Morphometric analysis of the relationships between intervertebral disc and vertebral body heights: an anatomical and radiographic study of the human thoracic spine

Kunkel, Maria Elizete; Herkommer, A. M.; Reinehr, Michael; Böckers, Tobias M.; Wilke, Hans–Joachim

doi:10.1111/j.1469-7580.2011.01397.x

Cited by 46 publications

(36 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These sandglass‐type changes in the transverse diameter may also be explained by influence of adjacent organs in the posterior mediastinum, especially arch of aorta and descending aorta. Interestingly, significant decreases in many parameters were also found at L5 and S1 levels in both genders, and this finding is consistent with previous cadaveric studies . Higher stress is expected at the pelvic‐lumbar junction as a base of the entire spinal column and therefore larger endplate area and dimensions are expected in this region from a biomechanical point of view.…”

Section: Discussionsupporting

confidence: 90%

“…Significant decreases in the transverse diameters were found at T4 in both superior and inferior endplates in males and significant increases in superior and inferior endplates in both genders were found below the T4 level. The decrease in the transverse diameter toward T4 and the increase from T4 was highlighted in the aforementioned study by Masharawi et al and this finding was discussed from evolutionary, kinematic and biomechanical aspects . These sandglass‐type changes in the transverse diameter may also be explained by influence of adjacent organs in the posterior mediastinum, especially arch of aorta and descending aorta.…”

Section: Discussionmentioning

confidence: 82%

See 1 more Smart Citation

In vivo measurement of vertebral endplate surface area along the whole‐spine

Kishimoto

Akeda

Sudo

et al. 2016

Journal Orthopaedic Research

View full text Add to dashboard Cite

Accurate determination of vertebral endplate surface area and diameters plays an important role in surgical procedures, spinal implant design and sizing. The objective of this study was to contribute with baseline information on the endplate geometrical parameters using subject-based 3D whole-spine computed tomography (CT) models based on myelogram CT images taken of 49 patients with spinal disorders. Superior and inferior bony endplate mesh-models were created from said 3D CT models and endplate geometrical parameters including total polygon-mesh areas, projected areas and antero posterior and transverse diameters of each endplate were measured. The position of each endplate was determined by the cumulative distance along the spinal column with respect to C2. Endplate area and diameters were analyzed by gender, spinal level, age and correlation with spinal position. Males had larger endplates than females at all levels (p < 0.05) but S1. While endplate areas and transverse diameters increased with age at C3-L5 in females, these increases were not consistent through the whole-spine and even decreases with age were found at T1-T3 in males. There was a strong linear correlation between endplate area and spinal position in males and females with correlation coefficient values of r ¼ 0.938 and r ¼ 0.911, respectively. However, multiple comparisons of the geometrical parameters through the whole-spine revealed localized reduction of the anteroposterior or transverse diameters at T4 and L5-S1 levels. These regional and agerelated changes in endplate dimensions should be taken into account for safe interventional treatments at these sites. Keywords: endplate; surface area; endplate dimension, spine; computed tomography; three-dimensional measurement Accurate knowledge of vertebral endplate morphology is important to better understand its structurefunction relationships, 1-4 with respect to its influence and role in intervertebral disc degeneration, and to design proper surgical procedures, tissue-engineered disc replacement constructs and spinal implants. 5,6 Measurement of the endplate surface area provides essential information to be used for estimation of stress and pressure in intervertebral discs, estimation of disc volume and adequate sizing of spinal implants. To date, these endplate morphological parameters have been gathered mainly by means of planar methods. [6][7][8][9][10][11][12][13] Since the endplate actually has complex three-dimensional (3D) geometry, questions arise about whether appropriate 3D endplate surface models are necessary for accurate measurements of any morphological parameter, including the surface area. Information on the endplate surface area spanning the entire human spine is limited in the literature. To the best of the authors' knowledge, currently there is no in vivo study providing results of 3D-based endplate surface area measurements.Continuous increases in endplate dimensions along the spine have been reported in the literature. 6,7,14,15 We hypothesize that the endplat...

show abstract

Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 82%

In vivo measurement of vertebral endplate surface area along the whole‐spine

Kishimoto

Akeda

Sudo

et al. 2016

Journal Orthopaedic Research

View full text Add to dashboard Cite

show abstract

“…Since the instrumented or fixation level of each patient differs from each other, the corresponding sagittal angle of curvature of each vertebra level was also determined. The angle of sagittal curvature of each vertebra level was approximated by the ratio of each height of vertebra [41]. The spine sagittal angle of curvature between the corresponding fixation level θ FL (FL = most superior and inferior fixation level) of each patient is listed in Table 2.…”

Section: Spine Sagittal Curvaturementioning

confidence: 99%

Influence of implant rod curvature on sagittal correction of scoliosis deformity

et al. 2014

View full text Add to dashboard Cite

PURPOSE:To analyze the changes of implant rod angle of curvature during surgery and establish its influence on sagittal correction of scoliosis deformity. STUDY DESIGN:A retrospective analysis of the preoperative and postoperative implant rod geometry and angle of curvature was conducted.PATIENT SAMPLE: Twenty adolescent idiopathic scoliosis patients underwent surgical operation. Average age at the time of operation was 14 years. OUTCOME MEASURES:The preoperative and postoperative implant rod angle of curvature expressed in degrees was obtained for each patient. METHODS:Two implant rods were attached to the concave and convex side of the spinal deformity. The preoperative implant rod geometry was measured before surgical implantation.The postoperative implant rod geometry after surgery was measured by Computed Tomography scanner. The implant rod angle of curvature at the sagittal plane was obtained from the implant rod geometry. The angle of curvature between the implant rod extreme ends was measured before implantation and after surgery. The sagittal curvature between the corresponding spinal levels of healthy adolescents obtained by previous studies was compared to the implant rod angle of curvature to evaluate the sagittal curve correction. The difference between the postoperative implant rod angle of curvature and normal spine sagittal curvature of the corresponding instrumented level was used to evaluate over or under correction of the sagittal deformity.Page | 3 RESULTS:The implant rods at the concave side of deformity of all patients were significantly deformed after surgery. The average degree of rod deformation Δθ at the concave and convex side was 15.8 deg. and 1.6 deg., respectively. The average preoperative and postoperative implant rod angle of curvature at the concave side was 33.6 deg. and 17.8 degrees, respectively. The average preoperative and postoperative implant rod angle of curvature at the convex side was 25.5 degrees and 23.9 degrees, respectively. A significant relationship was found between the degree of rod deformation and preoperative implant rod angle of curvature (r = 0.60, p < 0.005). The implant rods at the convex side of all patients did not have significant deformation. The results indicate that the postoperative sagittal outcome could be predicted from the initial rod shape. CONCLUSIONS:Changes in implant rod angle of curvature may lead to over or under correction of the sagittal curve. Rod deformation at the concave side suggests that corrective forces acting on that side are higher than the convex side.

show abstract

“…The mean craniocaudal movement of the IVC during the respiratory cycle was reported as 21.7 mm, 22 and the mean vertebral body and disc heights of lower thoracic spines were described as 19.6 mm (T11), 6.0 mm (T11/12), and 20.8 mm (T12). 23 These results indicate that the differences within 1 vertebral body height should be accepted as a potential respiratory movement.…”

Section: Discussionmentioning

confidence: 93%

Anatomical Variations of the Right Adrenal Vein

et al. 2017

View full text Add to dashboard Cite

P rimary aldosteronism (PA) is currently considered the most frequent cause of secondary hypertension, 1 with an estimated prevalence of ≈11% in hypertensive patients. 2,3Because a unilateral aldosterone-producing adenoma can be cured by adrenalectomy and bilateral hyperaldosteronism is usually treated medically, 4,5 adrenal venous sampling (AVS) is necessary to provide a subtype diagnosis of PA. However, blood sampling from the right adrenal vein (RAV) remains difficult because of its small size and anatomical variations. Therefore, RAV mapping before AVS is required for technical success.Some past reports used contrast-enhanced multidetector computed tomography (MDCT) for visualization of the RAV. Several reports mentioned that the correct craniocaudal levels at the RAV orifice were identified in a majority of patients using MDCT; 6,7 however, these studies did not note the angle of inflow of the RAV. A study by Matsuura et al 8 reported the location of the RAV orifice on the horizontal plane and a 3-dimensional angle of inflow of the RAV using an 8-detector row computed tomography (CT). In this study, RAV anatomies were not compared using catheter venographic findings obtained during AVS, and the acquisition timing was not particularly designed to access the RAV. Although a common trunk with an accessory hepatic vein (AHV) has been considered the most frequent anatomical variant of the RAV 9 that may decrease AVS success rates, 10 its prevalence varied across previous studies, ranging from 8% to 24%. 7,8,10,11 These studies may have had fewer subjects to determine the prevalence of anatomical variations. Moreover, the angle of inflow of the RAV in the common-trunk type has not been evaluated. In addition, even though the common trunk was not formed, the lesser distance between the RAV orifices and the AHV may cause sampling failure because of misidentification. 12Comprehensive anatomy of the RAV will help with successful AVS procedures achieved by appropriate catheter selection and manipulation.The purpose of this study was to provide a detailed description of anatomical variations of the RAV and to evaluate the concordance of RAV imaging between MDCT and catheter venography in a large population of patients with PA.Abstract-Adrenal venous sampling is the most reliable diagnostic procedure to determine surgical indications in primary aldosteronism. Because guidelines recommend multidetector computed tomography (CT) to evaluate the adrenal gland, some past reports used multidetector CT as a guide for adrenal venous sampling. However, the detailed anatomy of the right adrenal vein and its relationship with an accessory hepatic vein remains uncertain. The purpose of this study was to describe detailed anatomical variations of the right adrenal vein and to determine the concordance between CT and catheter venography in patients with primary aldosteronism. In total, 440 consecutive patients who underwent adrenal venous sampling were included. Four-phase dynamic CT was performed. Anatomical locations and variations...

show abstract

Morphometric analysis of the relationships between intervertebral disc and vertebral body heights: an anatomical and radiographic study of the human thoracic spine

Cited by 46 publications

References 30 publications

In vivo measurement of vertebral endplate surface area along the whole‐spine

In vivo measurement of vertebral endplate surface area along the whole‐spine

Influence of implant rod curvature on sagittal correction of scoliosis deformity

Anatomical Variations of the Right Adrenal Vein

Contact Info

Product

Resources

About