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Movement Retraining using Real-time Feedback of Performance

Movement Retraining using Real-time Feedback of Performance

Published on: January 17, 2013

Pivot task increases knee frontal plane loading compared with sidestep and drop-jump.

Nelson Cortes¹, James Onate, Bonnie Van Lunen

¹Sports Medicine Assessment, Research & Testing Laboratory, George Mason University, Fairfax, Virginia 22030, USA. ncortes@gmu.edu

Journal of Sports Sciences

|November 19, 2010

Summary

This summary is machine-generated.

The pivot task increases anterior cruciate ligament (ACL) strain more than drop-jumps or sidesteps in female soccer players. Athletes adopt a more erect posture, leading to higher knee loads during pivots.

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Published on: August 30, 2016

Area of Science:

Biomechanics
Sports Medicine
Orthopedics

Background:

Anterior cruciate ligament (ACL) injuries are common in female athletes, particularly in sports involving cutting and jumping.
Understanding the biomechanical demands of different athletic tasks is crucial for injury prevention strategies.
Previous research has identified various risk factors, but direct comparisons of common evaluation tasks are limited.

Purpose of the Study:

To compare kinematic and kinetic parameters between drop-jump, sidestep cutting, and pivot tasks.
To identify which task poses a higher risk for anterior cruciate ligament (ACL) injury based on biomechanical load.

Main Methods:

Nineteen NCAA Division I female collegiate soccer athletes participated.
Participants performed three tasks: drop-jump, unanticipated sidestep cutting, and unanticipated pivot.
Kinematic and kinetic data were collected and analyzed using repeated-measures ANOVAs.

Main Results:

The pivot task demonstrated significantly lower knee flexion and higher knee valgus angles at maximum vertical ground reaction force compared to the sidestep task.
Peak posterior ground reaction force and internal varus moments were substantially higher during the pivot task than both drop-jump and sidestep tasks.
Athletes exhibited a more erect posture during the pivot task.

Conclusions:

The pivot task imposes greater biomechanical stress on the knee joint compared to drop-jump and sidestep cutting tasks.
The observed kinematic and kinetic patterns during the pivot task suggest an increased risk of anterior cruciate ligament (ACL) strain.
Athletic screening protocols should consider the distinct biomechanical demands of pivot movements for effective ACL injury risk assessment.