title: The relation between static and dynamic knee stability after ACL reconstruction.
abstract: The purpose of this prospective study was to quantify and compare the amount of anterior tibial translation (ATT) occurring in ACL-reconstructed knees during both a static passive Lachman test and an isokinetic knee extension exercise, pre- and postoperatively. Stress-radiography combined with an electrogoniometer system was applied to 49 knees before and after ACL reconstruction. The Lysholm score was calculated and subjective evaluation assessed before operation and at follow-up. Both measurement methods confirmed a significant decrease of ATT after surgery. Side-to-side differences in ATT were seen in the passive Lachman test postoperatively, and were not found during isokinetic extension from 90 degrees to 0 degree. There was no significant correlation between static passive stability and the functional knee score at follow-up. In addition, the patients with a more than 3 mm side-to-side difference in the passive Lachman test after surgery, showed less than a 1 mm side-to-side difference during isokinetic exercise at a flexion angle of 20 degrees. These results suggest that ACL reconstruction improves ATT in both tests, but the side-to-side difference is greater with the static Lachman test.
authors.affiliation: Department of Orthopaedic Surgery, Gunma University Faculty of Medicine, 3-39-22 Showa-machi, Maebashi-shi, Gunma-ken 371-8511, Japan. higuchih@med.gunma-u.ac.jp
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Higuchi
authors.forename: Masanori
authors.initials: M
authors.lastname: Terauchi
authors.forename: Masashi
authors.initials: M
authors.lastname: Kimura
authors.forename: Atsushi
authors.initials: A
authors.lastname: Kobayashi
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Takeda
authors.forename: Hideomi
authors.initials: H
authors.lastname: Watanabe
authors.forename: Kenji
authors.initials: K
authors.lastname: Takagishi
mesh_terms: D000293:Adolescent; D000328:Adult; D016118:Anterior Cruciate Ligament / Q000503:physiopathology / Q000601:surgery*; D000070598:Anterior Cruciate Ligament Injuries; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D007718:Knee Injuries / Q000000981:diagnostic imaging / Q000503:physiopathology*; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000503:physiopathology*; D008297:Male; D011446:Prospective Studies; D011859:Radiography; D016059:Range of Motion, Articular