Does the 2D Frontal Plane Projection Angle Predict Frontal Plane Knee Moments during Stepping, Landing, and Change of Direction Tasks?
# Background Although dynamic knee valgus can be visually identified using the 2D frontal plane projection angle (FPPA), the validity of the FPPA in terms of predicting frontal plane knee kinematics has been questioned. The biomechanical utility of the FPPA may lie in its ability to predict frontal...
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| Format: | Article |
| Language: | English |
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North American Sports Medicine Institute
2022-12-01
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| Series: | International Journal of Sports Physical Therapy |
| Online Access: | https://doi.org/10.26603/001c.39612 |
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| _version_ | 1825197040545562624 |
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| author | Rachel K Straub Christopher M Powers |
| author_facet | Rachel K Straub Christopher M Powers |
| author_sort | Rachel K Straub |
| collection | DOAJ |
| description | # Background
Although dynamic knee valgus can be visually identified using the 2D frontal plane projection angle (FPPA), the validity of the FPPA in terms of predicting frontal plane knee kinematics has been questioned. The biomechanical utility of the FPPA may lie in its ability to predict frontal plane knee moments.
# Hypothesis/Purpose
The purpose of the current study was to comprehensively evaluate the ability of the FPPA to predict the frontal plane knee kinetics (peak moment, average moment, and moment at peak knee flexion) across a wide range of tasks (stepping, landing, and change of direction).
# Design
Crossover Study Design.
# Methods
Three-dimensional lower-extremity kinetics and 2D video were obtained from 39 healthy athletes (15 males and 24 females) during execution of six tasks (step down, drop jump, lateral shuffle, deceleration, triple hop, side-step-cut). Linear regression analysis was performed to determine if the 2D FPPA at peak knee flexion predicted frontal plane knee moment variables during the deceleration phase of each task (peak moment, average moment, moment at peak knee flexion).
# Results
The FPPA was found to significantly predict the peak frontal plane knee moment for two tasks (deceleration and side-step-cut, R^2^ = 12% to 25%), average frontal plane knee moment for five tasks (drop jump, shuffle, deceleration, triple hop, side-step-cut, R^2^ = 15% to 40%), and frontal plane knee moment at peak knee flexion for five tasks (drop jump, shuffle, deceleration, triple hop, side-step-cut, R2 = 16% to 45%).
# Conclusion
An increased FPPA (medial knee collapse) predicted increased knee valgus moments (or decreased knee varus moments) during landing and change of direction tasks (but not stepping). However, the predictive ability of the FPPA was weak to moderate. |
| format | Article |
| id | doaj-art-c4a98040c51c44c1a55ead698027b328 |
| institution | Kabale University |
| issn | 2159-2896 |
| language | English |
| publishDate | 2022-12-01 |
| publisher | North American Sports Medicine Institute |
| record_format | Article |
| series | International Journal of Sports Physical Therapy |
| spelling | doaj-art-c4a98040c51c44c1a55ead698027b3282025-02-11T20:27:56ZengNorth American Sports Medicine InstituteInternational Journal of Sports Physical Therapy2159-28962022-12-01177Does the 2D Frontal Plane Projection Angle Predict Frontal Plane Knee Moments during Stepping, Landing, and Change of Direction Tasks?Rachel K StraubChristopher M Powers# Background Although dynamic knee valgus can be visually identified using the 2D frontal plane projection angle (FPPA), the validity of the FPPA in terms of predicting frontal plane knee kinematics has been questioned. The biomechanical utility of the FPPA may lie in its ability to predict frontal plane knee moments. # Hypothesis/Purpose The purpose of the current study was to comprehensively evaluate the ability of the FPPA to predict the frontal plane knee kinetics (peak moment, average moment, and moment at peak knee flexion) across a wide range of tasks (stepping, landing, and change of direction). # Design Crossover Study Design. # Methods Three-dimensional lower-extremity kinetics and 2D video were obtained from 39 healthy athletes (15 males and 24 females) during execution of six tasks (step down, drop jump, lateral shuffle, deceleration, triple hop, side-step-cut). Linear regression analysis was performed to determine if the 2D FPPA at peak knee flexion predicted frontal plane knee moment variables during the deceleration phase of each task (peak moment, average moment, moment at peak knee flexion). # Results The FPPA was found to significantly predict the peak frontal plane knee moment for two tasks (deceleration and side-step-cut, R^2^ = 12% to 25%), average frontal plane knee moment for five tasks (drop jump, shuffle, deceleration, triple hop, side-step-cut, R^2^ = 15% to 40%), and frontal plane knee moment at peak knee flexion for five tasks (drop jump, shuffle, deceleration, triple hop, side-step-cut, R2 = 16% to 45%). # Conclusion An increased FPPA (medial knee collapse) predicted increased knee valgus moments (or decreased knee varus moments) during landing and change of direction tasks (but not stepping). However, the predictive ability of the FPPA was weak to moderate.https://doi.org/10.26603/001c.39612 |
| spellingShingle | Rachel K Straub Christopher M Powers Does the 2D Frontal Plane Projection Angle Predict Frontal Plane Knee Moments during Stepping, Landing, and Change of Direction Tasks? International Journal of Sports Physical Therapy |
| title | Does the 2D Frontal Plane Projection Angle Predict Frontal Plane Knee Moments during Stepping, Landing, and Change of Direction Tasks? |
| title_full | Does the 2D Frontal Plane Projection Angle Predict Frontal Plane Knee Moments during Stepping, Landing, and Change of Direction Tasks? |
| title_fullStr | Does the 2D Frontal Plane Projection Angle Predict Frontal Plane Knee Moments during Stepping, Landing, and Change of Direction Tasks? |
| title_full_unstemmed | Does the 2D Frontal Plane Projection Angle Predict Frontal Plane Knee Moments during Stepping, Landing, and Change of Direction Tasks? |
| title_short | Does the 2D Frontal Plane Projection Angle Predict Frontal Plane Knee Moments during Stepping, Landing, and Change of Direction Tasks? |
| title_sort | does the 2d frontal plane projection angle predict frontal plane knee moments during stepping landing and change of direction tasks |
| url | https://doi.org/10.26603/001c.39612 |
| work_keys_str_mv | AT rachelkstraub doesthe2dfrontalplaneprojectionanglepredictfrontalplanekneemomentsduringsteppinglandingandchangeofdirectiontasks AT christophermpowers doesthe2dfrontalplaneprojectionanglepredictfrontalplanekneemomentsduringsteppinglandingandchangeofdirectiontasks |