Posterolateral inter-transverse lumbar fusion in a mouse model
<p>Abstract</p> <p>Background</p> <p>Spinal fusion is a common orthopaedic procedure that has been previously modeled using canine, lapine, and rodent subjects. Despite the increasing availability of genetically modified mouse strains, murine models have only been infre...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
BMC
2013-01-01
|
| Series: | Journal of Orthopaedic Surgery and Research |
| Subjects: | |
| Online Access: | http://www.josr-online.com/content/8/1/2 |
| _version_ | 1811185178346782720 |
|---|---|
| author | Bobyn Justin Rasch Anton Little David G Schindeler Aaron |
| author_facet | Bobyn Justin Rasch Anton Little David G Schindeler Aaron |
| author_sort | Bobyn Justin |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p>Spinal fusion is a common orthopaedic procedure that has been previously modeled using canine, lapine, and rodent subjects. Despite the increasing availability of genetically modified mouse strains, murine models have only been infrequently described.</p> <p>Purpose</p> <p>To present an efficient and minimally traumatic procedure for achieving spinal fusion in a mouse model and determine the optimal rhBMP-2 dose to achieve sufficient fusion mass.</p> <p>Method</p> <p>MicroCT reconstructions of the unfused mouse spine and human spine were compared to design a surgical approach. In phase 1, posterolateral lumbar spine fusion in the mouse was evaluated using 18 animals allocated to three experimental groups. Group 1 received decortication only (n = 3), Group 2 received 10 μg rhBMP-2 in a collagen sponge bilaterally (n = 6), and Group 3 received 10 μg rhBMP-2 + decortication (n = 9). The surgical technique was assessed for intra-operative safety, efficacy, access and reproducibility. Spines were harvested for analysis at 3 weeks (Groups 1, 2) and 1, 2, and 3 weeks (Group 3). In phase 2, a dose response study was carried out in an additional 18 animals with C57BL6 mice receiving sponges containing 0, 0.5, 1, 2.5, 5 μg of rhBMP-2 per sponge bilaterally.</p> <p>Results</p> <p>The operative procedure via midline access was rapid and reproducible, and fusion of the murine articular processes was found to be analogous to the human procedure. Unlike reports from other species, decortication alone (Group 1) yielded no new bone formation. Addition of rhBMP-2 (Groups 2 and 3) yielded a significant bone mass that bridged the L4-L6 vertebrae. The subsequent dose response experiment revealed that 0.5 μg rhBMP-2 per sponge was sufficient to create a fusion mass.</p> <p>Conclusion</p> <p>We describe a new approach for mouse lumbar spine fusion that is safe, efficient, and highly reproducible. The technique we employed is analogous to the human midline procedure and may be highly suitable for genetically modified mouse models.</p> |
| first_indexed | 2024-04-11T13:26:04Z |
| format | Article |
| id | doaj.art-c7e3335a6d5a4afb94eac44846a8e9eb |
| institution | Directory Open Access Journal |
| issn | 1749-799X |
| language | English |
| last_indexed | 2024-04-11T13:26:04Z |
| publishDate | 2013-01-01 |
| publisher | BMC |
| record_format | Article |
| series | Journal of Orthopaedic Surgery and Research |
| spelling | doaj.art-c7e3335a6d5a4afb94eac44846a8e9eb2022-12-22T04:22:05ZengBMCJournal of Orthopaedic Surgery and Research1749-799X2013-01-0181210.1186/1749-799X-8-2Posterolateral inter-transverse lumbar fusion in a mouse modelBobyn JustinRasch AntonLittle David GSchindeler Aaron<p>Abstract</p> <p>Background</p> <p>Spinal fusion is a common orthopaedic procedure that has been previously modeled using canine, lapine, and rodent subjects. Despite the increasing availability of genetically modified mouse strains, murine models have only been infrequently described.</p> <p>Purpose</p> <p>To present an efficient and minimally traumatic procedure for achieving spinal fusion in a mouse model and determine the optimal rhBMP-2 dose to achieve sufficient fusion mass.</p> <p>Method</p> <p>MicroCT reconstructions of the unfused mouse spine and human spine were compared to design a surgical approach. In phase 1, posterolateral lumbar spine fusion in the mouse was evaluated using 18 animals allocated to three experimental groups. Group 1 received decortication only (n = 3), Group 2 received 10 μg rhBMP-2 in a collagen sponge bilaterally (n = 6), and Group 3 received 10 μg rhBMP-2 + decortication (n = 9). The surgical technique was assessed for intra-operative safety, efficacy, access and reproducibility. Spines were harvested for analysis at 3 weeks (Groups 1, 2) and 1, 2, and 3 weeks (Group 3). In phase 2, a dose response study was carried out in an additional 18 animals with C57BL6 mice receiving sponges containing 0, 0.5, 1, 2.5, 5 μg of rhBMP-2 per sponge bilaterally.</p> <p>Results</p> <p>The operative procedure via midline access was rapid and reproducible, and fusion of the murine articular processes was found to be analogous to the human procedure. Unlike reports from other species, decortication alone (Group 1) yielded no new bone formation. Addition of rhBMP-2 (Groups 2 and 3) yielded a significant bone mass that bridged the L4-L6 vertebrae. The subsequent dose response experiment revealed that 0.5 μg rhBMP-2 per sponge was sufficient to create a fusion mass.</p> <p>Conclusion</p> <p>We describe a new approach for mouse lumbar spine fusion that is safe, efficient, and highly reproducible. The technique we employed is analogous to the human midline procedure and may be highly suitable for genetically modified mouse models.</p>http://www.josr-online.com/content/8/1/2SpineFusionArthrodesisMouseBMP |
| spellingShingle | Bobyn Justin Rasch Anton Little David G Schindeler Aaron Posterolateral inter-transverse lumbar fusion in a mouse model Journal of Orthopaedic Surgery and Research Spine Fusion Arthrodesis Mouse BMP |
| title | Posterolateral inter-transverse lumbar fusion in a mouse model |
| title_full | Posterolateral inter-transverse lumbar fusion in a mouse model |
| title_fullStr | Posterolateral inter-transverse lumbar fusion in a mouse model |
| title_full_unstemmed | Posterolateral inter-transverse lumbar fusion in a mouse model |
| title_short | Posterolateral inter-transverse lumbar fusion in a mouse model |
| title_sort | posterolateral inter transverse lumbar fusion in a mouse model |
| topic | Spine Fusion Arthrodesis Mouse BMP |
| url | http://www.josr-online.com/content/8/1/2 |
| work_keys_str_mv | AT bobynjustin posterolateralintertransverselumbarfusioninamousemodel AT raschanton posterolateralintertransverselumbarfusioninamousemodel AT littledavidg posterolateralintertransverselumbarfusioninamousemodel AT schindeleraaron posterolateralintertransverselumbarfusioninamousemodel |