New insights into anterior cruciate ligament deficiency and reconstruction through the assessment of knee kinematic variability in terms of nonlinear dynamics

Leslie M. Decker, Constantina Moraiti, Nicholas Stergiou, Anastasios D. Georgoulis

Research output: Contribution to journalReview article

28 Citations (Scopus)

Abstract

Purpose: Injuries to the anterior cruciate ligament (ACL) occur frequently, particularly in young adult athletes, and represent the majority of the lesions of knee ligaments. Recent investigations suggest that the assessment of kinematic variability using measures of nonlinear dynamics can provide with important insights with respect to physiological and pathological states. The purpose of the present article was to critically review and synthesize the literature addressing ACL deficiency and reconstruction from a nonlinear dynamics standpoint. Methods: A literature search was carried out in the main medical databases for studies published between 1990 and 2010. Results: Seven studies investigated knee kinematic variability in ACL patients. Results provided support for the theory of "optimal movement variability". Practically, loss below optimal variability is associated with a more rigid and very repeatable movement pattern, as observed in the ACL-deficient knee. This is a state of low complexity and high predictability. On the other hand, increase beyond optimal variability is associated with a noisy and irregular movement pattern, as found in the ACL-reconstructed knee, regardless of which type of graft is used. This is a state of low complexity and low predictability. In both cases, the loss of optimal variability and the associated high complexity lead to an incapacity to respond appropriately to the environmental demands, thus providing an explanation for vulnerability to pathological changes following injury. Conclusion: Subtle fluctuations that appear in knee kinematic patterns provide invaluable insight into the health of the neuromuscular function after ACL rupture and reconstruction. It is thus critical to explore them in longitudinal studies and utilize nonlinear measures as an important component of post-reconstruction medical assessment. Level of evidence: II.

Original languageEnglish (US)
Pages (from-to)1620-1633
Number of pages14
JournalKnee Surgery, Sports Traumatology, Arthroscopy
Volume19
Issue number10
DOIs
StatePublished - Oct 1 2011

Fingerprint

Anterior Cruciate Ligament Reconstruction
Nonlinear Dynamics
Biomechanical Phenomena
Knee
Anterior Cruciate Ligament
Ligaments
Athletes
Longitudinal Studies
Rupture
Young Adult
Databases
Transplants
Health
Wounds and Injuries

Keywords

  • Biomechanics
  • Diagnosis
  • Movement variability
  • Nonlinear analysis
  • Prognosis
  • Walking

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

Cite this

New insights into anterior cruciate ligament deficiency and reconstruction through the assessment of knee kinematic variability in terms of nonlinear dynamics. / Decker, Leslie M.; Moraiti, Constantina; Stergiou, Nicholas; Georgoulis, Anastasios D.

In: Knee Surgery, Sports Traumatology, Arthroscopy, Vol. 19, No. 10, 01.10.2011, p. 1620-1633.

Research output: Contribution to journalReview article

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