Spine deformity最新文献

{"title":"Axial rod slip at the end-of-construct screw in scoliosis surgery: relevance, occurrence and prevention.","authors":"T P Schlösser, I Blaauw, M R van der Valk, Guido van Solinge, C Faber, M C Kruyt","doi":"10.1007/s43390-024-00925-9","DOIUrl":"10.1007/s43390-024-00925-9","url":null,"abstract":"<p><strong>Purpose: </strong>Despite standardized biomechanical tests for spinal implants, we recently recognized pedicle screw failure to maintain the rod fixated as a clinical concern in scoliosis surgery. This occurrence study investigates the risk and magnitude of axial rod slip (ARS), its relation with technique and preventive measures.</p><p><strong>Methods: </strong>Retrospective multicenter review of all primary scoliosis cases (2018-2020) with > 1 year FU from three centers, instrumented with uniplanar screws and 5.5 mm CoCr rods (Mesa 2, Stryker Corporation, Kalamazoo, MI, USA). ARS was defined as > 1 mm change in residual distal rod length from the screw in the lowest instrumented vertebra (LIV) and assessed by two independent observers. Slip distance, direction, relation to distal screw density and time of observation were recorded, as well as the effect of ARS on caudal curve increase. To prevent slip, more recent patients were instrumented with a different end-of-construct screw (Reline, NuVasive Inc. San Diego, CA, USA) and analyzed for comparison.</p><p><strong>Results: </strong>ARS risk was 27% (56/205) with a distance of 3.6 ± 2.2 mm, predominantly convex. 42% occurred before 4 months, the rest before 1 year. The caudal curve substantially increased three times more often in patients with ARS. Interobserver reliability was high and slip was in the expected direction. ARS was unrelated to distal screw density. Remarkable variation in ARS rates (53%, 31%, 13%) existed between the centers, while there was no difference in mean screw density (≈1.3 screws/level) or curve correction (≈60%). Revision surgery for ARS was required in 2.9% (6/207). Using the different end-of-construct screw, ARS risk was only 2% (1/56) and no revisions were required.</p><p><strong>Conclusion: </strong>This study demonstrates the prevalence of axial rod slip at the end of construct in scoliosis surgery and its clinical relevance. While minimal ARS can be subclinical, ARS should not be mistaken for adding on. The most severe ARS predominantly occurred convex at the high-loaded distal screw when L3 was the LIV. Longer constructs (LIV L3 or L4) have a higher risk of ARS. The minimal risk of ARS with another end-of-construct screw underscores the influence of screw type on ARS occurrence in our series. Further research is essential to refine techniques and enhance patient outcomes.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":"1699-1707"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11499526/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142009405","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":"Maturation of the vertebral ring apophysis is delayed in girls with adolescent idiopathic scoliosis compared to the normal population.","authors":"Lorenzo Costa, Agnes van Lange, Peter R Seevinck, Winnie Chu, Ludvig Vavruch, Moyo C Kruyt, René M Castelein, Tom P C Schlosser","doi":"10.1007/s43390-024-00908-w","DOIUrl":"10.1007/s43390-024-00908-w","url":null,"abstract":"<p><strong>Purpose: </strong>The ring apophysis is a secondary ossification center on both sides of each vertebral body, to which the annulus of the intervertebral disc inserts. Recently, its pattern of ossification and fusion to the vertebral body was described for the normal growing spine. The aim of the present study was to investigate the ossification and fusion of the ring apophysis in patients with adolescent idiopathic scoliosis (AIS) and compare it to the normal growing population.</p><p><strong>Methods: </strong>Ring apophysis maturation along the entire thoracic and lumbar spine was analyzed on CT scans of 99 female, pre-operative AIS patients and compared to 134 CT scans of non-scoliotic girls, aged 12 to 20.</p><p><strong>Results: </strong>The ring apophysis maturation in AIS patients was delayed at all spinal levels in AIS patients compared to non-scoliotic controls. Ossification starts at T4-T11 at age 12, followed by T1-T5 and L3-S1 at age 15. The fusion process in AIS patients continues longer in the midthoracic region as compared to the other regions and as compared to non-scoliotic controls, with many incomplete fusions still at age 20.</p><p><strong>Conclusion: </strong>The ring apophysis maturation in AIS is delayed compared to that in the normal population and lasts longer in the mid/low thoracic spine. Delayed maturation of the spine's most important stabilizer, while the body's dimensions continue to increase, could be part of the patho-mechanism of AIS.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":"1631-1637"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11499316/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141288558","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":"Predicting brace holiday eligibility in juvenile idiopathic scoliosis.","authors":"Julianna Lee, Nathan Chaclas, Lucas Hauth, David VanEenenaam, Vineet Desai, John M Flynn","doi":"10.1007/s43390-024-00924-w","DOIUrl":"10.1007/s43390-024-00924-w","url":null,"abstract":"<p><strong>Purpose: </strong>The psychological effects of scoliosis bracing can be difficult, and thus clinicians sometimes recommend a brace holiday when the curve corrects to less than 25°. However, the clinical indications for taking a break from the brace before reaching maturity have yet to be described. We hypothesized there would be a relationship between brace holiday eligibility and degree of curve at presentation, change in curve magnitude while bracing, and level of bracing compliance.</p><p><strong>Methods: </strong>A retrospective cohort study at a single institution was performed from 2016 to 2022. Objective brace compliance I-button data were collected on patients aged 3-9 years old. Patients with other etiologies besides idiopathic scoliosis before the age of 10 were excluded. Binary logistic regression was performed to determine the effect of significant variables on the likelihood of brace holiday.</p><p><strong>Results: </strong>Fifty-six patients met inclusion criteria. Of these, 20 were able to get a brace holiday. Patients with higher brace compliance and larger in-brace curve correction were more likely to get a brace holiday (P = 0.015, 0.004). Patients with higher BMIs and larger curves at initial presentation were less likely to get a brace holiday (P = 0.002, 0.014).</p><p><strong>Conclusion: </strong>Compliant brace wearers with good in-brace correction are most likely to be eligible for a brace holiday. While some elements remain immutable, others are modifiable, such as bracing compliance. Understanding how outcomes differ between patients who do and do not take a brace holiday will be crucial to elucidating if the psychological benefit of taking a break from the brace can be justified.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":"1683-1687"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11499379/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141559639","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":"Proximal foundation anchor variations and their correlation with unplanned return to the operating room (UPROR) in children with EOS treated with magnetically controlled growing rods (MCGR).","authors":"Fernando Rios, Hazem B Elsebaie, Bahar Shahidi, Robert Ames, Bailee Monjazeb, William Kerr, Joshua M Pahys, Steven W Hwang, Amer F Samdani, Lindsay M Andras, Matthew E Oetgen, Peter O Newton, Burt Yaszay, Gregory M Mundis, Behrooz A Akbarnia","doi":"10.1007/s43390-024-00921-z","DOIUrl":"10.1007/s43390-024-00921-z","url":null,"abstract":"<p><strong>Introduction: </strong>The evolution of MCGR technique has led to modifications in the configuration of the proximal construct to decrease the incidence of implant-related complications (IRC) and revision surgeries. However, there is no data characterizing the performance of the most used configurations reducing the risk of complications.</p><p><strong>Methods: </strong>487 patients were identified from an international multicenter EOS database.</p><p><strong>Inclusion criteria: </strong>EOS patients, primary dual MCGR, complete radiographs, and minimum of 2-year follow-up. 76 patients had incomplete X-rays, 5 had apical fusions, and 18 had inconclusive complications, leaving 388 patients for review. A digital spine template was created to document UIV; number of levels; number, type, and location of anchors; as well as implant configuration. First available postoperative and latest follow-up radiographs were reviewed by two senior surgeons and two spine fellows. UPROR due to IRC was defined as any change in proximal anchors between the postoperative and final follow-up radiographs.</p><p><strong>Results: </strong>The most common proximal construct configuration: UIV at T2 (50.0%) with 17.5% UPROR, followed by T3 (34.0%) with 12.1% UPROR; number of levels was three (57.1%) with 16.8% UPROR and two (26.0%) with 17.0% UPROR; number of proximal anchors was six (49.9%) with 14.1% UPROR and four (27.0%) with 18.3% UPROR. The most common anchors were all screws (42.0%) with 9.9% UPROR, and all hooks (26.4%) with 31.4% UPROR (P < 0.001). The construct with the lowest rate of UPROR was a UIV at T2, with six anchors (all screws) across three levels (42 cases), with 0% UPROR. Other construct combinations that yielded 0% UPROR rates were UIV of T3, six anchors (all screws) across three levels (25 cases), and a UIV of T3 with six anchors (screws and hooks) across three3 levels (9 cases).</p><p><strong>Conclusion: </strong>Proximal anchor configuration impacts the incidence of UPROR due to IRC in MCGR. UIV at T2 and T3 compared to T4, and the use of all screws or combination of screws and hooks compared to all hooks were associated with a lower UPROR rate. The most common construct configuration was T2 UIV, three levels, six anchors, and all screws. The use of a combination of six anchors (screws or screws and hooks) across three levels with a UIV at T2 or T3 was associated with a lower UPROR rate. Additional research is needed to further evaluate the variables contributing to configuration selection and their association with IRC.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":"1831-1839"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141601730","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":"Correlation of anterior chest wall anomalies and spinal deformities: a comprehensive descriptive study.","authors":"Serdar Şirazi, Ahmed Majid Heydar, Murat Bezer, Mustafa Yüksel","doi":"10.1007/s43390-024-00918-8","DOIUrl":"10.1007/s43390-024-00918-8","url":null,"abstract":"<p><strong>Purpose: </strong>To investigate the association and evaluate the characteristics between different types of anterior chest wall and spinal deformities.</p><p><strong>Methods: </strong>A total of 548 patients with anterior chest wall deformities were included in this study. Clinical and radiological examinations were performed to determine spinal deformities. The type and severity of the spinal deformities were evaluated and their relationships with chest wall deformity subtypes were statistically analyzed.</p><p><strong>Results: </strong>Spinal deformities were identified in 93 (16.97%) patients. The patients were subdivided into 71 (76.3%) male and 22 (23.7%) female patients. A spinal deformity was detected in 57 (13%) of 418 pectus excavatum (PE) patients, in 23 (19%) of 117 pectus carinatum (PC) patients, and in all patients with mixed pectus deformity (PE + PC), syndromic deformity and rib anomalies. In the PE group, scoliosis, and kyphosis were observed at 57.9 and 31.6%, respectively. In the PC group, these rates were 43.5 and 47.8%, respectively. Idiopathic scoliosis was observed in 42 (77.7%) and constituted the most common scoliosis subgroup. The main thoracic curvature was the most common curve pattern, which was observed in 15 (35.7%) patients with idiopathic scoliosis.</p><p><strong>Conclusions: </strong>Idiopathic scoliosis with main thoracic curvature is the most common deformity in patients with anterior chest wall deformity. Spinal deformities are more common in male patients with chest deformities. Kyphosis is found in a significant number of PE and PC patients. Patients with mixed PE and PC, rib anomalies, and syndromic disease are more likely to have spinal deformities.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":"1615-1622"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141427602","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":"COVID-19 significantly impacted initial consultation for idiopathic scoliosis.","authors":"Matias Pereira-Duarte, Julie Joncas, Hubert Labelle, Olivier Chémaly, Félix Brassard, Jean-Marc Mac-Thiong, Soraya Barchi, Stefan Parent","doi":"10.1007/s43390-024-00902-2","DOIUrl":"10.1007/s43390-024-00902-2","url":null,"abstract":"<p><strong>Introduction: </strong>Since the outbreak of the COVID-19 pandemic, reduction of social activities and rapid adoption of telemedicine, decreasing face-to-face encounters seems to have negatively affected the timely Idiopathic Scoliosis (IS) referral with a spine specialist. We aim to document the progression of IS curves during COVID-19 pandemic reflected by the late presentation of patients at the initial visit with higher Cobb angles and to evaluate its influence on health-related quality of life scores.</p><p><strong>Materials and methods: </strong>All IS patients scheduled for surgery between April 2019 and September 2021 were recruited in a prospective cohort study. The patients were divided into five cohorts of 6 month duration each according to their booking date: 2 periods before the 1st COVID-19 wave, one period during and two periods afterwards. In each cohort, patients were divided into 3: those who were scheduled for posterior spinal fusion (PSF) at 1st visit, those booked for vertebral body tethering (VBT) at 1st visit, and those scheduled for surgery but who have failed brace treatment. Variables included age, gender, Risser grade and preoperative SRS-22 scores. Chi² and ANOVA tests were used for comparison.</p><p><strong>Results: </strong>173 patients were analyzed. 33 patients (13.1 ± 3 y.o.) were scheduled between Apr and Sept 2019; 38 (13.1 y.o. ± 2) between Oct 2019 and Mar 2020; 31 (13.4 ± 3 y.o.) between Apr and Sept 2020; 30 (14.3 ± 2 y.o.) between Sept 2020 and Mar 2021; and 41 patients (13.8 ± 2 y.o.) between Apr and Sept 2021. Non-statistically significant differences were found between periods before, during or after the COVID-19 first wave regarding patients' age, gender, Risser grade and SRS-22 scores. Average Cobb angles of patients at their 1st visit after the beginning of the COVID-19 pandemic were significantly higher than those before COVID-19 (52.2° ± 7° and 56.6° ± 13° vs 47.8° ± 12° and 45.2° ± 13°; p = 0.0001). More patients were booked for PSF (p < 0.0000) through the five evaluated periods, while the indication of VBT or surgery in patients previously braced progressively decreased.</p><p><strong>Conclusion: </strong>Patients presented at the scoliosis clinic for the 1st time after the 1st COVID-19 wave with significantly larger Cobb angles, and likely contributed to an increased proportion of PSF, as the potential window for bracing or VBT was missed due to a delayed consultation.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":"1675-1682"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141459298","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":"Association between underweight status or low body mass index and the risk of developing superior mesenteric artery syndrome following scoliosis corrective surgery in pediatric patients: a review of the literature.","authors":"Lyssa Lamport, Jon-Paul DiMauro, Stephani Johnson, Susan Roberts, Jane Ziegler","doi":"10.1007/s43390-024-00929-5","DOIUrl":"10.1007/s43390-024-00929-5","url":null,"abstract":"<p><p>Superior mesenteric artery (SMA) syndrome is the compression of the third portion of the duodenum between the abdominal aorta and the superior mesenteric artery. Although multifactorial, the most frequent cause of SMA syndrome is significant weight loss and cachexia often induced by catabolic stress. SMA syndrome resulting from scoliosis surgery is caused by a reduction of the aortomesenteric angle and distance. Risk factors include rapid weight loss, malnutrition, and a rapid reduction in the mesenteric fat pad and are the most common causes of a decrease in the aortomesenteric angle and distance. Surgically lengthening the vertebral column can also lead to a reduction of the aortomesenteric distance, therefore, has been identified as a risk factor unique to spinal surgery. Despite a reported decline in SMA syndrome cases due to improved surgical techniques, duodenal compression is still a risk and remains a life-threatening complication of scoliosis surgery. This article is a cumulative review of the evidence of being underweight or having a low body mass index as risk factors for developing SMA syndrome following surgical scoliosis instrumentation and correction.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":"1529-1543"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11499333/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141752554","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":"Low bone mineral density: a primer for the spine surgeon.","authors":"Micheal Raad, Andrew H Kim, Wesley M Durand, Khaled M Kebaish","doi":"10.1007/s43390-024-00913-z","DOIUrl":"10.1007/s43390-024-00913-z","url":null,"abstract":"<p><p>Within spinal surgery, low bone mineral density is associated with several postoperative complications, such as proximal junctional kyphosis, pseudoarthrosis, and screw loosening. Although modalities such as CT and MRI can be utilized to assess bone quality, DEXA scans, the \"Gold Standard\" for diagnosing osteoporosis, is not routinely included in preoperative workup. With an increasing prevalence of osteoporosis in an aging population, it is critical for spine surgeons to understand the importance of evaluating bone mineral density preoperatively to optimize postoperative outcomes. The purpose of this state-of-the-art review is to provide surgeons a summary of the evaluation, treatment, and implications of low bone mineral density in patients who are candidates for spine surgery.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":"1511-1520"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141767309","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":"In-hospital post-operative fever after posterior spinal fusion for neuromuscular scoliosis in non-ambulatory cerebral palsy patients: is there value for clinical workup for an isolated fever?","authors":"K Aaron Shaw, Joshua S Murphy, Ryan Koehler, Hilary Harris, Numera Sachwani, Robert Bruce, Dennis Devito, Michael Schmitz, Jorge Fabregas, Daniel Raftis, Just West, Nicholas Fletcher","doi":"10.1007/s43390-024-00930-y","DOIUrl":"10.1007/s43390-024-00930-y","url":null,"abstract":"<p><strong>Purpose: </strong>Children with neuromuscular scoliosis (NMS) resultant to cerebral palsy (CP) are at a heightened risk for complications following surgical treatment. These children have a reported 22-64% rate of post-operative fever development, and additional fever workup has been shown to have limited clinical utility. However, this has yet to be investigated in the setting of an accelerated discharge (AD) pathway.</p><p><strong>Methods: </strong>A retrospective review of children with non-ambulatory CP treated at 2 centers with posterior spinal fusion (PSF) for NMS was performed. One institution uses a standardized AD post-operative pathway for NMS patients, whereas the second institution had no standard pathway. A post-operative fever was defined as temperature > 38.5 °C. Target outcome variables included the development of a fever as well as re-admission within 90 days of surgery.</p><p><strong>Results: </strong>A total of 122 non-ambulatory children were identified (82% GMFCS V, mean 14.3 ± 3.4 years at surgery). A post-operative fever was documented in 75.4% of patients (N = 92) and all additional culture studies reported negative results. Children admitted to the PICU were more likely to undergo a fever workup (P < 0.001) and more likely to receive additional or extended antibiotic therapy (P < 0.001). Children treated at the AD pathway had a significantly lower rate of PICU admission (P < 0.001). Post-operative PICU admission was associated with a post-operative fever (49.5% vs 25%, P = 0.03).</p><p><strong>Conclusion: </strong>Non-ambulatory CP children with NMS undergoing PSF have a 75.4% rate of developing early post-operative fevers. Reflexive fever work-ups provided limited clinical utility while increasing the hospital length of stay and potentially exposing patients to antibiotic-related complications.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":"1745-1750"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141788980","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":"Validation of a new method for the radiological measurement of rod curvature in patients with spine deformity.","authors":"Daniel Larrieu, Alice Baroncini, Ayman Assi, Cecile Roscop, Louis Boissiere, Ibrahim Obeid","doi":"10.1007/s43390-024-00905-z","DOIUrl":"10.1007/s43390-024-00905-z","url":null,"abstract":"<p><strong>Purpose: </strong>The relationship between rod curvature and postoperative radiographic results is a debated topic. One of the reasons of the heterogeneity of the observed results might reside in the lack of a validated and widely employed method to measure the curvature of the rods. Aim of this study was to present and validate a novel method for rod measurement, which is based on routine X-rays and utilizes a regression algorithm that limits manual measurements and the related errors.</p><p><strong>Methods: </strong>Data from 20 adolescent idiopathic scoliosis/Scheuermann kyphosis (AIS/SK) patients and 35 adult spine deformity (ASD) patients for analysis, with 112 rods in total. An orthogonal reference grid was overlaid on the lateral X-ray; seven points were then marked along each rod and their coordinates recorded in a table. Using these coordinates, a third-order polynomial regression was applied to obtain the rod curvature equation (correlation coefficients > 0.97). Three observers (one surgeon, one experienced and one inexperienced observer) independently applied the developed method to measure the rod angulation of the included patients and performed the measurements twice. The reliability of the method was evaluated in terms of intraclass correlation coefficient (ICC), Bland-Altmann plot and 2S_R.</p><p><strong>Results: </strong>The intra-observer ICCs for all measurements exceed 0.85, indicating an excellent correlation. For the AIS/SK group, the surgeon showed a slightly lower reliability compared to the other two evaluators (0.93 vs 0.98 and 0.98). However, the surgeon showed a higher reliability in measurements of the rods at the lumbar level, both for L1-S1 and L4-S1 (0.98 vs 0.96 and 0.89; 0.97 vs. 0.85 and 0.91, respectively). The variability also showed excellent results, with a mean variability ranging from 1.09° to 3.76°. The inter-observer ICCs for the three measurement groups showed an excellent reliability for the AIS/SK group (0.98). The reliability was slightly lower but still excellent for the lumbar measurements in ASD patients at L1-S1 (0.89) and L4-S1 (0.83). The results of the 2S_R for each measured segment were 4.4° for T5-T11, 5.4° for L1-S1 and 5.5° for L4-S1.</p><p><strong>Conclusion: </strong>The described method represents a reliable and reproducible way to measure rod curvature. This method is based on routine X-rays and utilizes a regression algorithm that limits manual measurements and the related errors.</p>","PeriodicalId":21796,"journal":{"name":"Spine deformity","volume":" ","pages":"1773-1781"},"PeriodicalIF":1.6,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141176312","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}