The value of fixed segment mobility in posterior dynamic stabilization: a single-center retrospective study
Abstract Purpose This study aims to compare the effects of two generations of the Isobar dynamic fixation system—Isobar TTL (first-generation, less mobile) and Isobar EVO (second-generation, more mobile)—on the surgical and adjacent intervertebral disc segments, based on MRI findings. Methods A retr...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
BMC
2025-02-01
|
| Series: | BMC Musculoskeletal Disorders |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s12891-025-08333-4 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832572075947065344 |
|---|---|
| author | Yulu Sun Jianbin Guan Hao Chen Xiaojie Sun Kaitan Yang Qing Fang |
| author_facet | Yulu Sun Jianbin Guan Hao Chen Xiaojie Sun Kaitan Yang Qing Fang |
| author_sort | Yulu Sun |
| collection | DOAJ |
| description | Abstract Purpose This study aims to compare the effects of two generations of the Isobar dynamic fixation system—Isobar TTL (first-generation, less mobile) and Isobar EVO (second-generation, more mobile)—on the surgical and adjacent intervertebral disc segments, based on MRI findings. Methods A retrospective analysis was conducted on 29 patients treated with fenestrated decompression and Isobar EVO stabilization and 34 patients treated with fenestrated decompression and Isobar TTL stabilization. Clinical outcomes and radiographic parameters, including the disc height index (DHI) and range of motion (ROM) of the surgical and upper adjacent segments, lateral neural foraminal protrusion value (LNPV) of the upper adjacent segment, and Pfirrmann grading of disc degeneration, were evaluated and compared between the two groups. Results At the 48-month follow-up, no significant differences in Visual Analog Scale (VAS) scores or Oswestry Disability Index (ODI) were observed between the two groups (P > 0.01). The EVO group demonstrated significantly higher surgical segment DHI and ROM compared to the TTL group (P < 0.01). Meanwhile, the upper adjacent segment ROM was significantly lower in the EVO group compared to the TTL group at the final follow-up (P < 0.01). Additionally, the upper adjacent segment LNPV was larger in the EVO group than in the TTL group (P < 0.01). Pfirrmann grading revealed greater degeneration in surgical segments treated with TTL compared to EVO (P = 0.008). Conclusion Compared to the first-generation, less mobile Isobar TTL, the second-generation, more mobile Isobar EVO offers superior preservation of the surgical segment and slows the progression of degeneration in the upper adjacent segments. These findings highlight the benefits of greater mobility in posterior dynamic stabilization devices. |
| format | Article |
| id | doaj-art-74bdcc3281484c7ab8c48c6beb4d4ccf |
| institution | Kabale University |
| issn | 1471-2474 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Musculoskeletal Disorders |
| spelling | doaj-art-74bdcc3281484c7ab8c48c6beb4d4ccf2025-02-02T12:05:28ZengBMCBMC Musculoskeletal Disorders1471-24742025-02-0126111210.1186/s12891-025-08333-4The value of fixed segment mobility in posterior dynamic stabilization: a single-center retrospective studyYulu Sun0Jianbin Guan1Hao Chen2Xiaojie Sun3Kaitan Yang4Qing Fang5Yangling Demonstration Zone HospitalHonghui-hospital, Xi’an Jiaotong UniversityHonghui-hospital, Xi’an Jiaotong UniversityHonghui-hospital, Xi’an Jiaotong UniversityHonghui-hospital, Xi’an Jiaotong UniversityHonghui-hospital, Xi’an Jiaotong UniversityAbstract Purpose This study aims to compare the effects of two generations of the Isobar dynamic fixation system—Isobar TTL (first-generation, less mobile) and Isobar EVO (second-generation, more mobile)—on the surgical and adjacent intervertebral disc segments, based on MRI findings. Methods A retrospective analysis was conducted on 29 patients treated with fenestrated decompression and Isobar EVO stabilization and 34 patients treated with fenestrated decompression and Isobar TTL stabilization. Clinical outcomes and radiographic parameters, including the disc height index (DHI) and range of motion (ROM) of the surgical and upper adjacent segments, lateral neural foraminal protrusion value (LNPV) of the upper adjacent segment, and Pfirrmann grading of disc degeneration, were evaluated and compared between the two groups. Results At the 48-month follow-up, no significant differences in Visual Analog Scale (VAS) scores or Oswestry Disability Index (ODI) were observed between the two groups (P > 0.01). The EVO group demonstrated significantly higher surgical segment DHI and ROM compared to the TTL group (P < 0.01). Meanwhile, the upper adjacent segment ROM was significantly lower in the EVO group compared to the TTL group at the final follow-up (P < 0.01). Additionally, the upper adjacent segment LNPV was larger in the EVO group than in the TTL group (P < 0.01). Pfirrmann grading revealed greater degeneration in surgical segments treated with TTL compared to EVO (P = 0.008). Conclusion Compared to the first-generation, less mobile Isobar TTL, the second-generation, more mobile Isobar EVO offers superior preservation of the surgical segment and slows the progression of degeneration in the upper adjacent segments. These findings highlight the benefits of greater mobility in posterior dynamic stabilization devices.https://doi.org/10.1186/s12891-025-08333-4Dynamic stabilizationNon-fusionLumbar degenerative diseasesAdjacent segment degenerationIsobar system |
| spellingShingle | Yulu Sun Jianbin Guan Hao Chen Xiaojie Sun Kaitan Yang Qing Fang The value of fixed segment mobility in posterior dynamic stabilization: a single-center retrospective study BMC Musculoskeletal Disorders Dynamic stabilization Non-fusion Lumbar degenerative diseases Adjacent segment degeneration Isobar system |
| title | The value of fixed segment mobility in posterior dynamic stabilization: a single-center retrospective study |
| title_full | The value of fixed segment mobility in posterior dynamic stabilization: a single-center retrospective study |
| title_fullStr | The value of fixed segment mobility in posterior dynamic stabilization: a single-center retrospective study |
| title_full_unstemmed | The value of fixed segment mobility in posterior dynamic stabilization: a single-center retrospective study |
| title_short | The value of fixed segment mobility in posterior dynamic stabilization: a single-center retrospective study |
| title_sort | value of fixed segment mobility in posterior dynamic stabilization a single center retrospective study |
| topic | Dynamic stabilization Non-fusion Lumbar degenerative diseases Adjacent segment degeneration Isobar system |
| url | https://doi.org/10.1186/s12891-025-08333-4 |
| work_keys_str_mv | AT yulusun thevalueoffixedsegmentmobilityinposteriordynamicstabilizationasinglecenterretrospectivestudy AT jianbinguan thevalueoffixedsegmentmobilityinposteriordynamicstabilizationasinglecenterretrospectivestudy AT haochen thevalueoffixedsegmentmobilityinposteriordynamicstabilizationasinglecenterretrospectivestudy AT xiaojiesun thevalueoffixedsegmentmobilityinposteriordynamicstabilizationasinglecenterretrospectivestudy AT kaitanyang thevalueoffixedsegmentmobilityinposteriordynamicstabilizationasinglecenterretrospectivestudy AT qingfang thevalueoffixedsegmentmobilityinposteriordynamicstabilizationasinglecenterretrospectivestudy AT yulusun valueoffixedsegmentmobilityinposteriordynamicstabilizationasinglecenterretrospectivestudy AT jianbinguan valueoffixedsegmentmobilityinposteriordynamicstabilizationasinglecenterretrospectivestudy AT haochen valueoffixedsegmentmobilityinposteriordynamicstabilizationasinglecenterretrospectivestudy AT xiaojiesun valueoffixedsegmentmobilityinposteriordynamicstabilizationasinglecenterretrospectivestudy AT kaitanyang valueoffixedsegmentmobilityinposteriordynamicstabilizationasinglecenterretrospectivestudy AT qingfang valueoffixedsegmentmobilityinposteriordynamicstabilizationasinglecenterretrospectivestudy |