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Orthop J Sports Med. 2017 Jun 20;5(6):2325967117710912. doi: 10.1177/2325967117710912. eCollection 2017 Jun.

Phase-Specific Ground Reaction Force Analyses of Bilateral and Unilateral Jumps in Patients With ACL Reconstruction.

Author information

1
Department of Movement and Training Science, University of Wuppertal, Wuppertal, Germany.

Abstract

BACKGROUND:

In patients who have undergone anterior cruciate ligament (ACL) reconstruction, there is a weak correlation between subjective evaluation of knee function on questionnaires and clinical or biomechanical test results.

HYPOTHESIS:

Patients with lower subjective knee function will demonstrate lower ground-reaction forces (GRFs) in the operated leg and greater GRF asymmetries in both phase-specific and functional data analysis (FDA) approaches compared with patients with higher subjective knee function.

STUDY DESIGN:

Descriptive laboratory study.

METHODS:

The GRFs of the operated and nonoperated legs of 40 patients who previously underwent ACL reconstruction (patellar tendon) were analyzed during unilateral and bilateral countermovement jumps at a mean 2.5 years after surgery. The patients were separated into 2 groups depending on their International Knee Documentation Committee (IKDC) Subjective Form score: low IKDC and high IKDC.

RESULTS:

Both phase-specific and FDA approaches showed lower GRF values in the operated compared with the nonoperated leg within the low-IKDC group during bilateral jumps. Moreover, lower GRF values were also present in the operated and nonoperated legs in the low-IKDC group compared with those of the high-IKDC group. Differences in GRFs were predominantly observed during the eccentric deceleration phase of jumping.

CONCLUSION:

Patients with previous ACL reconstruction who have limited subjective knee function have lower GRF values and greater GRF asymmetries, suggesting the use of interlimb compensation strategies.

CLINICAL RELEVANCE:

The study results lead to a better understanding of the motor control needed during the eccentric and concentric movement phases of unilateral and bilateral jumps in patients who have undergone ACL reconstruction.

KEYWORDS:

asymmetry; concentric; eccentric; functional data analysis

Conflict of interest statement

The authors declared that they have no conflicts of interest in the authorship and publication of this contribution.

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