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Determinants of diurnal variation in lumbar intervertebral discs and paraspinal muscles: A prospective quantitative magnetic resonance imaging study. Eur J Radiol 2023; 160:110712. [PMID: 36720179 DOI: 10.1016/j.ejrad.2023.110712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 01/15/2023] [Accepted: 01/19/2023] [Indexed: 01/25/2023]
Abstract
PURPOSE To prospectively investigate the determinants of diurnal variations in lumbar intervertebral discs and paraspinal muscles. METHOD 71 females aged 19 ∼ 31 years were examined by morning-evening T2 mapping/diffusion kurtosis imaging (DKI), with weight and lifestyle information (time in night bed-rest [TIB], bed-napping, activity time, and sitting time) assessed by standardized questionnaires. Diurnal shifts in T2, mean diffusivity and mean kurtosis (T2-DS, MD-DS and MK-DS; morning-value minus evening-value) were evaluated for L4-S1 discs (normal, Pfirrmann grade Ⅰ/Ⅱ; degenerative, III/IV). T2 and T2-DS were assessed for L4/5 multifidus and erector spinalis. RESULTS For normal discs, bed-napping correlated with MD-DS and MK-DS in disc entirety (p = 0.001 and 0.004); increased activity time suggested higher T2-DS in nucleus pulposus (p = 0.004); prolonged sitting time predicted greater T2-DS in disc entirety and posterior inner annulus fibrosus (PI-AF, p ≤ 0.011); decreased TIB and weight suggested lower T2-DS and higher MK-DS in PI-AF (p = 0.001 ∼ 0.035). For degenerative discs, bed-napping predicted lower T2-DS in nucleus pulposus and PI-AF (p = 0.019); increased TIBsuggested higher T2-DS and lower MK-DS in PI-AF (p = 0.006 and 0.034); longer sitting time predicted higher MK-DS in PI-AF (p = 0.020). Paraspinal muscles exhibited diurnal T2 variation (p < 0.001) which did not correlate with lifestyle factors (p > 0.050). CONCLUSIONS Lifestyle and weight have causal effects on the diurnal variation of lumbar discs. Bed-rest may correlate with disc hydration and microstructural stability reserves for subsequent daytime activities. Sitting behavior could induce greater dehydration in normal discs and may alleviate diurnal microstructural rearrangement in degenerative discs. T2 mapping and DKI are promising tools to evaluate disc biomechanics in clinics.
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Liu C, Wang J, Hou B, Li Y, Morelli JN, Zhang P, Ran J, Li X. Diurnal Variation in Hydration of the Cervical Intervertebral Disc Assessed Using T2 Mapping of Magnetic Resonance Imaging. Korean J Radiol 2022; 23:638-648. [PMID: 35617994 PMCID: PMC9174496 DOI: 10.3348/kjr.2021.0950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 03/10/2022] [Accepted: 04/01/2022] [Indexed: 11/15/2022] Open
Abstract
Objective The study aimed to investigate the diurnal variation in cervical disc hydration and its relationship with cervical degeneration. Materials and Methods C3–C7 discs of 86 prospectively enrolled participants (37 males, 49 females; mean age ± standard deviation, 23.5 ± 2.5 years) were assessed using T2 mapping in the morning and evening. All discs were stratified by Miyazaki grade or C2–C7 Cobb angle and T2 values (T2). The degree of diurnal T2 variation (T2-DDV), defined as (morning T2 – evening T2)/morning T2 × 100%, was measured for the entire disc, annulus fibrosus (AF), nucleus pulposus (NP), and endplate zones. Results T2 of the entire disc decreased significantly after the daytime load (p < 0.001), with a T2-DDV of 13.3% for all discs and 16.0%, 12.2%, and 13.0% for healthy (grade I), mild degenerative (grade II), and advanced degenerative (grade III/IV) discs, respectively. T2 of regional NPs and AFs decreased significantly from morning to evening (p ≤ 0.049) except in the healthy anterior inner AF (p = 0.092). Compared with healthy discs, mild degenerative discs displayed lower T2 and T2-DDV in regional NPs (p < 0.001). Advanced degenerative discs showed higher T2-DDV in the anterior inner AF compared with healthy discs (p = 0.050). Significant diurnal T2 changes in the endplate zones were observed only in healthy discs (p = 0.013). Cervical discs in the low Cobb angle group showed higher T2-DDV in the anterior AFs and anterior NP and lower T2-DDV in the posterior AF than those in the high Cobb angle group (p ≤ 0.041). Conclusion This study characterized the diurnal variation in hydration of the cervical discs as assessed using T2 mapping and revealed early chemo-mechanical coupling dysfunction in degenerating discs. Cervical sagittal alignment on MRI can affect the diurnal stress patterns of the cervical discs. T2 mapping is sensitive to disc biomechanical dysfunction and offers translational potential from biomechanical research to clinical application.
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Affiliation(s)
- Chanyuan Liu
- Department of Radiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jingyi Wang
- Department of Radiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Bowen Hou
- Department of Radiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yitong Li
- Department of Radiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - John N Morelli
- The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Peisen Zhang
- Department of Rehabilitation Medicine, School of Medicine, Guangzhou First People's Hospital, South China University of Technology, Guangzhou, China
| | - Jun Ran
- Department of Radiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xiaoming Li
- Department of Radiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
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An energy approach describes spine equilibrium in adolescent idiopathic scoliosis. Biomech Model Mechanobiol 2020; 20:359-370. [PMID: 33006695 DOI: 10.1007/s10237-020-01390-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 09/19/2020] [Indexed: 10/23/2022]
Abstract
The adolescent idiopathic scoliosis (AIS) is a 3D deformity of the spine whose origin is unknown and clinical evolution unpredictable. In this work, a mixed theoretical and numerical approach based on energetic considerations is proposed to study the global spine deformations. The introduced mechanical model aims at overcoming the limitations of computational cost and high variability in physical parameters. The model is constituted of rigid vertebral bodies associated with 3D effective stiffness tensors. The spine equilibrium is found using minimization methods of the mechanical total energy which circumvents forces and loading calculation. The values of the model parameters exhibited in the stiffness tensor are retrieved using a combination of clinical images post-processing and inverse algorithms implementation. Energy distribution patterns can then be evaluated at the global spine scale to investigate given time patient-specific features. To verify the reliability of the numerical methods, a simplified model of spine was implemented. The methodology was then applied to a clinical case of AIS (13-year-old girl, Lenke 1A). Comparisons of the numerical spine geometry with clinical data equilibria showed numerical calculations were performed with great accuracy. The patient follow-up allowed us to highlight the energetic role of the apical and junctional zones of the deformed spine, the repercussion of sagittal bending in sacro-illiac junctions and the significant role of torsion with scoliosis aggravation. Tangible comparisons of output measures with clinical pathology knowledge provided a reliable basis for further use of those numerical developments in AIS classification, scoliosis evolution prediction and potentially surgical planning.
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Meadows KD, Johnson CL, Peloquin JM, Spencer RG, Vresilovic EJ, Elliott DM. Impact of pulse sequence, analysis method, and signal to noise ratio on the accuracy of intervertebral disc T 2 measurement. JOR Spine 2020; 3:e1102. [PMID: 33015575 PMCID: PMC7524248 DOI: 10.1002/jsp2.1102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 05/28/2020] [Accepted: 06/01/2020] [Indexed: 12/17/2022] Open
Abstract
Noninvasive assessments of intervertebral disc health and degeneration are critical for addressing disc degeneration and low back pain. Magnetic resonance imaging (MRI) is exceptionally sensitive to tissue with high water content, and measurement of the MR transverse relaxation time, T 2, has been applied as a quantitative, continuous, and objective measure of disc degeneration that is linked to the water and matrix composition of the disc. However, T 2 measurement is susceptible to inaccuracies due to Rician noise, T 1 contamination, and stimulated echo effects. These error generators can all be controlled for with proper data collection and fitting methods. The objective of this study was to identify sequence parameters to appropriately acquire MR data and to establish curve fitting methods to accurately calculate disc T 2 in the presence of noise by correcting for Rician noise. To do so, we compared T 2 calculated from the typical monoexponential (MONO) fits and noise corrected exponential (NCEXP) fits. We examined how the selected sequence parameters altered the calculated T 2 in silico and in vivo. Typical MONO fits were frequently poor due to Rician noise, and NCEXP fits were more likely to provide accurate T 2 calculations. NCEXP is particularly less biased and less uncertain at low SNR. This study showed that the NCEXP using sequences with data from 20 echoes out to echo times of ~300 ms is the best method for calculating T 2 of discs. By acquiring signal data out to longer echo times and accounting for Rician noise, the curve fitting is more robust in calculating T 2 despite the noise in the data. This is particularly important when considering degenerate discs or AF tissue because the SNR of these regions is lower.
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Affiliation(s)
- Kyle D Meadows
- Biomedical Engineering University of Delaware Newark Delaware USA
| | - Curtis L Johnson
- Biomedical Engineering University of Delaware Newark Delaware USA
| | - John M Peloquin
- Biomedical Engineering University of Delaware Newark Delaware USA
| | - Richard G Spencer
- National Institute on Aging, National Institutes of Health Baltimore Maryland USA
| | | | - Dawn M Elliott
- Biomedical Engineering University of Delaware Newark Delaware USA
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Meng C, Li Y, Wang S, Yu J, Kou D, Liu C. Application of a modified optical fiber in targeted percutaneous laser disc decompression of lumbar disc herniation: A retrospective study. Exp Ther Med 2019; 18:3552-3562. [PMID: 31602232 PMCID: PMC6777334 DOI: 10.3892/etm.2019.7983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 08/01/2019] [Indexed: 11/06/2022] Open
Abstract
Targeted percutaneous laser disc decompression (T-PLDD) is a minimally invasive technique for the treatment of lumbar disc herniation (LDH). However, the amount of energy required is large and the nerve can be easily damaged. Therefore, this technology requires improvement. The present study aimed to observe the effects of using a modified optical fiber (Mod) in T-PLDD for the treatment of LDH. A retrospective study was conducted using the database of the Affiliated Hospital of Qingdao University (Qingdao, China). In total, 58 patients who received T-PLDD with the Mod between June 2011 and May 2012 were included in the present study. The 10-point numeric rating score, pain rating index and good-to-excellent rating at 3 months (1.64±0.97; 5.79±1.57; 94.8%) were lower than those at 1 week (5.12±1.37; 11.52±1.85; 74.2%), and at 1 month (3.26±1.41; 7.83±1.31; 82.8%; P<0.05) and were maintained for up to 36 months (1.48±0.86; 4.91±1.43; 96.5%). The Oswestry disability index and 12-item Short Form Health Survey at 6 months (24.56±6.78; 69.40±5.08) were improved compared with 1 week, 1 month and 3 months, and were maintained for 36 months (23.10±6.20; 70.89±5.39). The T2 value decreased at 1 week (76±8) and returned to normal at 3 months (152±11). Additionally, patients in the Young group (<50 years old) recovered in a shorter period of time than the patients in the Elderly group. In conclusion, the patients stayed in hospital for 3.34±0.66 days; pain decreased and function increased optimally at 3–6 months and was maintained for 36 months with no serious complications. Individuals <50 years old may be more suitable candidates for T-PLDD with the Mod. The Mod should be applied and promoted in T-PLDD, and its use should be considered in the clinical setting.
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Affiliation(s)
- Chao Meng
- Department of Pain Management, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, P.R. China
| | - Yujun Li
- Department of Pathology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, P.R. China
| | - Shijie Wang
- Department of Pain Management, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, P.R. China
| | - Junmin Yu
- Department of Pain Management, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, P.R. China
| | - Dewei Kou
- Department of Pain Management, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, P.R. China
| | - Chuansheng Liu
- Department of Pain Management, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266000, P.R. China
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The importance of level stratification for quantitative MR studies of lumbar intervertebral discs: a cross-sectional analysis in 101 healthy adults. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2019; 28:2153-2161. [PMID: 31309335 DOI: 10.1007/s00586-019-06059-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 05/31/2019] [Accepted: 07/01/2019] [Indexed: 10/26/2022]
Abstract
PURPOSE To investigate whether quantitative T2-times depend on lumbar intervertebral disc (IVD) level. METHODS The lumbar spine (Th12/L1-L5/S1) of 101 participants (53.5% female, 30.0[± 3.6]years, 173.5[± 9.6]cm and 69.9[± 13.4]kg), without history of back pain, was examined on a 3T scanner with sagittal T2-mapping. All IVDs were stratified according to Pfirrmann grade and lumbar level, with mean T2-time determined for the entire IVD volume and in five subregions of interests. RESULTS Significant level-dependent T2-time differences were detected, both for the entire IVD volume and its subregions. For the entire IVD volume, Pfirrmann grade 2 IVDs displayed 9-18% higher T2-times in Th12/L1 IVDs compared to L2/L3-L5/S1 IVDs (0.001 > p < 0.004) and significantly different T2-times in L1/L2-L2/L3 IVDs compared to most of the IVDs in the lower lumbar spine. In Pfirrmann grades 1, 3 and 4 IVDs, no significant level-dependent T2-time differences were observed for the entire IVD. More pronounced results were observed when comparing IVD subregions, with significant level-dependent differences also within Pfirrmann grade 1 and grade 3 IVDs. For example, in posterior IVD subregions mean T2-time was 80-82% higher in Th12/L1 compared to L3/L4-L4/L5 Pfirrmann grade 1 IVDs (p < 0.05) and 10-14% higher in L5/S1 compared to L3/L4-L4/L5 Pfirrmann grade 3 IVDs (0.02 > p < 0.001). DISCUSSION Significant level-dependent T2-time differences within several Pfirrmann grades, both for the entire IVD volume and for multiple IVD subregions, were shown in this large cohort study. The T2-time differences between levels existed in both non-degenerated and degenerated IVDs. These findings show the importance of stratifying for lumbar level when quantitative IVD studies are performed using T2-mapping. These slides can be retrieved under Electronic Supplementary Material.
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Rubinic DM, Koo V, Dudley J, Owens SC. Changes in Spinal Height After Manual Axial Traction or Side Lying: A Clinical Measure of Intervertebral Disc Hydration Using Stadiometry. J Manipulative Physiol Ther 2019; 42:187-194. [PMID: 31078315 DOI: 10.1016/j.jmpt.2019.03.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 06/12/2018] [Accepted: 03/07/2019] [Indexed: 01/21/2023]
Abstract
OBJECTIVES The purpose of this study was to determine the immediate effects of a manual therapy technique consisting of axial traction compared with side lying on increased spine height after sustained loading. METHODS Twenty-one asymptomatic participants were included. Participants either received manual therapy technique consisting of manual axial traction force for 2 consecutive rounds of 3 minutes or sustained side lying for 10 minutes. Spine height was measured using a commercially available stadiometer. Spinal height change was determined from measurements taken after loaded walking and measurements taken after manual therapy. A paired t test was performed to determine if a manual therapy technique consisting of axial traction increased spinal height after a period of spinal loading. RESULTS A significant increase in height was found after both manual therapy technique and sustained side lying (P < .0001). The mean height gain was 8.60 mm using 3-dimensional axial separation. CONCLUSION This study is an initial attempt at evaluating the biomechanical effects of manual therapy technique consisting of axial traction. Both manual axial traction force and sustained side-lying position were equally effective for short-term change in spine height after a loaded walking protocol among healthy asymptomatic individuals. This study protocol may help to inform future studies that evaluate spine height after loading.
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Affiliation(s)
- Dylan M Rubinic
- Department of Physical Therapy, Hampton University, Hampton, VA.
| | - Victor Koo
- Department of Physical Therapy, Hampton University, Hampton, VA
| | - Julian Dudley
- Department of Physical Therapy, Hampton University, Hampton, VA
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Torén L, Hebelka H, Kasperska I, Brisby H, Lagerstrand K. With axial loading during MRI diurnal T2-value changes in lumbar discs are neglectable: a cross sectional study. BMC Musculoskelet Disord 2018; 19:25. [PMID: 29357844 PMCID: PMC5778755 DOI: 10.1186/s12891-018-1930-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 01/02/2018] [Indexed: 12/22/2022] Open
Abstract
Background Axial loading during MRI (alMRI) combined with T2 mapping recently was shown as a promising method to reveal biomechanical intervertebral disc (IVD) characteristics. This feasibility study aims to investigate whether there is a diurnal variation in the IVD T2-value when using alMRI. This is of importance for the planning of when to perform alMRI investigations and for interpretations of alMRI findings in relation to clinical symptoms. Methods Six healthy volunteers (30 lumbar discs), were examined with alMRI at three different sessions during 1 day. To be representative for a low back pain cohort in terms of age and IVD degeneration the included participants had a wide age range (27-63y) and all Pfirrmann grades represented. The T2-values were measured in five IVD regions of interest (ROI). The ROIs were equally large in sagittal plane with ROI1 representing anterior parts of the IVD, ROI5 posterior IVD parts and ROI2–4 the parts in between. Results T2-values of the entire IVD varied between 38 and 138 ms at 7 am, 33-143 ms at 11.30 am, and 31-147 ms at 4 pm with large regional IVD variations at all time points. No significant alterations of the T2-values over the day were found, neither for the entire IVD (p = 0.4) nor for the various ROIs (p = 0.2–1.0). Neither when correlated to Pfirrmann grade, any significant diurnal T2-value changes were found. Conclusions With alMRI, only minor diurnal T2-value changes were found in the lumbar discs. Nonsignificant and neglectable diurnal changes are advantageous both for research purposes, as well as in the clinical setting, giving comparable and robust data regardless of at what time-point the alMRI is performed.
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Affiliation(s)
- L Torén
- Department of Radiology, Sahlgrenska University Hospital, Gothenburg, Sweden.,Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - H Hebelka
- Department of Radiology, Sahlgrenska University Hospital, Gothenburg, Sweden. .,Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
| | - I Kasperska
- Department of Radiology, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - H Brisby
- Department of Orthopaedics, Sahlgrenska University Hospital, Gothenburg, Sweden.,Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - K Lagerstrand
- Department of Medical Physics and Techniques, Sahlgrenska University Hospital, Gothenburg, Sweden.,Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
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Galley J, Maestretti G, Koch G, Hoogewoud HM. Real T1 relaxation time measurement and diurnal variation analysis of intervertebral discs in a healthy population of 50 volunteers. Eur J Radiol 2016; 87:13-19. [PMID: 28065371 DOI: 10.1016/j.ejrad.2016.12.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 11/21/2016] [Accepted: 12/01/2016] [Indexed: 11/28/2022]
Abstract
PURPOSE To measure the real T1 relaxation time of the lumbar intervertebral discs in a young and healthy population, using different inversion recovery times, and assess diurnal variation. MATERIAL AND METHODS Intervertebral discs from D12 to S1 of 50 healthy volunteers from 18 to 25 years old were evaluated twice the same day, in the morning and in the late afternoon. Dedicated MRI sequences with different inversion recovery times (from 100 to 2500ms) were used to calculate the real T1 relaxation time. Three regions of interest (ROIs) were defined in each disc, the middle representing the nucleus pulposus (NP) and the outer parts the annulus fibrosus (AF) anterior and posterior. Diurnal variation and differences between each disc level were analyzed. RESULTS T1 mean values in the NP were 1142±12ms in the morning and 1085±13ms in the afternoon, showing a highly significant decrease of 57ms (p<0.001). A highly significant difference between the levels of the spine was found. The mean T1 of the anterior part of the AF was 577±9ms in the morning and 554±8ms in the afternoon. For the posterior part, the mean values were 633±8ms in the morning and 581±7ms in the evening. It shows a highly significant decrease of 23ms for the anterior part and 51ms for the posterior part (all p<0.001). CONCLUSION T1 mapping is a promising method of intervertebral disc evaluation. Significant diurnal variation and difference between levels of the lumbar spine were demonstrated. A potential use for longitudinal study in post-operative follow up or sport medicine needs to be evaluated.
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Affiliation(s)
- J Galley
- Department of Radiology, HFR Fribourg, Hôpital Cantonal, Switzerland.
| | - G Maestretti
- Department of Orthopedic Surgery, HFR Fribourg, Hôpital Cantonal, Switzerland
| | - G Koch
- Department of Radiology, HFR Fribourg, Hôpital Cantonal, Switzerland
| | - H-M Hoogewoud
- Department of Radiology, HFR Fribourg, Hôpital Cantonal, Switzerland
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Yoo YH, Yoon CS, Eun NL, Hwang MJ, Yoo H, Peters RD, Chung TS, Lee YH, Suh JS, Kim S. Interobserver and Test-Retest Reproducibility of T1ρ and T2 Measurements of Lumbar Intervertebral Discs by 3T Magnetic Resonance Imaging. Korean J Radiol 2016; 17:903-911. [PMID: 27833406 PMCID: PMC5102918 DOI: 10.3348/kjr.2016.17.6.903] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 07/15/2016] [Indexed: 12/25/2022] Open
Abstract
Objective To investigate the interobserver and test-retest reproducibility of T1ρ and T2 measurements of lumbar intervertebral discs using 3T magnetic resonance imaging (MRI). Materials and Methods This study included a total of 51 volunteers (female, 26; male, 25; mean age, 54 ± 16.3 years) who underwent lumbar spine MRI with a 3.0 T scanner. Amongst these subjects, 40 underwent repeat T1ρ and T2 measurement acquisitions with identical image protocol. Two observers independently performed the region of interest measurements in the nuclei pulposi of the discs from L1–2 through L5–S1 levels. Statistical analysis was performed using intraclass correlation coefficient (ICC) with a two-way random model of absolute agreement. Comparison of the ICC values was done after acquisition of ICC values using Z test. Statistical significance was defined as p value < 0.05. Results The ICCs of interobserver reproducibility were 0.951 and 0.672 for T1ρ and T2 mapping, respectively. The ICCs of test-retest reproducibility (40 subjects) for T1ρ and T2 measurements were 0.922 and 0.617 for observer A and 0.914 and 0.628 for observer B, respectively. In the comparison of the aforementioned ICCs, ICCs of interobserver and test-retest reproducibility for T1ρ mapping were significantly higher than T2 mapping (p < 0.001). Conclusion The interobserver and test-retest reproducibility of T1ρ mapping were significantly higher than those of T2 mapping for the quantitative assessment of nuclei pulposi of lumbar intervertebral discs.
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Affiliation(s)
- Yeon Hwa Yoo
- Department of Radiology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul 06273, Korea
| | - Choon-Sik Yoon
- Department of Radiology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul 06273, Korea
| | - Na Lae Eun
- Department of Radiology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul 06273, Korea
| | | | - Hanna Yoo
- Biostatistics Collaboration Lab, Yonsei University College of Medicine, Seoul 03722, Korea
| | | | - Tae-Sub Chung
- Department of Radiology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul 06273, Korea
| | - Young Han Lee
- Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul 03722, Korea
| | - Jin-Suck Suh
- Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul 03722, Korea
| | - Sungjun Kim
- Department of Radiology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul 06273, Korea
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Żak M, Pezowicz C. Analysis of the impact of the course of hydration on the mechanical properties of the annulus fibrosus of the intervertebral disc. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2016; 25:2681-90. [DOI: 10.1007/s00586-016-4704-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Revised: 07/05/2016] [Accepted: 07/10/2016] [Indexed: 10/21/2022]
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