Spine deformity最新文献

{"title":"A modified position for optimized skeletal maturity assessment of AIS patients and its impact on 3D spinal and pelvic parameters.","authors":"Victoria Blouin, Victor Jullien, Olivier Chémaly, Marjolaine Roy-Beaudry, Sylvain Deschênes, Soraya Barchi, Marie-Lyne Nault, John M Flynn, Stefan Parent","doi":"10.1007/s43390-024-00903-1","DOIUrl":"10.1007/s43390-024-00903-1","url":null,"abstract":"<p><strong>Purpose: </strong>A hands-on-wall (HOW) position for low-dose stereoradiography of adolescent idiopathic scoliosis (AIS) patients would allow for skeletal maturity assessment of the hand and wrist. Our aims were twofold: confirm the reliability and validity of skeletal maturity assessment using the HOW radiographs and compare the spinal and pelvic 3D parameters to those of standard hands-on-cheeks (HOC) stereoradiographs.</p><p><strong>Methods: </strong>Seventy AIS patients underwent two successive stereoradiographs and a standard hand and wrist radiograph on the same day. Patients were randomly assigned to begin with HOW and follow with HOC, or vice versa. Raters assessed digital skeletal age (DSA), Sanders Simplified Skeletal Maturity (SSMS) and Thumb Ossification Composite Index (TOCI). 3D reconstructions of the spine and pelvis bones were performed for each stereoradiograph to measure nine clinically relevant spinal and pelvic 3D parameters.</p><p><strong>Results: </strong>Inter-rater and intra-rater reliabilities were excellent for DSA, SSMS and TOCI with both standard radiographs and HOW (ICC > 0.95). Strong correlation was found between ratings of both imaging types (ICC > 0.95). In the 3D reconstructions, kyphosis and sacral slope were slightly decreased in the HOW position, but within the clinical margin of error. All other parameters did not differ significantly between positions (p < 0.05).</p><p><strong>Conclusion: </strong>The results suggest that HOW stereoradiographs allow clinicians to assess skeletal maturity of the hand and wrist with adequate reliability and validity. We recommend that scoliosis clinics adopt the HOW position to assess skeletal maturity because there is no significant clinical impact on the spinal and pelvic evaluation, and on radiation exposure, cost or time.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":"1639-1645"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141179215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"18th International Congress on Early Onset Scoliosis and the Growing Spine : November 13-15, 2024 Scottsdale, Arizona, USA.","authors":"","doi":"10.1007/s43390-024-00972-2","DOIUrl":"10.1007/s43390-024-00972-2","url":null,"abstract":"","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":"1-32"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142583746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bipolar hybrid posterior instrumentation tecnique for the correction of Scheuermann's kyphosis.","authors":"María Coro Solans Lopez, Jose María Hernández Mateo, Alejandro Barrios Ayuso, Cristina Igualada Blázquez, Tania Quevedo Narciso, Azucena García Martín, Oscar Gabriel Riquelme García, Luis Alejandro Esparragoza Cabrera","doi":"10.1007/s43390-024-00928-6","DOIUrl":"10.1007/s43390-024-00928-6","url":null,"abstract":"<p><p>Scheuermann´s kyphosis (SK) is the most common cause of painful and progressive structural hyperkyphosis in adolescents. Surgical treatment should be considered in cases of refractory pain or progressive deformities. We present the clinical and radiological results obtained using a bipolar, hybrid posterior instrumentation tecnique. We analysed 12 males and 6 females, with mean age of 15.8 years. Minimum follow-up was 2 years. We used transverse process hooks at the cranial level and polyaxial screws for the remaining levels. We did not instrument the periapical segment. We used the sagittal stable vertebra (SSV) as the lower instrumented vertebra (LIV) in most cases, the \"barely touched SSV\" if the above disc space is lordotic. The mean preoperative kyphosis was 73.6º, mean postoperative kyphosis 44.7º, and mean correction of 28.9º (p = 0.0002). The mean reduction in lumbar lordosis (LL) was 8.9º (p = 0.0018). There were no significant differences in the spinopelvic parameters or sagittal balance. The mean number of instrumented levels was 8.9. Type II osteotomies were necessary in only three patients. Three patients had a cranial sagittal angle greater than 10°, all of them asymptomatic. Postoperatively, all patients had VAS scores less than 2 and SRS-22 scores greater than 4. Hybrid bipolar posterior instrumentation offers adequate curve correction, less operative time, implant density, bleeding, material protrusion and risk of spinal cord injury, leaving a large periapical bed for graft supply. We propose to measure the flexibility of the curve in MRI. In flexible curves (those that correct at least 20% in the supine decubitus position), wide facetectomies offer adequate correction of the deformity.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":"1751-1759"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141724421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving prediction of progression of idiopathic scoliosis based on curve size and skeletal maturity.","authors":"Kevin M Neal, Melanie Boeyer, Emily C Craver, Julia E Crook, Gary M Kiebzak","doi":"10.1007/s43390-024-00939-3","DOIUrl":"10.1007/s43390-024-00939-3","url":null,"abstract":"<p><strong>Purpose: </strong>To define the risk of curve progression of idiopathic scoliosis (IS) to 35°, 40°, 45°, and 50° based on current curve magnitude and Sanders stage for boys and girls, using a large cohort of patients and encounters, to improve granularity and allow more accurate estimations to guide treatment.</p><p><strong>Methods: </strong>Retrospective analysis of a prospectively collected scoliosis database. Generalized estimation equation logistic regression models estimated probabilities of curve progression to 35°, 40°, 45°, and 50° based on starting curve size and Sanders stage. Probabilities and their 95% confidence intervals were calculated for each combination of variables to each endpoint separately for boys and girls.</p><p><strong>Results: </strong>A total of 309 patients (80% girls) were included. Starting curve size and Sanders stage were significant predictors for progression in both sexes (all P ≤ 0.04). Higher starting curve sizes and lower Sanders stages were associated with greater odds of progression. Risk of progression was still present even at higher Sanders stages.</p><p><strong>Conclusion: </strong>IS curves follow a predictable pattern, having more risk for progression when curves are larger and Sanders stages are smaller. Risk of curve progression is a spectrum based on these factors, indicating some risk of progression exists even for many smaller curves with higher Sanders stages. The improved granularity of this analysis compared to prior efforts may be useful for counseling patients about the risks of curve progression to various curve size endpoints and may aid shared decision-making regarding treatments.</p><p><strong>Level of evidence or clinical relevance: </strong>Level III: retrospective cohort study.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":"1657-1665"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141971810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Growth modulation response in vertebral body tethering depends primarily on magnitude of concave vertebral body growth.","authors":"Craig R Louer, Vidyadhar V Upasani, Jennifer K Hurry, Hui Nian, Christine L Farnsworth, Peter O Newton, Stefan Parent, Ron El-Hawary","doi":"10.1007/s43390-024-00909-9","DOIUrl":"10.1007/s43390-024-00909-9","url":null,"abstract":"<p><strong>Purpose: </strong>There is variability in clinical outcomes with vertebral body tethering (VBT) partly due to a limited understanding of the growth modulation (GM) response. We used the largest sample of patients with 3D spine reconstructions to characterize the vertebra and disc morphologic changes that accompany growth modulation during the first two years following VBT.</p><p><strong>Methods: </strong>A multicenter registry was used to identify idiopathic scoliosis patients who underwent VBT with 2 years of follow-up. Calibrated biplanar X-rays obtained at longitudinal timepoints underwent 3D reconstruction to obtain precision morphological measurements. GM was defined as change in instrumented coronal angulation from post-op to 2-years.</p><p><strong>Results: </strong>Fifty patients (mean age: 12.5 ± 1.3yrs) were analyzed over a mean of 27.7 months. GM was positively correlated with concave vertebra height growth (r = 0.57, p < 0.001), 3D spine length growth (r = 0.36, p = 0.008), and decreased convex disc height (r = - 0.42, p = 0.002). High modulators (patients experiencing GM > 10°) experienced an additional 1.6 mm (229% increase) of mean concave vertebra growth during study period compared to the Poor Modulators (GM < - 10°) group, (2.3 vs. 0.7 mm, p = 0.039), while convex vertebra height growth was similar (1.3 vs. 1.4 mm, p = 0.91).</p><p><strong>Conclusion: </strong>When successful, VBT enables asymmetric vertebra body growth, leading to continued postoperative coronal angulation correction (GM). A strong GM response is correlated with concave vertebral body height growth and overall instrumented spine growth. A poor GM response is associated with an increase in convex disc height (suspected tether rupture). Future studies will investigate the patient and technique-specific factors that influence increased growth remodeling.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":"1689-1698"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11499367/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141248498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characteristics of sagittal spinopelvic alignment in Thai population: a cross-sectional study.","authors":"Tinnakorn Pluemvitayaporn, Wachirawit Penrat, Sombat Kunakornsawat, Suttinont Surapuchong, Warot Ratanakoosakul, Kitjapat Tiracharnvut, Chaiwat Piyasakulkaew, Piyabuth Kittithamvongs","doi":"10.1007/s43390-024-00997-7","DOIUrl":"https://doi.org/10.1007/s43390-024-00997-7","url":null,"abstract":"<p><strong>Background: </strong>The prevalence of spinal deformity is a significant health concern often associated with the aging process. It is primarily attributed to the thickening of spinal joints, ligament pathologies, or the narrowing of the spinal canal, leading to compression of the spinal cord and nerve roots, and subsequently causing musculoskeletal problems. When considering corrective surgery for adult spinal deformities, it is crucial for spine surgeons to take into account the standard values of sagittal spinopelvic alignment. Notably, there is currently a lack of specific data on this aspect within the Thai population. Therefore, our study was focused on evaluating the alignment in the Thai population.</p><p><strong>Objectives: </strong>To analyze sagittal spinopelvic alignment parameters in the asymptomatic Thai population and compare them with other populations.</p><p><strong>Materials and methods: </strong>This study was designed as a cross-sectional analysis involving 194 participants, wherein the sagittal spinopelvic parameters were evaluated utilizing radiographic images. The measurements of the sagittal vertical axis (SVA), pelvic incidence (PI), lumbar lordosis (LL), sacral slope (SS), and pelvic tilt (PT) were determined by averaging the assessments conducted by two orthopedic residents and a spine surgeon. In addition, participants' demographic information was obtained through questionnaires, and further analysis was performed on age, gender, and body mass index data. The study also encompassed the determination of correlations between various parameters and the comparison of these parameters with other populations.</p><p><strong>Results: </strong>The body mass index (BMI) of the study participants demonstrated significant associations with several spinal parameters. Specifically, BMI showed significant correlations with sagittal vertical axis (SVA) (r = 0.2, p = 0.09), pelvic incidence (PI) (r = 0.4, p < 0.01), lumbar lordosis (LL) (r = 0.2, p = 0.02), sacral slope (SS) (r = -0.2, p = 0.02), and pelvic tilt (PT) (r = 0.2, p = 0.02). The SS exhibited a statistically significant decline with increasing age (p = 0.04). Furthermore, the mean SVA, PI, LL, SS, and PT differed significantly between the study participants and the Indian population. In addition, the SS was notably lower when compared to the European population.</p><p><strong>Conclusion: </strong>The study revealed the spinopelvic parameters in a cohort of healthy Thai population and observed a correlation between their body mass index (BMI) and pelvic incidence (PI), lumbar lordosis (LL), sacral slope (SS), and pelvic tilt (PT). Notably, the average SS among Thai adults was found to be statistically lower than that of individuals from Indian, European Caucasian, Asian, and Mexican populations. These insights hold potential value as a reference when strategizing surgical interventions for Thai patients with spinal deformities.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142558725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Role of spinal MRI for pre-operative work up in patients with adolescent idiopathic scoliosis: a retrospective case study and narrative review.","authors":"Sassan Keshavarzi, Griffin Harris, Subaraman Ramchandran, Noah Gabor, Jeffrey Spardy, Thomas Errico, John Ragheb, Stephen George","doi":"10.1007/s43390-024-00991-z","DOIUrl":"https://doi.org/10.1007/s43390-024-00991-z","url":null,"abstract":"<p><strong>Introduction: </strong>There remains variability in the acquisition of whole-spine MRI prior to surgical correction in patients with adolescent idiopathic scoliosis (AIS). In this study, we take a retrospective look at the clinical impact of uniformly obtaining spinal MRI on all patients with a diagnosis of AIS.</p><p><strong>Methods: </strong>Three hundred thirty four patients with presumed AIS who underwent surgery between 2017 and 2022 were identified; 283 of these patients who were asymptomatic and had a preoperative MRI in the database were included. We investigated radiographic, demographic, and clinical risk factors for the presence of neural axis anomalies. Radiologists' reports were reviewed to determine the level of the conus medullaris and the presence of any intra-spinal dysraphisms. The utility of known risk factors for neural axis anomalies and the utility of MRI identifying anomalies on clinical decision-making, intra-operative neuromonitoring (IONM) alerts, and postoperative neurologic insult in asymptomatic AIS patients were investigated.</p><p><strong>Results: </strong>There were 283 patients with a mean age of 14.1 years, 67 males (22.6%) and 26 (9.2%) left-sided thoracic curves. MRI identified nine patients with central cord dilations, four patients with low cerebellar tonsils, four patients with Chiari Malformations, five patients with low-lying conus, one patient with a tethered cord, and five patients with arachnoid cysts. Six (2.1%) of the 283 patients underwent a neurosurgical intervention and 3 (50%) of the 6 went on to have IONM alerts. Eighteen (6.4%) of the 283 patients had IONM alerts and 5 (28%) of the 18 had neural axis anomalies. None of the patients with IONM alerts had a permanent neurologic deficit post-operatively.</p><p><strong>Conclusion: </strong>In asymptomatic patients presumed to have AIS, 9.9% had a neuro-axis anomaly, 2.1% needed a neurosurgical intervention, and 6.4% of the patients had an IONM alert. We did not find known risk factors for identifying neural axis anomalies to have statistically significant application in asymptomatic AIS patients. Presence of neuroaxis anomalies increased the chance of having IONM alerts, however, we were unable to demonstrate if neurosurgical interventions in these patients with anomalies were preventative for IONM alerts or have statistically significant protection against clinical complications.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142547240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spine deformity surgery in patients with Beals syndrome can be effectively performed but does risk revision surgery.","authors":"Anne-Marie Datcu, David Thornberg, Anna Booth, Daniel J Sucato","doi":"10.1007/s43390-024-00993-x","DOIUrl":"https://doi.org/10.1007/s43390-024-00993-x","url":null,"abstract":"<p><strong>Purpose: </strong>Beals syndrome or congenital contractual arachnodactyly is a rare disorder characterized by multiple joint contractures, Marfanoid body habitus and crumpled ears and has been associated with scoliosis. This study reports a clinical series of patients with Beals syndrome who have had surgical treatment for their spinal deformity.</p><p><strong>Methods: </strong>A retrospective review of all patients at a single institution who had a genetically-confirmed diagnosis of Beals syndrome and had surgical treatment for their scoliosis were reviewed for surgical outcome and complications.</p><p><strong>Results: </strong>There were eight patients who had surgery at an average age of 11.5 years, four were female and four had cardiovascular abnormalities requiring treatment. The preoperative coronal Cobb was 82.3° which improved to 42.1°(46.8% correction), and 46.5° (43.5% correction) at final follow-up. Preoperative halo-gravity-traction was used in three patients. Three patients had a posterior instrumentation and fusion (PSFI), 2 a combined anterior/PSFI, 1 had tethering, 1 with PSFI with posteriorly-approached discectomy, and 1 with a PSFI and vertebral column resection. One of the eight patients had a critical intraoperative neuromonitoring event but was normal following appropriate responses and no patient awoke with neurologic deficits. Two had an unplanned return to the operating room for implant dislodgement and each had a successful revision.</p><p><strong>Conclusions: </strong>Scoliosis associated with Beals syndrome can have large curves at the time of surgery and require a variety of surgical approaches to achieve a good result. Revision surgery with return to the operating room is necessary in 25% of patients.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142522891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Elevated hospital floor-based HDU (POPUP-HDU): a new safe alternative to PICU for high-risk neuromuscular and syndromic children undergoing scoliosis surgery.","authors":"E Bada, J Gouda, M D Sewell, M Jones, G McKay, N Canchi-Murali, J B Spilsbury, D S Marks, A Gardner, J S Mehta","doi":"10.1007/s43390-024-00992-y","DOIUrl":"https://doi.org/10.1007/s43390-024-00992-y","url":null,"abstract":"<p><strong>Purpose: </strong>Children undergoing either posterior spinal fusion (PSF) or index insertion of growing rods for neuromuscular or genetic/syndromic scoliosis may require post-operative care on the paediatric intensive care unit (PICU). Demands on this limited resource result in frequent bed shortage related cancellations. In response, an ad-hoc or 'pop-up' ward-based high-dependency unit (POPUP-HDU) was developed. This converts a ward bed to POP-HDU bed for the required time. This study assesses the safety and efficacy of postoperative management that utilises POPUP-HDU as an alternative to a PICU bed.</p><p><strong>Methods: </strong>Retrospective review of 111 consecutive children undergoing posterior surgery for scoliosis between June 2016 and April 2023. The inclusion criteria included a diagnosis of genetic/syndromic or neuromuscular scoliosis; PSF or primary insertion of distraction-based growth rods and requirement for postoperative care in a PICU. We excluded those children that were mandated to go to PICU post-operatively for any reason by the anaesthetic team.</p><p><strong>Results: </strong>49 patients (mean age 13.0 years) were managed on PICU, and 62 (mean age 11.4 years) on POPUP-HDU. The groups were matched with respect to body weight, curve magnitude, operative duration, type of fusion procedure performed, the presence of cardiac malformations, the use of home breathing support, the number of operated levels, pelvic instrumentation and intraoperative blood loss. 8 patients in the PICU, and 16 in the POP-HDU groups were readmitted back to PICU following step-down to the hospital ward (p = 0.27). The median PICU length of stay was 1 day in the PICU group and less than a day in POPUP-HDU (for those that needed to be subsequently admitted to PICU). The median total length of hospital stay was 10 days in the PICU group, and 8 days in POPUP-HDU (p < 0.05). 14 patients developed medical complications in the PICU group, compared to 19 in POPUP-HDU. There were no bedshortage cancellations in POPUP-HDU, compared to 23 in PICU.</p><p><strong>Conclusions: </strong>For children with neuromuscular, genetic or syndromic scoliosis undergoing PSF or growth rods that are not deemed suitable for immediate ward-level post-operative care, POPUP-HDU provided a safe alternative to PICU for appropriate patients and was associated with shorter hospital stay and fewer cancellations for lack of PICU beds.</p><p><strong>Level of evidence: </strong>Therapeutic Level III.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142507400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anatomical landmark detection on bi-planar radiographs for predicting spinopelvic parameters.","authors":"Stefan Lang, Moritz Jokeit, Ji Hyun Kim, Lukas Urbanschitz, Luca Fisler, Carlos Torrez, Frédéric Cornaz, Jess G Snedeker, Mazda Farshad, Jonas Widmer","doi":"10.1007/s43390-024-00990-0","DOIUrl":"https://doi.org/10.1007/s43390-024-00990-0","url":null,"abstract":"<p><strong>Introduction: </strong>Accurate landmark detection is essential for precise analysis of anatomical structures, supporting diagnosis, treatment planning, and monitoring in patients with spinal deformities. Conventional methods rely on laborious landmark identification by medical experts, which motivates automation. The proposed deep learning pipeline processes bi-planar radiographs to determine spinopelvic parameters and Cobb angles without manual supervision.</p><p><strong>Methods: </strong>The dataset used for training and evaluation consisted of 555 bi-planar radiographs from un-instrumented patients, which were manually annotated by medical professionals. The pipeline performed a pre-processing step to determine regions of interest, including the cervical spine, thoracolumbar spine, sacrum, and pelvis. For each ROI, a segmentation network was trained to identify vertebral bodies and pelvic landmarks. The U-Net architecture was trained on 455 bi-planar radiographs using binary cross-entropy loss. The post-processing algorithm determined spinal alignment and angular parameters based on the segmentation output. We evaluated the pipeline on a test set of 100 previously unseen bi-planar radiographs, using the mean absolute difference between annotated and predicted landmarks as the performance metric. The spinopelvic parameter predictions of the pipeline were compared to the measurements of two experienced medical professionals using intraclass correlation coefficient (ICC) and mean absolute deviation (MAD).</p><p><strong>Results: </strong>The pipeline was able to successfully predict the Cobb angles in 61% of all test cases and achieved mean absolute differences of 3.3° (3.6°) and averaged ICC of 0.88. For thoracic kyphosis, lumbar lordosis, sagittal vertical axis, sacral slope, pelvic tilt, and pelvic incidence, the pipeline produced reasonable outputs in 69%, 58%, 86%, 85%, 84%, and 84% of the cases. The MAD was 5.6° (7.8°), 4.7° (4.3°), 2.8 mm (3.0 mm), 4.5° (7.2°), 1.8° (1.8°), and 5.3° (7.7°), while the ICC was measured at 0.69, 0.82, 0.99, 0.61, 0.96, and 0.70, respectively.</p><p><strong>Conclusion: </strong>Despite limitations in patients with severe pathologies and high BMI, the pipeline automatically predicted coronal and sagittal spinopelvic parameters, which has the potential to simplify clinical routines and large-scale retrospective data analysis.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142507397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}