Biomechanical evaluation of various fixation strategies in oblique lumbar interbody fusion: a finite element analysis
Abstract Background context Typical oblique lumbar interbody fusion (OLIF) generally employed either the single lateral screw (SLS) or dual pedicle screws (DPS) for instrumentation, each with their own limitations. Purpose The study aimed to investigate the biomechanical properties of two additional...
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2025-08-01
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| Series: | BMC Musculoskeletal Disorders |
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| Online Access: | https://doi.org/10.1186/s12891-025-09008-w |
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| author | Jinyue He Jiezhong Deng Yu Xiang Yusheng Yang Sheng Liao Hui Chen Fei Luo Jianzhong Xu Zhongrong Zhang Zehua Zhang |
| author_facet | Jinyue He Jiezhong Deng Yu Xiang Yusheng Yang Sheng Liao Hui Chen Fei Luo Jianzhong Xu Zhongrong Zhang Zehua Zhang |
| author_sort | Jinyue He |
| collection | DOAJ |
| description | Abstract Background context Typical oblique lumbar interbody fusion (OLIF) generally employed either the single lateral screw (SLS) or dual pedicle screws (DPS) for instrumentation, each with their own limitations. Purpose The study aimed to investigate the biomechanical properties of two additional fixation strategies including single reverse pedicle screw (SRS) and dual overlapped screws (DOS) compared with SLS and DPS. Study design A finite element (FE) analysis study. Methods A L2-5 finite element model was established and validated with L4/5 as the experimental segment. Four fixations including SLS, SRS, DPS and DOS were established on the segment respectively. The L5’s inferior surface was set immobilized. Follower-loaded bending moments were imposed on the superior surface of L2 to record the segment’s range of motion (ROM) and maximum stress (MS) on the screws, cage and cortical bone under F-E (flexion and extension), bending (left and right) and rotation (left and right). Results The model was validated feasible through comparison with previous studies. Regarding the immediate stability: (i) the ROM was significantly lower in DPS and DOS compared to SLS and SRS during F-E and rotations; (ii) compared to DPS, DOS illustrated mildly increased ROM during F-E motions, and left rotation; (iii) compared to SLS, SRS showed an increase of ROM during flexion but a reduction in extension, without obvious distinctions during other motions. Regarding the mechanical response: (i) DPS and DOS illustrated lower MS on the screws, cortical bone and cage than SLS and SRS during most motions; (ii) Compared to DPS, DOS exhibited increased MS during most motions on the screws, cortical bone and cage; (iii) Compared to SLS, SRS demonstrated an increase of MS on the screws during flexion but an reduction during extension, along with decreased MS on cortical bone and cage during most motions. Conclusion Dual-screw systems (DPS and DOS) demonstrated enhanced immediate stability for the segment and mitigated mechanical loading for the instrument compared to single-screw systems (SLS and SRS); For the former, DOS exhibited comparable immediate stability to typical DPS, indicating the potential as a viable alternative; For the later, SRS manifested similar stability to traditional SLS, with less stress loading on the cage and cortical bone, indicating less risk of instrument failure in the long term. Clinical significance The study provides biomechanical references to achieve differentiated and individualized instrumentation for patients undergoing OLIF surgery. |
| format | Article |
| id | doaj-art-7b7448680e254ba4a7bfe1da3d338df1 |
| institution | DOAJ |
| issn | 1471-2474 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Musculoskeletal Disorders |
| spelling | doaj-art-7b7448680e254ba4a7bfe1da3d338df12025-08-20T03:04:21ZengBMCBMC Musculoskeletal Disorders1471-24742025-08-0126111010.1186/s12891-025-09008-wBiomechanical evaluation of various fixation strategies in oblique lumbar interbody fusion: a finite element analysisJinyue He0Jiezhong Deng1Yu Xiang2Yusheng Yang3Sheng Liao4Hui Chen5Fei Luo6Jianzhong Xu7Zhongrong Zhang8Zehua Zhang9Department of Orthopedics, Southwest Hospital, Army Medical UniversityDepartment of Orthopedics, Southwest Hospital, Army Medical UniversityDepartment of Orthopedics, Southwest Hospital, Army Medical UniversityDepartment of Orthopedics, Southwest Hospital, Army Medical UniversityDepartment of Orthopedics, 958 Hospital, Army Medical UniversityDepartment of Orthopedics, 958 Hospital, Army Medical UniversityDepartment of Orthopedics, Southwest Hospital, Army Medical UniversityDepartment of Orthopedics, Southwest Hospital, Army Medical UniversityDepartment of Orthopedics, 958 Hospital, Army Medical UniversityDepartment of Orthopedics, Southwest Hospital, Army Medical UniversityAbstract Background context Typical oblique lumbar interbody fusion (OLIF) generally employed either the single lateral screw (SLS) or dual pedicle screws (DPS) for instrumentation, each with their own limitations. Purpose The study aimed to investigate the biomechanical properties of two additional fixation strategies including single reverse pedicle screw (SRS) and dual overlapped screws (DOS) compared with SLS and DPS. Study design A finite element (FE) analysis study. Methods A L2-5 finite element model was established and validated with L4/5 as the experimental segment. Four fixations including SLS, SRS, DPS and DOS were established on the segment respectively. The L5’s inferior surface was set immobilized. Follower-loaded bending moments were imposed on the superior surface of L2 to record the segment’s range of motion (ROM) and maximum stress (MS) on the screws, cage and cortical bone under F-E (flexion and extension), bending (left and right) and rotation (left and right). Results The model was validated feasible through comparison with previous studies. Regarding the immediate stability: (i) the ROM was significantly lower in DPS and DOS compared to SLS and SRS during F-E and rotations; (ii) compared to DPS, DOS illustrated mildly increased ROM during F-E motions, and left rotation; (iii) compared to SLS, SRS showed an increase of ROM during flexion but a reduction in extension, without obvious distinctions during other motions. Regarding the mechanical response: (i) DPS and DOS illustrated lower MS on the screws, cortical bone and cage than SLS and SRS during most motions; (ii) Compared to DPS, DOS exhibited increased MS during most motions on the screws, cortical bone and cage; (iii) Compared to SLS, SRS demonstrated an increase of MS on the screws during flexion but an reduction during extension, along with decreased MS on cortical bone and cage during most motions. Conclusion Dual-screw systems (DPS and DOS) demonstrated enhanced immediate stability for the segment and mitigated mechanical loading for the instrument compared to single-screw systems (SLS and SRS); For the former, DOS exhibited comparable immediate stability to typical DPS, indicating the potential as a viable alternative; For the later, SRS manifested similar stability to traditional SLS, with less stress loading on the cage and cortical bone, indicating less risk of instrument failure in the long term. Clinical significance The study provides biomechanical references to achieve differentiated and individualized instrumentation for patients undergoing OLIF surgery.https://doi.org/10.1186/s12891-025-09008-wFinite element modelOblique lumbar interbody fusionRange of motionMaximum stress |
| spellingShingle | Jinyue He Jiezhong Deng Yu Xiang Yusheng Yang Sheng Liao Hui Chen Fei Luo Jianzhong Xu Zhongrong Zhang Zehua Zhang Biomechanical evaluation of various fixation strategies in oblique lumbar interbody fusion: a finite element analysis BMC Musculoskeletal Disorders Finite element model Oblique lumbar interbody fusion Range of motion Maximum stress |
| title | Biomechanical evaluation of various fixation strategies in oblique lumbar interbody fusion: a finite element analysis |
| title_full | Biomechanical evaluation of various fixation strategies in oblique lumbar interbody fusion: a finite element analysis |
| title_fullStr | Biomechanical evaluation of various fixation strategies in oblique lumbar interbody fusion: a finite element analysis |
| title_full_unstemmed | Biomechanical evaluation of various fixation strategies in oblique lumbar interbody fusion: a finite element analysis |
| title_short | Biomechanical evaluation of various fixation strategies in oblique lumbar interbody fusion: a finite element analysis |
| title_sort | biomechanical evaluation of various fixation strategies in oblique lumbar interbody fusion a finite element analysis |
| topic | Finite element model Oblique lumbar interbody fusion Range of motion Maximum stress |
| url | https://doi.org/10.1186/s12891-025-09008-w |
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