Article

OBJECTIVE: To compare landing mechanics and neuromuscular recruitment strategies
between women with semitendinosus-gracilis anterior cruciate ligament
reconstruction (SG-ACLr) and noninjured women during double- and single-legged
drop jumps. DESIGN: Cross-sectional biomechanical study. SETTING: Single
university-based biomechanics laboratory. PARTICIPANTS: Fourteen women 1-5 years
post-SG-ACLr and 16 noninjured women participated in this study. METHODS: After
anthropometric measurements, warm-up, and familiarization procedures,
participants performed 5 trials of a double- and single-legged drop jumps. MAIN
OUTCOME MEASUREMENTS: Dynamic knee valgus was measured as the distance between
knee joints during the landing phase of the double-leg drop jumps. Medial knee
displacement was the outcome considered during the landing phase of the
single-leg drop jumps. For both drop jump tasks, neuromuscular recruitment was
evaluated through rectified normalized electromyographic activity of the
quadriceps and hamstrings (amplitude and latency), and quadriceps/hamstrings
electromyographic co-contraction ratio. RESULTS: Although the SG-ACLr group
demonstrated a tendency toward a greater dynamic knee valgus during both drop
jumps, these differences did not reach statistical significance. EMG data
revealed different neuromuscular strategies for each group, depending on the
specific jump. CONCLUSIONS: These findings suggest that women with SG-ACLr have a
tendency toward greater dynamic knee valgus that could predispose to additional
knee injuries. Rehabilitation specialists need to be aware of existing kinematic
and neuromuscular deficiencies years after SG-ACLr. Taking this into
consideration will aid in prescribing appropriate interventions designed to
prevent re-injury.
CI - Copyright (c) 2014 American Academy of Physical Medicine and Rehabilitation.
Published by Elsevier Inc. All rights reserved.

Langue : ANGLAIS