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Temporal kinematic differences throughout single and double-leg forward landings.

Jennifer A Hogg1, Jos Vanrenterghem2, Terry Ackerman3

  • 1University of Tennessee at Chattanooga, United States.

Journal of Biomechanics
|December 26, 2019
PubMed
Summary

Single-leg landings show riskier knee and hip movements than double-leg landings, impacting anterior cruciate ligament (ACL) injury screening. Understanding these kinematic differences is crucial for accurate injury prevention strategies.

Keywords:
ACLStatistical parametric mappingTask differencesValgus

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Area of Science:

  • Biomechanics
  • Sports Medicine
  • Orthopedics

Background:

  • Anterior cruciate ligament (ACL) injuries are common in sports.
  • Current screening methods often use double-leg landings.
  • Most ACL injuries occur during single-leg landings, yet kinematic differences are unclear.

Purpose of the Study:

  • To investigate kinematic differences between single-leg and double-leg landings.
  • To identify temporal characteristics of functional valgus collapse during landings.
  • To inform ACL injury screening protocols.

Main Methods:

  • Three-dimensional kinematics were captured during single-leg (LAND_SL) and double-leg (LAND_DL) landings.
  • Ninety participants (45 male, 45 female) were analyzed.
  • RMANOVA and Statistical Parametric Mapping (SPM) analyzed joint angles and time series data.

Main Results:

  • Single-leg landings showed greater knee abduction initially, followed by greater knee adduction.
  • Peak hip adduction was significantly higher during single-leg landings.
  • Frontal plane knee and hip movements during single-leg landings indicate potentially riskier biomechanics.

Conclusions:

  • Single-leg landings exhibit distinct kinematic patterns compared to double-leg landings.
  • These differences highlight the importance of considering landing type in ACL injury risk assessment.
  • Current screening methods may not fully capture injury risks associated with single-leg landings.