scholarly journals Safe corridor for iliosacral and trans-sacral screw placement in Indian population: A preliminary CT based anatomical study

2019 ◽  
Vol 10 (2) ◽  
pp. 427-431
Author(s):  
Vivek Trikha ◽  
Sahil Gaba ◽  
Arvind Kumar ◽  
Samarth Mittal ◽  
Atin Kumar
Keyword(s):  
Indian Population ◽  
Anatomical Study ◽  
Screw Placement

scholarly journals Estimation of the Humerus Length by its Proximal Segments: A South Indian Anatomical Study

2019 ◽  
Vol 36 (02) ◽  
pp. 067-071
Author(s):  
Kasargod Umesh Prashanth ◽  
Mangala Manohar Pai ◽  
Bukkambudhi Virupakshamurthy Murlimanju ◽  
Latha Venkatraya Prabhu ◽  
Manoor Dass Prameela
Keyword(s):  
Indian Population ◽  
Anatomical Study ◽  
South Indian Population ◽  
Regression Equations ◽  
Morphometric Data ◽  
The South ◽  
South Indian ◽  
Pearson Coefficient ◽  
Best Parameter ◽  
The Right

Introduction To determine the morphometric data of the proximal segments of the humerus in the South Indian population, and to obtain the regression equations that will enable us to predict the whole length of humerus. Materials and Methods The present study included 166 dried adult human humeri. Their lengths were measured by using the osteometric board. The seven proximal segment lengths of the humeri were assessed by using a digital Vernier caliper (Mitutoyo Corporation 150 mm/6 inch, model number 500-196-20, Kawasaki, Japan). Results The mean humerus length in the present study was 30.75 ± 2.03 cm on the right side and 30.27 ± 2.28 cm on the left side. The comparison between the right and left sides of the proximal segments of the humerus did not yield statistically significant results (p > 0.05). The present study observed that the relationship between the dimensions of the proximal segments of the humerus and the length of humerus were strong (p = 0.00). The oblique length between the most proximal and distal points over the anatomical neck was the best parameter to predict the length of humerus (the Pearson coefficient was 0.78 for the right side and 0.77 for the left side). Conclusion The simple regression formulae, which were derived in this study, are helpful in the estimation of the length of the humerus. The formulae can be used in forensic investigations, in which the stature of a person has to be determined and only bone fragments are available. The morphometric data of the present study have implications in archaeological and anthropological studies. The data are enlightening to orthopedicians, when planning reconstructive surgeries of the proximal end of the humerus in the South Indian population.

Feasible and Accurate Occipitoatlantal Transarticular Fixation: An Anatomic Study

2010 ◽  
Vol 66 (suppl_1) ◽  
pp. ons-173-ons-177 ◽  
Author(s):  
Mehmet Senoglu ◽  
Sam Safavi-Abbasi ◽  
Nicholas Theodore ◽  
Neil R. Crawford ◽  
Volker K.H. Sonntag
Keyword(s):  
Anatomical Study ◽  
Craniovertebral Junction ◽  
Screw Placement ◽  
Occipital Condyle ◽  
X Rays ◽  
Anatomic Study ◽  
Screw Insertion ◽  
Computed Tomographic ◽  
Entry Points ◽  
Transarticular Fixation

Abstract Background: Defining the anatomic zones for the placement of occiput-C1 transarticular screws is essential for patient safety. Objective: The feasibility and accuracy of occiput-C1 transarticular screw placement were evaluated in this anatomical study of normal cadaveric specimens. Material and Methods: Sixteen measurements were determined for screw entry points, trajectories, and lengths for placement of transarticular screws, as applied in the technique described by Grob, on the craniovertebral junction segments (occiput-C2) of 16 fresh human cadaveric cervical spines and 41 computed tomographic reconstructions of the craniovertebral junction. Acceptable angles for screw positioning were measured on digital x-rays. Results: All 32 screws were placed accurately. As determined by dissection of the specimens, none of the screws penetrated the spinal canal. Screw insertion caused no fractures, and the integrity of the hypoglossal canal was maintained in all the disarticulated specimens. Conclusion: Viable transarticular occiput-C1 screw placement is possible, despite variability of the anatomy of the occipital condyle.

Surgical anatomy of the C-2 pedicle

2001 ◽  
Vol 95 (1) ◽  
pp. 88-92 ◽  
Author(s):  
Jay U. Howington ◽  
John J. Kruse ◽  
Deepak Awasthi
Keyword(s):  
Sagittal Plane ◽  
Pedicle Screws ◽  
Anatomical Study ◽  
Ct Scanning ◽  
Surgical Anatomy ◽  
Screw Placement ◽  
Preoperative Imaging ◽  
Direct Visualization ◽  
Content Type ◽  
Fine Print

Object. The goal of this anatomical study was to investigate the surgical and radiographic anatomy of the C-2 pedicle in relation to transpedicular screw placement in occipitocervical stabilization and to establish anatomical guidelines for the placement of C-2 pedicle screws. Methods. The C-2 pedicles in 10 cadaveric spines were evaluated using both computerized tomography (CT) scanning and manual measurements. The specimens were scanned; the mediolateral and rostrocaudal angulations of each pedicle were measured, with the midline sagittal plane and the inferior endplate of the C-2 facet, respectively, as references, and values were recorded in 1° increments by using a digital goniometer. The height, width, and length of the pedicles were also measured on the CT scans. Based on these measurements in conjunction with direct visualization of the C-2 pedicle through the C1–2 interlaminar space pedicle screws were then placed. The distances from the screw entry point to the midline, C2–3 joint line, and the medial aspect of the vertebral artery were also measured. Repeated CT scanning was then performed to assess screw placement. The average pedicle height, width, and length measured 9.1 mm, 7.9 mm, and 16.6 mm, respectively, and the medial inclination and rostrocaudal angulation averaged 35.2° and 38.8°, respectively. The cortex of the pedicle was not violated in any of the 20 cadaveric specimens. Conclusions. Adequate preoperative imaging studies in conjunction with direct visualization of the C-2 pedicle make transpedicular fixation safe and effective.

scholarly journals Digital anatomical study of screw placement for quadrilateral plate through the middle window of ilioinguinal approach

2019 ◽  
Author(s):  
Bei Zhao ◽  
Weidong Mu
Keyword(s):  
Inclination Angle ◽  
Three Dimensional ◽  
Anatomical Study ◽  
Chinese Patients ◽  
Screw Placement ◽  
Insertion Point ◽  
Ilioinguinal Approach ◽  
Quadrilateral Plate ◽  
Dimensional Reconstruction ◽  
The Mean

Abstract Background Screw placement directly for quadrilateral plate fractures of the acetabulum is very difficult. This study was performed to simulate the surgical procedure and try to obtain effective and safe screw angles through the middle window of ilioinguinal approach in Chinese patients. Methods We randomly collected the pelvic computed tomography (CT) scans of 50 adults. DICOM-formatted CT-scan images were imported into Mimics software. The three-dimensional reconstruction (3D) digital model of the semi-pelvic was established. In the coronal and sagittal planes, a 3.5 mm cylinder was used to simulate the pathway of the screw from the designated insertion point. The angles of insertion and intersex differences were explored by statistical analyses. Results The screws could be inserted via four angles: medial inclination, lateral inclination, anterior inclination and posterior inclination. The mean minimum medial inclination angle (MIMIA) of insertion point A was 4.96°±1.11° in males and 8.66°±3.40° in females, and the intersex difference was significant. The mean minimum medial inclination angle (MIMIA) of insertion point C was -5.31°±3.69° in males and 1.75°±8.95° in females, and the intersex difference was significant. There were no differences in all the angles between males and females in insertion point B. Conclusions Preoperative measurement and calculation by digital tools before the screw placement for quadrilateral plate fractures of the acetabulum are feasible. Double cortical screws could be placed safely through the middle window of ilioinguinal approach to increase the stability of acetabulum.

Navigated scaphoid screw placement using customized scaphoid splint: an anatomical study

2010 ◽  
Vol 130 (7) ◽  
pp. 889-895 ◽  
Author(s):  
Musa Citak ◽  
Padhraig F. O’Loughlin ◽  
Daniel Kendoff ◽  
Eduardo M. Suero ◽  
Ralph Gaulke ◽  
...  
Keyword(s):  
Anatomical Study ◽  
Screw Placement

scholarly journals CT-scan based anatomical study as a guidance for infra-acetabular screw placement

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Quanyi Lu ◽  
Runtao Zhou ◽  
Shichang Gao ◽  
Anlin Liang ◽  
Mingming Yang ◽  
...  
Keyword(s):  
Sagittal Plane ◽  
Three Dimensional ◽  
Anatomical Study ◽  
Ischial Tuberosity ◽  
Entry Point ◽  
Screw Placement ◽  
Minimum Thickness ◽  
Males And Females ◽  
The Relationship ◽  
Screw Group

Abstract Background The infra-acetabular corridor is quite narrow, which makes a challenge for the orthopedists to insert the screw. This study aimed to explore the relationship between the infra-acetabular corridor diameter (IACD) and the minimum thickness of medial acetabular wall (MTMAW), and to clarify the way of screw placement. Methods The Computed tomography (CT) data of 100 normal adult pelvises (50 males and 50 females respectively) were collected and pelvis three-dimensional (3D) reconstruction was performed by using Mimics software and the 3D model was imported into Geomagic Studio software. The perspective of acetabulum was carried out orienting from iliopubic eminence to ischial tuberosity and the IACD was measured by placing virtual screws which was vertical to the corridor transverse section of “teardrop”. The relationship between IACD and MTMAW was analyzed. When IACD was ≥5 mm, 3.5 mm all-in screws were placed. When IACD was < 5 mm, 3.5 mm in-out-in screws were placed. Results The IACD of males and females were (6.15 ± 1.24) mm and (5.42 ± 1.01) mm and the MTMAW in males and females were (4.40 ± 1.23) mm and (3.60 ± 0.81) mm respectively. The IACD and MTMAW in males were significantly wider than those of females (P < 0.05), and IACD was positively correlated with MTMAW (r = 0.859), the regression equation was IACD = 2.111 + 0.917 MTMAW. In the all-in screw group, 38 cases (76%) were males and 33 cases (66%) were females respectively. The entry point was located at posteromedial of the apex of iliopubic eminence, and the posterior distance and medial distance were (8.03 ± 2.01) mm and (8.49 ± 2.68) mm respectively in males. As for females, those were (8.68 ± 2.35) mm and (8.87 ± 2.79) mm respectively. In the in-out-in screw group, 12 cases (24%) were males and 17 cases (34%) were females, respectively. The posterior distance and medial distance between the entry point and the apex of iliopubic eminence were (10.49 ± 2.58) mm and (6.17 ± 1.84) mm respectively in males. As for females, those were (10.10 ± 2.63) mm and (6.63 ± 1.49) mm respectively. The angle between the infra-acetabular screw and the sagittal plane was medial inclination (0.42 ± 6.49) °in males, lateral inclination (8.09 ± 6.33) °in females, and the angle between the infra-acetabular screw and the coronal plane was posterior inclination (54.06 ± 7.37) °. Conclusions The placement mode of the infra-acetabular screw (IAS) can be determined preoperatively by measuring the MTMAW in the CT axial layers. Compared with all-in screw, the in-out-in screw entry point was around 2 mm outwards and backwards, and closer to true pelvic rim.

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