| Autor: |
Utturkar GM; Duke Sports Medicine Center, Department of Orthopaedic Surgery, Duke University Medical Center, Durham, NC 27710, USA., Irribarra LA, Taylor KA, Spritzer CE, Taylor DC, Garrett WE, Defrate LE |
| Jazyk: |
angličtina |
| Zdroj: |
Annals of biomedical engineering [Ann Biomed Eng] 2013 Jan; Vol. 41 (1), pp. 123-30. Date of Electronic Publication: 2012 Aug 02. |
| DOI: |
10.1007/s10439-012-0629-x |
| Abstrakt: |
There are conflicting data regarding what motions increase ACL injury risk. More specifically, the mechanical role of valgus collapse positions during ACL injury remains controversial. Our objective was to evaluate ACL elongation in a model that mimics knee movements thought to occur during ACL injury. Eight healthy male subjects were imaged using MR and biplanar fluoroscopy to measure the in vivo elongation of the ACL and its functional bundles during three static knee positions: full extension, 30° of flexion, and a position intended to mimic a valgus collapse position described in the literature. For this study, the valgus collapse position consisted of 30° of knee flexion, internal rotation of the hip, and 10° of external tibial rotation. ACL length decreased significantly from full extension (30.2 ± 2.6 mm) to 30° of flexion (27.1 ± 2.2 mm). ACL length further decreased in the valgus collapse position (25.6 ± 2.4 mm). Both functional bundles of the ACL followed similar trends with regards to decreases in length in each of the three positions. Since strain would follow patterns of ACL length, landing on an extended knee may be a more relevant risk factor for ACL injuries than the valgus collapse position in males. Future studies should evaluate the effects of dynamic motion patterns on in vivo ACL strains. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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