement techniques have a low reproducibility and do not allow differentiation between medial and lateral articular surfaces. Despite availability of three-dimensional imaging, so far, no real 3D measurement technique was introduced and compared to radiographic measurement, which were the purposes of this study. Methods Computed tomography scans of 54 knees in 51 patients (41 males and 10 females) with a mean age of 46 years (range 22–67 years) were included. A novel 3D measurement technique was applied by two readers to measure the tibial slope of medial and lateral tibial plateau and rim. A statistical analysis was conducted to determine the intraclass correlation coefficient (ICC) for the new technique and compare it to a standard radiographic measurement. Results The mean 3D tibial slope for the medial plateau and rim was 7.4° and 7.6°, for the lateral plateau and rim 7.5° and 8.1°, respectively. The mean radiographic slope was 6.0°. Statistical analysis showed an ICC between both readers of 0.909, 0.987, 0.918, 0.893, for the 3D measurement of medial plateau, medial rim, lateral plateau and lateral rim, respectively, whereas the radiographic technique showed an ICC of 0.733. Conclusions The proposed novel measurement technique shows a high intraclass agreement and offers an applicable opportunity to assess the tibial slope three-dimensionally. Furthermore, the medial and lateral articular surfaces can be measured separately and one can differentiate the slope from the plateau and from the rim. As three-dimensional planning becomes successively more important, our measurement technique might deliver a useful supplement to the standard radiographic assessment in slope related knee surgery. Level of evidence Level III, diagnostic study.

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