scholarly journals Pelvic Rotation and Inclination Affect Reliability of Sagittal Pelvic Alignment and Anterior Pelvic Plane Angle Measured by EOS System

10.29007/98fd ◽  
2018 ◽  
Author(s):  
Masashi Okamoto ◽  
Kunihiko Tokunaga
Keyword(s):  
Pelvic Tilt ◽  
Standing Position ◽  
Reference Points ◽  
Sacral Slope ◽  
Plane Angle ◽  
Anterior Pelvic Plane ◽  
Pelvic Rotation ◽  
X Ray ◽  
Axis Rotation ◽  
Eos System

The Difficulties to obtain acceptable pelvic reference points on bi- planar X-ray images for EOS measurements change as the patient’s pelvis rotated or inclined. The aim of this study was to clarify the effects of pelvic Z-axis rotation (rotation) and X-axis rotation (inclination) on the measurement values of SS, PT, and APP angle by using of EOS. Methods: We obtained anteroposterior and lateral X-ray images of a trunk phantom which was rotated and inclined in standing position by using of the EOS. Sacral slope (SS) and pelvic tilt (PT) as parameters to judge patient’s pelvic alignments by spinal surgeons, and anterior pelvic (APP) angle as a reference to decide patient’s pelvic alignments by hip surgeons were measured with the EOS software. The values of SS and PT and APP angle were compared in the phantom rotation and inclination. Results: PT showed small changes when the phantom was rotated, however, SS decreased and APP angle increased when the phantom was rotated. The values of SS and PT dispersed at 300 rotation among each inclination. APP angle dispersed at -15o and 30o of rotation among each inclination. Conclusion: Measurement variations of SS and PT were small amount under 15 degrees of rotation and inclination. On the contrary, APP angles showed greater variations when the phantom was rotated and inclined. Proper positioning of subjects, by reducing rotational effects, is important to get constant reproducible measurements, even if we use EOS system.

Spinopelvic Characteristics in Acetabular Retroversion: Does Pelvic Tilt Change After Periacetabular Osteotomy?

2019 ◽  
Vol 48 (1) ◽  
pp. 181-187 ◽  
Author(s):  
George Grammatopoulos ◽  
Saif Salih ◽  
Paul E. Beaule ◽  
Johan Witt
Keyword(s):  
Pelvic Tilt ◽  
Pelvic Incidence ◽  
Pelvic Ring ◽  
Periacetabular Osteotomy ◽  
Case Series ◽  
Acetabular Retroversion ◽  
Sacral Slope ◽  
Anterior Pelvic Plane ◽  
Level Of Evidence ◽  
Pelvic Position

Background: Acetabular retroversion may lead to impingement and pain, which can be treated with an anteverting periacetabular osteotomy (aPAO). Pelvic tilt influences acetabular orientation; as pelvic tilt angle reduces, acetabular version reduces. Thus, acetabular retroversion may be a deformity secondary to abnormal pelvic tilt (functional retroversion) or an anatomic deformity of the acetabulum and the innominate bone (pelvic ring). Purpose: To (1) measure the spinopelvic morphology in patients with acetabular retroversion and (2) assess whether pelvic tilt changes after successful anteverting PAO (aPAO), thus testing whether preoperative pelvic tilt was compensatory. Study Design: Case series; Level of evidence, 4. Methods: A consecutive cohort of 48 hips (42 patients; 30 ± 7 years [mean ± SD]) with acetabular retroversion that underwent successful aPAO was studied. Spinopelvic morphology (pelvic tilt, pelvic incidence, anterior pelvic plane, and sacral slope) was measured from computed tomography scans including the sacral end plate in 21 patients, with adequate images. In addition, the change in pelvic tilt with aPAO was measured via the sacrofemoral-pubic angle with supine pelvic radiographs at an interval of 2.5 ± 2 years. Results: The spinopelvic characteristics included a pelvic tilt of 4° ± 4°, a sacral slope of 39° ± 9°, an anterior pelvic plane angle of 11° ± 5°, and a pelvic incidence of 42° ± 10°. Preoperative pelvic tilt was 4° ± 4° and did not change postoperatively (4° ± 4°) ( P = .676). Conclusion: Pelvic tilt in acetabular retroversion was within normal parameters, illustrating “normal” sagittal pelvic balance and values similar to those reported in the literature in healthy subjects. In addition, it did not change after aPAO. Thus, acetabular retroversion was not secondary to a maladaptive pelvic tilt (functional retroversion). Further work is required to assess whether retroversion is a reflection of a pelvic morphological abnormality rather than an isolated acetabular abnormality. Treatment of acetabular retroversion should focus on correcting the deformity rather than attempting to change the functional pelvic position.

scholarly journals Iliopectineal line: A valuable radiological reference for spino-pelvic parameters

2021 ◽  
Vol 0 ◽  
pp. 1-6
Author(s):  
Abdul M Baco ◽  
Khalid Mukhter ◽  
Isam Moghamis ◽  
Nasser Mehrab ◽  
Mohamed A Alhabash ◽  
...  
Keyword(s):  
Pelvic Tilt ◽  
Center Of Mass ◽  
Reference Points ◽  
Sacral Slope ◽  
Cross Sectional ◽  
Digital Radiology ◽  
Pelvic Parameters ◽  
Radiological Images ◽  
Mass Displacement ◽  
Spinal Imbalance

Objectives: Spinopelvic parameters are crucial to address sagittal spinal imbalance; such measurements require standardized lateral radiographs that include spine and hips, which are neither always available, nor readily feasible intra-operatively. The aim of this study was to describe pelvic radiological reference points that could provide reliable sagittal balance estimates from conventional lumbosacral lateral radiographs. Methods: A descriptive, cross-sectional, radiological-based study was conducted. Readings were taken from institute’s digital radiology library, blinded to personal and clinical data. The correlation was made to conventional pelvic incidence (CPI), conventional pelvic tilt (CPT), and sacral slope (SS), measured for the same patients, and from the same standardized standing radiographs that included femoral heads. Results: Radiological images for 140 adult subjects, with suspected or established spine problems were studied. The average lumbar lordosis (LL) of 3 readers was 47 ± 13 (13–81) with an interclass agreement of 0.9, SS was 41 ± 9 with an interclass agreement of 0.9, CPI was 53 ± 10 with an interclass agreement of 0.8, CPT was 14 ± 8 with an interclass agreement of 0.9, iliopectineal inclination (IPI) of 4 readers was 64 ± 8 with an interclass agreement of 0.7 and iliopectineal tilt (IPT) was 24 ± 8 with an interclass agreement of 0.8 LL was with 6° of CPI and 16° of IPI. The CPI was equal to (CPI = SS + [CPT + 1.2]) and (IPI = SS + [IPT + 0.6]). The IPI was negatively correlated with CPI –0.2 P = 0.006, and IPI was negatively correlated with CPT –0.333 P < 0.001. Conclusion: Iliopectineal line provides reproducible readings, closer values to LL, and addresses the center of mass displacement.

Changes in Pelvic Incidence, Pelvic Tilt, and Sacral Slope in Situations of Pelvic Rotation

2017 ◽  
Vol 30 (7) ◽  
pp. E923-E930 ◽  
Author(s):  
Hai-Ming Jin ◽  
Dao-Liang Xu ◽  
Jun Xuan ◽  
Jiao-Xiang Chen ◽  
Kai Chen ◽  
...  
Keyword(s):  
Pelvic Tilt ◽  
Pelvic Incidence ◽  
Sacral Slope ◽  
Pelvic Rotation

scholarly journals Correlation of tilt of the anterior pelvic plane angle with anatomical pelvic tilt and morphological configuration of the acetabulum in patients with developmental dysplasia of the hip: a cross-sectional study

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Norio Imai ◽  
Hayato Suzuki ◽  
Asami Nozaki ◽  
Yuki Hirano ◽  
Naoto Endo
Keyword(s):  
Pelvic Tilt ◽  
Pelvic Incidence ◽  
Developmental Dysplasia ◽  
Morphological Parameters ◽  
Plane Angle ◽  
Acetabular Anteversion ◽  
Anterior Pelvic Plane ◽  
Functional Parameters ◽  
Pelvic Parameters ◽  
Dysplasia Of The Hip

Abstract Background It was previously reported that pelvises with developmental dysplasia of the hip are tilted anteriorly, which increases bony coverage of the femoral head. This study aimed to investigate the correlation between anatomical parameters of the pelvis such as pelvic incidence and anatomical pelvic tilt and functional parameters of the spine and pelvis such as tilt of the anterior pelvic plane. Methods We examined 84 female patients with bilateral developmental dysplasia of the hip who had undergone curved periacetabular osteotomy at author’s institution. Radiographs of the thoracic to lumbar spines and the pelvis were obtained in the standing position to measure spino-pelvic parameters before surgery. Morphological parameters of the acetabulum such as the anterior center-edge (CE) angle, posterior CE angle, lateral CE angle, and acetabular anteversion were measured using a preoperative three-dimensional pelvic model reconstructed from computed tomography images. Pearson’s correlation analysis was conducted to evaluate the relationship of these parameters. Results With regard to correlations between pelvic incidence (PI) and other parameters, the sacral slope (SS) value (r = 0.666) was the highest among functional parameters and the anatomical-SS value (r = 0.789) was the highest among morphological parameters. There were moderate correlations of the anterior pelvic plane angle (APPA) with pelvic tilt (PT) (r = − 0.594) and anatomical-PT (r = 0.646). With regard to correlations between spino-pelvic parameters and bony morphological parameters of the acetabulum, there was a moderate correlation between anatomical-PT and acetabular anteversion (AA) (r = 0.424). There were moderate correlations of APPA with the anterior CE angle (r = − 0.478), posterior CE angle (r = 0.432), and AA (r = 0.565). APPA had a stronger correlation with anatomical-PT (r = 0.646) than with AA. Conclusions The tilt of the pelvis may be more dependent on anatomical-PT, a morphological parameter of the pelvis, than the lateral CE angle, anterior CE angle, posterior CE angle, and acetabular anteversion on bony coverage of the acetabulum. This study is the first to investigate the correlation between functional parameters of the pelvis and spine and morphological parameters of the pelvis and acetabulum besides PI.

scholarly journals Relationship between pelvic morphology and functional parameters in standing position for patient-specific cup planning in THA

10.29007/41f9 ◽  
2018 ◽  
Author(s):  
Maximilian Fischer ◽  
Stephanie Schörner ◽  
Stefan Rohde ◽  
Christian Lüring ◽  
Klaus Radermacher
Keyword(s):  
Pelvic Tilt ◽  
Planning Process ◽  
Pelvic Incidence ◽  
Pubic Symphysis ◽  
Standing Position ◽  
Patient Specific ◽  
Automatic Process ◽  
Sacral Slope ◽  
Functional Parameters ◽  
Eos Imaging

The sagittal orientation of the pelvis commonly called pelvic tilt has an effect on the orientation of the cup in total hip arthroplasty (THA). Pelvic tilt is different between individuals and changes during activities of daily living. In particular, the pelvic tilt in standing position should be considered during the planning of THA to adapt the target angles of the cup patient-specifically to minimize wear and the risk of dislocation. Methods to measure pelvic tilt require an additional step in the planning process, may be time consuming and additional devices or x-ray imaging are necessary.In this study, the relationship between three functional parameters describing the sagittal pelvic orientation in standing position and seven morphological parameters of the pelvis was investigated. Correlations might be used to estimate the pelvic tilt in standing position by the morphology of the pelvis in order to avoid additional measuring techniques of pelvic tilt in the planning process of THA. For 18 subjects a semi-automatic process was established to match a 3D-reconstruction of the pelvis from CT scans to orthogonal EOS imaging in standing position and to calculate the morphological and functional parameters of the pelvis subsequently.The two strongest correlations of the linear correlation analysis were observed between morphological pelvic incidence and functional sacral slope (r = 0.78; p = 0.0001) and between morphological pubic symphysis-posterior superior iliac spines- ratio and functional tilt of anterior pelvic plane (r = -0.59; p = 0.0098). The results of this study suggest that patient-specific adjustments to the orientation of the cup in planning of THA without additional measurement of the sagittal pelvic orientation in standing position should be based on the correlation between morphological pelvic incidence and functional sacral slope.

Influence of Pelvic Rotation on Pelvic Incidence, Pelvic Tilt, and Sacral Slope

Spine ◽  
2014 ◽  
Vol 39 (21) ◽  
pp. E1276-E1283 ◽  
Author(s):  
Marcin Tyrakowski ◽  
Dominika Wojtera-Tyrakowska ◽  
Kris Siemionow
Keyword(s):  
Pelvic Tilt ◽  
Pelvic Incidence ◽  
Sacral Slope ◽  
Pelvic Rotation

scholarly journals D.C. Magnetron Sputtering Coating on Trenches

2021 ◽  
Vol 16 (1) ◽  
pp. 029-031
Author(s):  
Srikumaran V
Keyword(s):  
Aspect Ratio ◽  
Cutting Tools ◽  
Electron Beam Evaporation ◽  
Complex Surfaces ◽  
X Ray ◽  
Hardness Tester ◽  
Uniform Coating ◽  
Stepper Motors ◽  
Axis Rotation ◽  
Angle Of Rotation

The development and application of plasma processing such as plasma assisted CVD and PVD become highly important in various industrial fields such as microelectronics, sensors, solar cells, automobiles, cutting tools, etc.  In PVD different process are used such as Vacuum Evaporation, Electron Beam evaporation, Sputtering etc. But all processes have common limitation of one as such deposition is inline sight. It is difficult to achieve uniform coating on complex surfaces, holes and trenches. The width dimension and higher aspect ratio (Depth: width >1) of trenches generally in compatible with sputter deposition. When aspect ratio is increased, undesirable discontinuity can be observed at the lower half compared to upper half of trenches.  So that 3 axis rotation of substrate holder was designed with a stepper motors to get uniform coating on complex surfaces and holes. The angle of rotation and the speed are controlled by programmed micro controller. By positioning the surface features perpendicular to the plasma the holes, grooves are coated uniformly. The coating was characterized using X-ray diffractometer, SEM and micro hardness tester.

scholarly journals Sagittal spinal morphotype assessment in 8 to 15 years old Inline Hockey players

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e8229 ◽  
Author(s):  
Pilar Sainz de Baranda ◽  
Antonio Cejudo ◽  
Victor Jesus Moreno-Alcaraz ◽  
Maria Teresa Martinez-Romero ◽  
Alba Aparicio-Sarmiento ◽  
...  
Keyword(s):  
Thoracic Kyphosis ◽  
Pelvic Tilt ◽  
Joint Angle ◽  
Standing Position ◽  
Lumbar Curve ◽  
Young Athletes ◽  
Spinal Curvatures ◽  
Hockey Players ◽  
Thoracic Hyperkyphosis ◽  
And Performance

Background Physiological sagittal spinal curvatures play an important role in health and performance in sports. For that reason, several scientific studies have assessed spinal morphology in young athletes. However, to our knowledge, no study has assessed the implications of Inline Hockey (IH) practice on sagittal integrative spinal morphotype in adolescent players. Objectives The aims of the present study were to describe habitual sagittal spinal posture in young federated IH players and its relationship with training load and to determine the sagittal integrative spinal morphotype in these players. Methods An observational analysis was developed to describe the sagittal spinal morphotype in young federated IH players. A total of 74 IH players from the Technification Plan organized by the Skating Federation of the Valencian Community (aged from 8 to 15 years) participated in the study. Thoracic and lumbar curvatures of the spine were measured in a relaxed standing position (SP), in a slump sitting position (SSP) and in maximum flexion of the trunk (MFT) to determine the “Sagittal Integrative Morphotype” of all players. An unilevel inclinometer was used to quantify the sagittal spinal curvatures. The Hip Joint Angle test was used to quantify the Lumbo-Horizontal angle in flexion (L-H fx) of all participants with a goniometer. Results When thoracic curvature was analyzed according to normality references, it was found that 64.9% of IH players had thoracic hyperkyphosis in a SSP, while 60.8% and 74.3% of players were classified as normal in a SP and in MFT, respectively. As for the lumbar curve, 89.2% in a SP and 55.4% in MFT were normal, whereas 68.9% of IH players presented lumbar hyperkyphosis in a SSP. Regarding the “Sagittal Integrative Morphotype,” only 17.6% of players were classified as “Normal” in the three measured positions for the thoracic curve, while 37.8% had “Thoracic Hyperkyphosis” and 41.8% presented “Functional Thoracic Hyperkyphosis.” As for the “Sagittal Integrative Lumbar Morphotype,” only 23% of athletes had a normal curve in the three positions, whereas 66.2% presented “Functional Lumbar Hyperkyphosis.” When the L-H fx was evaluated, the results showed that only 16.2% of the athletes were classified as normal. Conclusions Federative IH practice seems to cause specific adaptations in spinal sagittal morphotype. Taking into account the “Sagittal Integrative Morphotype” only 17.6% IH players presented “Normal Morphotype” with a normal thoracic kyphosis in the three measured positions, while only 23% IH players presented “Normal Morphotype” with a normal lumbar curvature in the three assessed positions. Furthermore, only 16.2% of IH players showed normal pelvic tilt. Exercise programs to prevent or rehabilitate these imbalances in young IH players are needed.

Effect of pelvic tilt and rotation on cup orientation in standing anteroposterior radiographs

2019 ◽  
Vol 30 (1) ◽  
pp. 48-55 ◽  
Author(s):  
Ho Hyun Yun ◽  
William S Murphy ◽  
Daniel M Ward ◽  
Guoyan Zheng ◽  
Brett Hayden ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Pelvic Tilt ◽  
Patient Specific ◽  
Pelvic Rotation ◽  
3 Dimensional ◽  
Radiographic Measurements ◽  
Wide Variability ◽  
The Difference ◽  
The Right ◽  
Cup Positioning

Background: Individual pelvic tilt and rotation have wide variability that can affect the measurement of cup orientation in anteroposterior (AP) radiographs. The purpose of this study was to analyse the effect of pelvic tilt and rotation on radiographic measurements of cup orientation. Methods: A total of 53 patients (63 hips) were included in this study. The patients underwent a computed tomography study with standing AP pelvis radiographs taken both preoperatively and approximately 3 months postoperatively. We used 2-dimensional/3-dimensional matching to measure the pelvic tilt and rotation, and the non-standardised and standardised cup orientation. Results: There was no difference in the pelvic tilt and rotation between the preoperative and postoperative radiographs. The distribution of the differences between the non-standardised and standardised cup anteversion exhibited a change within 5° in only 34/63 (54%) hips. The pelvic tilt correlated with the difference between the non-standardised and standardised cup anteversion, but the pelvic rotation did not. When all 63 hips were separated into the right and left sides, the pelvic rotation inversely correlated with the pelvic tilt-adjusted difference between the non-standardised and standardised cup anteversion of the right side but directly correlated with that of the left side. Conclusions: The current study demonstrated that the measurement of cup anteversion in standing AP radiographs is significantly affected by both the pelvic tilt and pelvic rotation. An improved understanding of the pelvic orientation may eventually allow for desired cup positioning on a patient-specific basis to potentially reduce complications associated with the malposition of the cup.

Standardization of lateral pelvic radiograph is necessary to predict spinopelvic mobility accurately

2020 ◽  
Vol 102-B (7_Supple_B) ◽  
pp. 41-46 ◽  
Author(s):  
Michael Ransone ◽  
Keith Fehring ◽  
Thomas Fehring
Keyword(s):  
Pelvic Tilt ◽  
Preoperative Planning ◽  
Sacral Slope ◽  
Sitting Posture ◽  
Sit To Stand ◽  
Pelvic Radiograph ◽  
Increased Risk ◽  
Anterior Pelvic Tilt ◽  
B 41 ◽  
The Mean

Aims Patients with abnormal spinopelvic mobility are at increased risk for instability. Measuring the change in sacral slope (ΔSS) can help determine spinopelvic mobility preoperatively. Sacral slope (SS) should decrease at least 10° to demonstrate adequate posterior pelvic tilt. There is potential for different ΔSS measurements in the same patient based on sitting posture. The purpose of this study was to determine the effect of sitting posture on the ΔSS in patients undergoing total hip arthroplasty (THA). Methods In total, 51 patients undergoing THA were reviewed to quantify the variability in preoperative spinopelvic mobility when measuring two different sitting positions using SS for planning. Results A total of 32 patients had standardized relaxed sitting radiographs, while 35 patients had standardized flexed sitting images. Of the 32 patients with relaxed sitting views, the mean ΔSS was 20.7° (SD 8.9°). No patients exhibited an increase in SS during relaxed sitting (i.e. anterior pelvic tilt or so-called reverse accommodation). Of the 35 patients with flexed sitting radiographs, the mean ΔSS was only 2.1° (SD 9.7°) with 16/35 (45.71%) showing anterior pelvic tilt, or so-called reverse accommodation, unexpectedly increasing the sitting SS compared to the standing SS. Overall, 18 patients had both relaxed sitting and flexed sitting radiographs. In patients with both types of sitting radiographs, the mean relaxed sit to stand ΔSS was 18.06° (SD 6.07°), while only a 3.00° (SD 10.53°) ΔSS was noted when flexed sitting. There was a mean ΔSS difference of 15.06° (SD 7.67°) noted in the same patient cohort depending on sitting posture (p < 0.001). Conclusion A 15° mean difference was noted depending on the sitting posture of the patient. Since decisions on component position can be made on preoperative lateral sit-stand radiographs, postural standardization is crucial. If using ΔSS for preoperative planning, the relaxed sitting radiograph is preferred. Cite this article: Bone Joint J 2020;102-B(7 Supple B):41–46.

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