JOR Spine最新文献

{"title":"An Extracellular Matrix Hydrogel Restores Disc Volume and Alleviates Axial Hypersensitivity in a Rat Model of Disc-Associated Pain","authors":"David J. Lillyman,&nbsp;Evie C. Reddick,&nbsp;Kayla E. Ney,&nbsp;Sydney M. Caparaso,&nbsp;Rebecca A. Wachs","doi":"10.1002/jsp2.70073","DOIUrl":"https://doi.org/10.1002/jsp2.70073","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Background</h3>\u0000 \u0000 <p>Chronic low back pain is a global socioeconomic crisis, and the majority of those treated for this condition fail to reach long-term remission. Intervertebral disc degeneration is the predominant associative factor in chronic low back pain. Degenerated discs present with mechanical instability, inflammation, and nerve sprouting. Patients treated with spinal stabilizing procedures often report pain alleviation indicating aberrant spinal mechanics, could be causative in the production of pain.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>With this knowledge, a therapeutic was engineered from decellularized healthy porcine nucleus pulposus tissue mixed with type I collagen and a chemical crosslinker, genipin, to treat mechanical instability and pain.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>In vitro, this hydrogel, termed dNP+, was spontaneously fibrillogenic at 37°C and cytocompatible with primary human disc cells and exhibited the capacity to improve the intervertebral disc storage modulus after injury. In vivo, in a rat model of discogenic low back pain, dNP+ proved effective at restoring degenerated disc volume, decreasing axial hypersensitivity, and decreasing spontaneous pain-like behavior when administered 9 weeks after disc degeneration was initiated. However, dNP+ did not alter nerve presence or restore disc morphology when compared to injured discs.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>Conclusion: Altogether, the data collected in this study concluded that dNP+ was an effective treatment for pain-like behavior in a robust animal model of chronic disc-associated low back pain.</p>\u0000 </section>\u0000 </div>","PeriodicalId":14876,"journal":{"name":"JOR Spine","volume":"8 2","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jsp2.70073","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Role of Sex Hormones in Cartilaginous Tissues: A Scoping Review","authors":"Jeffrey L. Hutchinson,&nbsp;Amalie J. Hutchinson,&nbsp;Joy Feng,&nbsp;Cheryle A. Séguin","doi":"10.1002/jsp2.70072","DOIUrl":"https://doi.org/10.1002/jsp2.70072","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Background</h3>\u0000 \u0000 <p>The use of sex hormones in the clinic for the management of musculoskeletal conditions is increasingly common. Despite this, the role of sex hormones in various joint tissues such as the intervertebral disc (IVD), temporomandibular joint (TMJ), and articular cartilage remains poorly understood. Here, we employ a database search strategy to critically examine the available literature in this field through a scoping review.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Using a 4-step protocol, primary research articles pertaining to sex hormones and the IVD, TMJ, or articular cartilage were identified and reviewed by two independent reviewers. ~3900 articles were identified in our initial search, and after review, ~140 were identified to be relevant to our tissues of interest and the effects of sex hormones.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Within all joint tissues investigated here, there were limited investigations on the effects of testosterone. Studies reported here for these tissues indicate that sex hormones are likely beneficial in the context of age-associated joint diseases, but there are important limitations to how this translates to the clinic given that various animal models can display distinct responses to sex hormone exposure. Direct comparisons of sex hormone therapies are limited between biological sexes, but evidence indicates that the molecular responses are likely similar. Current evidence indicates that sex hormone exposure likely has anti-inflammatory effects within joint tissues at the level of gene and protein expression, but the mechanism is unknown.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>Sex hormones such as testosterone and estrogen play an important role in inflammatory signaling within joint tissues, which could lead to novel interventions within the clinic for joint degeneration. However, understanding the biological mechanisms of hormones in these distinct tissues, between sexes, and with age is imperative for their proper implementation.</p>\u0000 </section>\u0000 </div>","PeriodicalId":14876,"journal":{"name":"JOR Spine","volume":"8 2","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jsp2.70072","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction to “Gut Microbiome and Metabolome Changes in Chronic Low Back Pain Patients With Vertebral Bone Marrow Lesions”","authors":"","doi":"10.1002/jsp2.70074","DOIUrl":"https://doi.org/10.1002/jsp2.70074","url":null,"abstract":"<p>W. Li, J. Tu, J. Zheng, et al., Gut Microbiome and Metabolome Changes in Chronic Low Back Pain Patients With Vertebral Bone Marrow Lesions. <i>JOR Spine</i> 8 (2025): e70042, https://doi.org/10.1002/jsp2.70042</p><p>In the article cited above, Affiliations 8 and 9 were mistakenly merged. This has now been corrected, and 16 author affiliations are now shown.</p><p>We apologize for this error.</p>","PeriodicalId":14876,"journal":{"name":"JOR Spine","volume":"8 2","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jsp2.70074","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Relationship Between Lumbar Multifidus Morphometry and Pain/Disability in Individuals With Chronic Nonspecific Low Back Pain After Considering Demographics, Fear-Avoidance Beliefs, Insomnia, and Spinal Degenerative Changes","authors":"Sabina M. Pinto,&nbsp;Jason P. Y. Cheung,&nbsp;Dino Samartzis,&nbsp;Jaro Karppinen,&nbsp;Yong-Ping Zheng,&nbsp;Marco Y. C. Pang,&nbsp;Maryse Fortin,&nbsp;Arnold Y. L. Wong","doi":"10.1002/jsp2.70071","DOIUrl":"https://doi.org/10.1002/jsp2.70071","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Background</h3>\u0000 \u0000 <p>Although individuals with chronic low back pain (CLBP) show increased fatty infiltration in the lumbar multifidus muscle (LMM), it remains unclear whether LMM changes are related to clinical outcomes (such as pain and disability) after considering confounders (spinal phenotypes, fear-avoidance beliefs [FABs] and insomnia). This study examined: (1) differences in confounders and LMM characteristics between individuals with and without CLBP; and (2) associations between confounders, LMM parameters, and clinical outcomes in the CLBP group alone.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Participants (CLBP = 70 and asymptomatic people = 67) underwent lumbar magnetic resonance imaging. Outcome measures comprised the numeric pain rating scale, the Roland–Morris Disability Questionnaire, the Fear-Avoidance Beliefs Questionnaire (FABQ), and the Insomnia Severity Index (ISI) Scale. LMM morphometry at L3-S1 (cross-sectional area, total volume, and fatty infiltration) was measured using a customized MATLAB program. Spinal phenotypes (disc degeneration, high-intensity zones, Modic changes [MCs], Schmorl's nodes, facet joint degeneration [FJD], and facet tropism [FT]) were scored. The between-group differences were analyzed using linear mixed models and chi-squared/Fisher's exact tests. Univariate and multivariate analyses evaluated associations between clinical outcomes and other outcome measures in the CLBP group.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>The CLBP group demonstrated more severe disc degeneration and FJD at all levels, and greater FT at L5/S1 than asymptomatic participants (<i>p</i> &lt; 0.05). The average LMM total volume at L3/4 and the percentage of fatty infiltration in LMM in the L3-S1 region were greater in the CLBP group than in asymptomatic counterparts (<i>p</i> &lt; 0.05). The presence of MC at L4 and FJD at L4/5 and L4-S1 was significantly related to pain intensity in the CLBP group. Similarly, FABQ-Work and ISI scores were significantly related to pain intensity (explaining 37% of the variance in pain).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>The CLBP group displays more fatty infiltration in the LMM, but their LMM morphometric parameters are unrelated to pain/disability after considering spinal phenotypes, FABs, and insomnia.</p>\u0000 </section>\u0000 </div>","PeriodicalId":14876,"journal":{"name":"JOR Spine","volume":"8 2","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jsp2.70071","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Intervertebral Lumbar Spine Kinematics in Chronic Low Back Pain Patients Measured Using Biplane Radiography","authors":"William Anderst,&nbsp;C. James Kim,&nbsp;Kevin M. Bell,&nbsp;Tom Gale,&nbsp;Cate Gray,&nbsp;Carol M. Greco,&nbsp;Clarissa LeVasseur,&nbsp;Gina McKernan,&nbsp;Sabreen Megherhi,&nbsp;Charity G. Patterson,&nbsp;Sara R. Piva,&nbsp;Caroline Pellegrini,&nbsp;Michael J. Schneider,&nbsp;Joseph Shoemaker,&nbsp;Patrick Smith,&nbsp;Nam V. Vo,&nbsp;Gwendolyn A. Sowa","doi":"10.1002/jsp2.70069","DOIUrl":"https://doi.org/10.1002/jsp2.70069","url":null,"abstract":"&lt;div&gt;\u0000 \u0000 \u0000 &lt;section&gt;\u0000 \u0000 &lt;h3&gt; Background&lt;/h3&gt;\u0000 \u0000 &lt;p&gt;Chronic low back pain (cLBP) presents as a heterogeneous condition, making diagnosis and treatment challenging. Lumbar spine intervertebral kinematics may provide an objective assessment of patients with cLBP that may be used to inform treatment decisions and evaluate the efficacy of interventions. The purpose of this study was to provide a quantitative description of intervertebral motion in the lumbar spine during flexion/extension (F/E) and lateral bending (LB) in individuals with cLBP.&lt;/p&gt;\u0000 &lt;/section&gt;\u0000 \u0000 &lt;section&gt;\u0000 \u0000 &lt;h3&gt; Methods&lt;/h3&gt;\u0000 \u0000 &lt;p&gt;Data from 125 individuals is included in this analysis (M: 53; F: 72; &lt;i&gt;n&lt;/i&gt; = 66 &lt; 60 years of age; average BMI: 25.7 ± 3.6 kg/m&lt;sup&gt;2&lt;/sup&gt;). Dynamic biplane radiography (DBR) and a validated volumetric model-based tracking system were used to assess intervertebral motion at every lumbar level (L1-L2 through L5-S1) during active F/E and LB movements in individuals with cLBP. The outcome measures were the intervertebral translation and rotation range of motion (ROM), the contribution of each motion segment to lumbar motion, the anterior–posterior slip per degree of flexion (SPDF), and trial-to-trial repeatability as assessed by the standard deviation in continuous kinematics waveforms over 3 trials of each movement. Outcomes were calculated for the entire group as well as for the subgroups of men, women, individuals less than 60 years of age, and individuals 60 or more years of age.&lt;/p&gt;\u0000 &lt;/section&gt;\u0000 \u0000 &lt;section&gt;\u0000 \u0000 &lt;h3&gt; Results&lt;/h3&gt;\u0000 \u0000 &lt;p&gt;The mean intervertebral F/E ROM progressively increased from 6.8° ± 3.1° at the L1-L2 through the L4-L5 motion segments, then decreased from 9.7° ± 5.2° at L4-L5 to 8.4° ± 4.9° at L5-S1. However, substantial variability among individuals was observed, and only 7 participants (5.6%) followed this ROM pattern. The mean intervertebral LB ROM increased from 8.8° ± 3.2° at L1-L2 to 9.1° ± 4.2° at L2-L3 and then progressively decreased from the L2-L3 through the L5-S1 motion segments to 2.7° ± 1.8°. However, only 13 participants (10.4%) followed this ROM pattern. On average, the L1-L2, L2-L3, and L5-S1 motion segments were the main contributors to F/E when the torso was near the upright neutral position. L2-L3, L3-L4, and L4-L5 were the main contributors to midrange flexion and extension, and L3-L4, L4-L5, and L5-S1 were the main contributors to lumbar motion when the trunk was near full flexion. L1-L2 and L2-L3 were the main contributors to lumbar LB near the neutral position and through the midrange. The contributions from L4-L5 and L5-S1 peaked at the neutral position and at maximum bending. SPDF was similar in the L1-L2, L2-L3, and L3-L4 motion segmen","PeriodicalId":14876,"journal":{"name":"JOR Spine","volume":"8 2","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jsp2.70069","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanisms and Therapeutic Strategies of Macrophage Polarization in Intervertebral Disc Degeneration","authors":"Kaiyuan Zheng,&nbsp;Siyu Wang,&nbsp;Meng Deng,&nbsp;Yaomin Luo,&nbsp;Wen Li,&nbsp;Lianlin Zeng,&nbsp;Yinxu Wang","doi":"10.1002/jsp2.70065","DOIUrl":"https://doi.org/10.1002/jsp2.70065","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Background</h3>\u0000 \u0000 <p>Intervertebral disc degeneration (IVDD) is a leading cause of low back pain (LBP), contributing significantly to global disability and productivity loss. Its pathogenesis involves complex processes, including inflammation, cellular senescence, angiogenesis, fibrosis, neural ingrowth, and sensitization. Emerging evidence highlights macrophages as central immune regulators infiltrating degenerated discs, with macrophage polarization implicated in IVDD progression. However, the mechanisms linking macrophage polarization to IVDD pathology remain poorly elucidated.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>A comprehensive literature review was conducted by searching major databases (PubMed, Web of Science, and Scopus) for studies published in the last decade (2014–2024). Keywords included “intervertebral disc degeneration,” “macrophage polarization,” “inflammation,” “senescence,” and “therapeutic strategies.” Relevant articles were selected, analyzed, and synthesized to evaluate the role of macrophage polarization in IVDD.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Macrophage polarization dynamically influences IVDD through multiple pathways. Pro-inflammatory M1 macrophages exacerbate disc degeneration by amplifying inflammatory cytokines (e.g., TNF-α, IL-1β), promoting cellular senescence, and stimulating abnormal angiogenesis and neural ingrowth. In contrast, anti-inflammatory M2 macrophages may mitigate degeneration by suppressing inflammation and enhancing tissue repair. Therapeutic strategies targeting macrophage polarization include pharmacological agents (e.g., cytokines, small-molecule inhibitors), biologic therapies, gene editing, and physical interventions. Challenges persist, such as incomplete understanding of polarization triggers, lack of targeted delivery systems, and limited translational success in preclinical models.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>Macrophage polarization is a pivotal regulator of IVDD pathology, offering promising therapeutic targets. Future research should focus on elucidating polarization mechanisms, optimizing spatiotemporal control of macrophage phenotypes, and developing personalized therapies. Addressing these challenges may advance innovative strategies to halt or reverse IVDD progression, ultimately improving clinical outcomes for LBP patients.</p>\u0000 </section>\u0000 </div>","PeriodicalId":14876,"journal":{"name":"JOR Spine","volume":"8 2","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jsp2.70065","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Human Disc Degeneration Is Accompanied by a Loss of Anterior Annulus Fibrosus Interlamellar Matrix Integrity as Assessed by Peel Tests","authors":"Manmeet S. Dhiman,&nbsp;Mohammed A. Salaam,&nbsp;Taylor J. Bader,&nbsp;Fred Nicholls,&nbsp;W. Bradley Jacobs,&nbsp;Kenneth C. Thomas,&nbsp;Jacques Bouchard,&nbsp;Paul T. Salo,&nbsp;David A. Hart,&nbsp;Ganesh Swamy,&nbsp;Neil A. Duncan","doi":"10.1002/jsp2.70067","DOIUrl":"https://doi.org/10.1002/jsp2.70067","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Introduction</h3>\u0000 \u0000 <p>Disc degeneration (DD) is accompanied by biomechanical changes in the intervertebral discs. The lamellae of the annulus fibrosus (AF) are interconnected through the interlamellar matrix (ILM). The ILM contains interlamellar cross-bridges, connecting the lamellae radially in three dimensions. Weakening of the ILM and the cross-bridges could contribute to delamination between the lamellae, reducing their ability to resist loads and thus contributing to loss of AF integrity associated with the development and progression of degeneration. The objective of the present study was to quantify the differences in interlamellar mechanical properties of fresh AF samples from surgical DD individuals compared to AF samples from non-DD donors.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>An interlamellar peel test was performed on fresh AF tissue collected from DD surgeries (<i>n</i> = 36) and non-DD organ donors (<i>n</i> = 13). The tissue was peeled at 0.5 mm/s until complete separation. Interlamellar mechanical properties were calculated from the force-displacement curve.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Samples from DD individuals had lower Peel Stiffness (<i>p</i> = 0.001), Peel Strength (<i>p</i> = 0.001), Peel Toughness (<i>p</i> = 0.0009), and Standard Deviation of the Peel Stress (<i>p</i> = 0.02) compared to the tissue from non-DD organ donors. Age had moderate negative correlations with Peel Stiffness (<i>R</i> = −0.59), Peel Strength (<i>R</i> = −0.66), and Peel Toughness (<i>R</i> = −0.69) for non-DD samples only.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Discussion</h3>\u0000 \u0000 <p>The mechanical integrity of the ILM was determined to be lower in surgical DD individuals compared to non-DD donors. Aging alone may not have affected the results, and rather, loss of the integrity of ILM during disease progression appeared to have significantly contributed to the differences observed. This study provides new mechanical insights into the delamination often observed in the AF of surgical DD individuals. Future biochemical and immunolocalization studies, integrated with mechanical data, will aim to understand the role of collagen and elastin structure and composition in the decreased mechanical integrity of affected tissues.</p>\u0000 </section>\u0000 </div>","PeriodicalId":14876,"journal":{"name":"JOR Spine","volume":"8 2","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jsp2.70067","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diurnal Asymmetric Loading Modulates Cell Phenotype in Intervertebral Disc","authors":"Ying Zhang,&nbsp;Jianbiao Xu,&nbsp;Zhiyu Zhou,&nbsp;R. Geoff Richards,&nbsp;Mauro Alini,&nbsp;Sibylle Grad,&nbsp;Zhen Li","doi":"10.1002/jsp2.70068","DOIUrl":"https://doi.org/10.1002/jsp2.70068","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Purpose</h3>\u0000 \u0000 <p>This study tested the hypothesis that asymmetric dynamic loading alone or in combination with static loading influences the morphological and biological characteristics of the intervertebral disc (IVD) cells in an ex vivo model.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Bovine caudal IVDs were assigned to four groups: (1) Parallel dynamic load (1 h) + free swelling (23 h); (2) Parallel dynamic load (1 h) + static load (23 h); (3) Wedge dynamic load (1 h) + free swelling (23 h); (4) Wedge dynamic load (1 h) + static load (23 h). IVD structure was assessed with measurements of height loss and histological staining. IVD tissue and cellular responses were also measured.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Diurnal dynamic loading and free swelling recovery could maintain cell viability and the gene expression of organ-cultured discs at their physiological level. Diurnal dynamic loading followed by static loading resulted in a degenerative condition, as indicated by lower cell viability, lower anabolic, and higher catabolic gene expression. Under the dynamic load + free swelling load regime, wedge loading upregulated the ACAN gene expression level in the concave and convex sides of the annulus fibrosus (AF) compared with day 0 healthy control. Under the dynamic load + static loading regime, the MMP1 gene expression showed a trend of increase in the concave and convex sides of the wedge group; the MMP13 gene expression showed a trend of increase in the concave side of the wedge group. The nucleus pulposus (NP) tissue in the wedge group showed a trend of protrusion toward the convex side.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>Dynamic loading followed by continuous static loading negatively modulates the phenotype of IVD cells in this organ culture model. Comparable to the free swelling treatment after dynamic loading, physical treatment to reduce the stress on the IVD, even temporarily, may help to prevent the acceleration of deformity and degeneration. These results indicate that asymmetric loading followed by static loading may be used to mimic pathological changes of the IVD in spinal deformity.</p>\u0000 </section>\u0000 </div>","PeriodicalId":14876,"journal":{"name":"JOR Spine","volume":"8 2","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jsp2.70068","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143914384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Identification and Validation of Circadian Rhythm-Related Genes Involved in Intervertebral Disc Degeneration and Analysis of Immune Cell Infiltration via Machine Learning","authors":"Yongbo Zhang,&nbsp;Liuyang Chen,&nbsp;Sheng Yang,&nbsp;Rui Dai,&nbsp;Hua Sun,&nbsp;Liang Zhang","doi":"10.1002/jsp2.70066","DOIUrl":"https://doi.org/10.1002/jsp2.70066","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Background</h3>\u0000 \u0000 <p>Low back pain is a significant burden worldwide, and intervertebral disc degeneration (IVDD) is identified as the primary cause. Recent research has emphasized the significant role of circadian rhythms (CRs) and immunity in affecting intervertebral discs (IVD). However, the influence of circadian rhythms and immunity on the mechanism of IVDD remains unclear. This study aimed to identify and validate key rhythm-related genes in IVDD and analyze their correlation with immune cell infiltration.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Two gene expression profiles related to IVDD and rhythm-related genes were obtained from the Gene Expression Omnibus and GeneCards databases to identify differentially expressed rhythm-related genes (DERGs). Gene Ontology (GO), Kyoto Encyclopedia of Genes and Genomes (KEGG) and gene set enrichment analysis (GSEA) were conducted to explore the biological functions of these genes. LASSO regression and SVM algorithms were employed to identify hub genes. We subsequently investigated the correlation between hub rhythm-related genes and immune cell infiltration. Finally, nucleus pulposus-derived mesenchymal stem cells (NPMSCs) were isolated from normal and degenerative human IVD tissues. Hub rhythm-related genes expression in NPMSCs was confirmed by real-time quantitative PCR (RT-qPCR).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Six hub genes related to CRs (CCND1, FOXO1, FRMD8, NTRK2, PRRT1, and TFPI) were screened out. Immune infiltration analysis revealed that the IVDD group had significantly more M0 macrophages and significantly fewer follicular helper T cells than those of the control group. Specifically, M0 macrophages were significantly associated with FRMD8, PRRT1, and TFPI. T follicular helper cells were significantly associated with FRDM8, FOXO1, and CCND1. We further confirmed that CCND1, FRMD8, NTRK2, and TFPI were dysrhythmic within NPMSCs from degenerated IVD in vitro.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>Six genes (CCND1, FOXO1, FRMD8, NTRK2, PRRT1 and TFPI) linked to circadian rhythms associated with IVDD progression, together with immunity. The identification of these DEGs may provide new insights for the diagnosis and treatment of IVDD.</p>\u0000 </section>\u0000 </div>","PeriodicalId":14876,"journal":{"name":"JOR Spine","volume":"8 2","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jsp2.70066","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143827060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physiological and Anthropometric Factors Associated With Spine Loading Estimates From Imaging-Based Subject-Specific Musculoskeletal Models","authors":"Brett T. Allaire,&nbsp;Fjola Johannesdottir,&nbsp;Mary L. Bouxsein,&nbsp;Dennis E. Anderson","doi":"10.1002/jsp2.70059","DOIUrl":"https://doi.org/10.1002/jsp2.70059","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Background</h3>\u0000 \u0000 <p>Subject-specific musculoskeletal models may be used to estimate spine loads that cannot be measured in vivo. Model generation methods may use detailed measurements extracted from medical imaging, but it may be possible to create accurate models without these measurements. We aimed to determine which physiological and anthropometric factors are associated with spine loading and should be accounted for in model creation.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>We created models of 440 subjects from the Framingham Heart Study Multi-detector CT Study, extracting muscle morphology and spine profile information from CT scans of the trunk. Five lifting activities were simulated, and compressive and shear loading estimates were produced. We performed principal component analysis on the loading data from three locations in the spine, as well as univariate correlations between predictor variables and each principal component (PC). We identified multivariate predictive regression models for each PC and individual loading estimate.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>A single PC explained 90% of the variability in compressive loading, while four PCs were identified that explained 10%–37% individually, 86% in total, of the variability in shear loading. Univariate analysis showed that body weight, BMI, lean mass, and waist circumference were most associated with the compression PC and first shear PC. Multivariate regression modeling showed predictor variables predicted 94% of the variability in the compression PC, but only 54% in the first shear PC, with body weight having the highest contribution. Additional shear PCs were less predictable. Level- and activity-specific compressive loading was predicted using a limited set of physiological and anthropometric factors.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>This work identifies easily measured characteristics, particularly weight and height, along with sex, associated with subject-specific loading estimates. It suggests that compressive loading, or models to evaluate compressive loading, may be based on a limited set of anthropometric attributes. Shear loading appears more complex and may require additional information not captured in the set of factors we examined.</p>\u0000 </section>\u0000 </div>","PeriodicalId":14876,"journal":{"name":"JOR Spine","volume":"8 2","pages":""},"PeriodicalIF":3.4,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/jsp2.70059","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143822058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}