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Hamstring strength asymmetry altered involved knee mechanics after ACL reconstruction
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Compared with patients who had symmetric hamstring strength after ACL reconstruction, recently published results showed patients with hamstring strength asymmetry after reconstruction experienced altered involved knee mechanics for the sagittal plane during gait and for the transverse plane during gait and jogging.
Researchers subcategorized 45 patients who underwent ACL reconstruction into either a symmetric hamstring or asymmetric hamstring group using a limb symmetry index for isometric hamstring strength. Researchers collected involved knee kinematic and kinetic data using 3-D motion analysis during gait and jogging, and calculated peak sagittal-, frontal- and transverse-plane knee angles and sagittal-plane knee moments and knee powers.
Results showed the symmetric hamstring and asymmetric hamstring groups had no differences in sagittal- and frontal-plane knee angles. Compared with the symmetric hamstring group, researchers noted a decreased tibial internal rotation during weight acceptance in gait among patients with asymmetrical hamstrings. Patients with asymmetrical hamstrings also experienced increased tibial external rotation during jogging at initial contact and during weight acceptance, according to results. After controlling for gait speed, researchers found decreased peak negative knee power during mid-stance during gait among patients with asymmetric hamstrings vs. symmetric hamstrings. – by Casey Tingle
Disclosures: Abourezk reports no relevant financial disclosures. Please see the full study for a list of all other authors’ relevant financial disclosures.
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