In-vivo Anterior Cruciate Ligament Elongation in Response to Axial Tibial Loads
Background: The knowledge of in vivo anterior cruciate ligament (ACL) deformation is fundamental for understanding ACL injury mechanisms and for improving surgical reconstruction of the injured ACL. This study investigated the relative elongation of the ACL when the knee is subject to no load (<...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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Springer Japan
2009
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| Online Access: | http://hdl.handle.net/1721.1/49480 |
| _version_ | 1826204819809894400 |
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| author | Hosseini, Ali Gill, Thomas J. Li, Guoan |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Hosseini, Ali Gill, Thomas J. Li, Guoan |
| author_sort | Hosseini, Ali |
| collection | MIT |
| description | Background: The knowledge of in vivo anterior cruciate ligament (ACL) deformation is fundamental for understanding ACL injury mechanisms and for improving surgical reconstruction of the injured ACL. This study investigated the relative elongation of the ACL when the knee is subject to no load (<10 N) and then to full body weight (axial tibial load) at various flexion angles using a combined dual fluoroscopic and magnetic resonance imaging (MRI) technique.
Methods: Nine healthy subjects were scanned with MRI and imaged when one knee was subject to no load and then to full body weight using a dual fluoroscopic system (0°–45° flexion angles). The ACL was analyzed using three models: a single central bundle; an anteromedial and posterolateral (double functional) bundle; and multiple (eight) surface fiber bundles.
Results: The anteromedial bundle had a peak relative elongation of 4.4% ± 3.4% at 30° and that of the posterolateral bundle was 5.9% ± 3.4% at 15°. The ACL surface fiber bundles at the posterior portion of the ACL were shorter in length than those at the anterior portion. However, the peak relative elongation of one posterolateral fiber bundle reached more than 13% whereas one anteromedial fiber bundle reached a peak relative elongation of only about 3% at 30° of flexion by increasing the axial tibial load from no load to full body weight.
Conclusions: The data quantitatively demonstrated that under external loading the ACL experiences nonhomogeneous elongation, with the posterior fiber bundles stretching more than the anterior fiber bundles. |
| first_indexed | 2024-09-23T13:01:38Z |
| format | Article |
| id | mit-1721.1/49480 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:01:38Z |
| publishDate | 2009 |
| publisher | Springer Japan |
| record_format | dspace |
| spelling | mit-1721.1/494802022-09-28T11:34:45Z In-vivo Anterior Cruciate Ligament Elongation in Response to Axial Tibial Loads Hosseini, Ali Gill, Thomas J. Li, Guoan Massachusetts Institute of Technology. Department of Mechanical Engineering Hosseini, Ali Hosseini, Ali Background: The knowledge of in vivo anterior cruciate ligament (ACL) deformation is fundamental for understanding ACL injury mechanisms and for improving surgical reconstruction of the injured ACL. This study investigated the relative elongation of the ACL when the knee is subject to no load (<10 N) and then to full body weight (axial tibial load) at various flexion angles using a combined dual fluoroscopic and magnetic resonance imaging (MRI) technique. Methods: Nine healthy subjects were scanned with MRI and imaged when one knee was subject to no load and then to full body weight using a dual fluoroscopic system (0°–45° flexion angles). The ACL was analyzed using three models: a single central bundle; an anteromedial and posterolateral (double functional) bundle; and multiple (eight) surface fiber bundles. Results: The anteromedial bundle had a peak relative elongation of 4.4% ± 3.4% at 30° and that of the posterolateral bundle was 5.9% ± 3.4% at 15°. The ACL surface fiber bundles at the posterior portion of the ACL were shorter in length than those at the anterior portion. However, the peak relative elongation of one posterolateral fiber bundle reached more than 13% whereas one anteromedial fiber bundle reached a peak relative elongation of only about 3% at 30° of flexion by increasing the axial tibial load from no load to full body weight. Conclusions: The data quantitatively demonstrated that under external loading the ACL experiences nonhomogeneous elongation, with the posterior fiber bundles stretching more than the anterior fiber bundles. 2009-10-19T13:41:01Z 2009-10-19T13:41:01Z 2009-06 2008-07 Article http://purl.org/eprint/type/SubmittedJournalArticle 1436-2023 0949-2658 http://hdl.handle.net/1721.1/49480 Hosseini A, Gill T, Li G. In vivo anterior cruciate ligament elongation in response to axial tibial loads. Journal of Orthopaedic Science. 2009;14(3):298-306. en_US http://dx.doi.org/10.1007/s00776-009-1325-z Journal of Orthopaedic Science Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. http://www.springerlink.com/help/disclaimer.mpx application/pdf Springer Japan Ali Hosseini |
| spellingShingle | Hosseini, Ali Gill, Thomas J. Li, Guoan In-vivo Anterior Cruciate Ligament Elongation in Response to Axial Tibial Loads |
| title | In-vivo Anterior Cruciate Ligament Elongation in Response to Axial Tibial Loads |
| title_full | In-vivo Anterior Cruciate Ligament Elongation in Response to Axial Tibial Loads |
| title_fullStr | In-vivo Anterior Cruciate Ligament Elongation in Response to Axial Tibial Loads |
| title_full_unstemmed | In-vivo Anterior Cruciate Ligament Elongation in Response to Axial Tibial Loads |
| title_short | In-vivo Anterior Cruciate Ligament Elongation in Response to Axial Tibial Loads |
| title_sort | in vivo anterior cruciate ligament elongation in response to axial tibial loads |
| url | http://hdl.handle.net/1721.1/49480 |
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