Evidence for differential control of tibial position in perturbed unilateral stance after acute ACL rupture
Open Access
- 1 January 2005
- journal article
- Published by Wiley in Journal of Orthopaedic Research
- Vol. 23 (1), 54-60
- https://doi.org/10.1016/j.orthres.2004.05.011
Abstract
Functional outcomes in anterior cruciate ligament-deficient "potential copers" and "non-copers" may be related to their knee stabilization strategies. Therefore, the purpose of this study was to differentiate dynamic knee stabilization strategies of potential copers and non-copers through analysis of sagittal plane knee angle and tibia position during disturbed and undisturbed unilateral standing. Ten uninjured potential coper and non-coper subjects stood in unilateral stance on a platform that translated anteriorly, posteriorly and laterally. Knee angle and tibia position with reference to the femur were calculated before and after platform movement. During perturbation trials, potential copers maintained kinematics that were similar to uninjured subjects across conditions. Conversely, non-copers stood with greater knee flexion than uninjured subjects and a tibia position that was more posterior than the other groups. Both non-copers and potential copers demonstrated small changes in tibia position following platform movement, but direction of movement was not similar. The similarities between the knee kinematics of potential copers and uninjured subjects suggest that potential copers compensated well from their injury by utilizing analogous dynamic knee stabilization strategies. In comparison to the other groups, by keeping the knee in greater flexion and the tibia in a more posterior position, non-copers appear to constrain the tibia in response to a challenging task, which is consistent with a "stiffening strategy". Based on the poor functional outcomes of non-copers, a stiffening strategy does not lead to dynamic knee stability, and the strategy may increase compressive forces which could contribute to or exacerbate articular cartilage degeneration.Keywords
This publication has 28 references indexed in Scilit:
- Kinematics of the knee at high flexion angles: An in vitro investigationJournal of Orthopaedic Research, 2004
- Methodological concerns using intra-cortical pins to measure tibiofemoral kinematicsKnee Surgery, Sports Traumatology, Arthroscopy, 2003
- Biomechanical consequences of PCL deficiency in the knee under simulated muscle loads—an in vitro experimental studyJournal of Orthopaedic Research, 2002
- A decision-making scheme for returning patients to high-level activity with nonoperative treatment after anterior cruciate ligament ruptureKnee Surgery, Sports Traumatology, Arthroscopy, 2000
- Significance of changes in the reference position for measurements of tibial translation and diagnosis of cruciate ligament deficiencyJournal of Orthopaedic Research, 2000
- Hamstrings cocontraction reduces internal rotation, anterior translation, and anterior cruciate ligament load in weight‐bearing flexionJournal of Orthopaedic Research, 1999
- Gait and electromyographic analysis of anterior cruciate ligament deficient subjectsGait & Posture, 1996
- Fate of the ACL-injured PatientThe American Journal of Sports Medicine, 1994
- Four to ten year followup of unreconstructed anterior cruciate ligament tearsThe American Journal of Sports Medicine, 1989
- Followup of the acute nonoperated isolated anterior cruciate ligament tearThe American Journal of Sports Medicine, 1986