Influence of changing direction on the center of gravity and knee joint angle in rugby players

Norihiko Sunagawa, Toru Fukubayashi

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Abstract

    While rugby is a collision sport, many anterior cruciate ligament (ACL) injuries of the knee involve noncontact changes of direction. This study investigates the risk factors of ACL injury in rugby players by establishing the relationship between noncontact directional change by the players and the consequent alteration of the player’s center of gravity (CG) and knee joint motion. Methods: Photographs were taken when players at a university rugby football club changed their direction of movement by 45° or 90° (n = 10). The player’s motions were assessed to determine 3- and 2-dimensional coordinate values of markers on the players by using the direct linear transformation method. The values were used to calculate knee joint flexion 40 ms after foot grounding, the CG position (height and rearward position), and the abduction angle of the knee joint. A paired t test was used for statistical analysis; a probability level of less than 5 % was considered significant. Results and Discussion: No significant differences were observed in the knee flexion angle between a 45° and a 90° change in direction. However, the CG position (height and rearward position) and the abduction angle of the knee joint increased as the magnitude of the change in direction increased (p <0.01). Because increases in the rearward CG and abduction angle of the knee joint are considered risk factors for ACL injury, the risk of ACL injury is predicted to go up as the magnitude of the change in direction increases.

    Original languageEnglish
    Title of host publicationSports Injuries and Prevention
    PublisherSpringer Japan
    Pages209-220
    Number of pages12
    ISBN (Print)9784431553182, 9784431553175
    DOIs
    Publication statusPublished - 2015 Jan 1

    Fingerprint

    abduction
    Football
    Ligaments
    Gravitation
    Knee Joint
    club
    Knee
    statistical analysis
    Linear transformations
    Values
    Sports
    Electric grounding
    Statistical methods
    university
    Foot
    Direction compound
    Anterior Cruciate Ligament Injuries

    Keywords

    • ACL
    • Angle of direction change
    • Knee joint
    • Rugby union

    ASJC Scopus subject areas

    • Medicine(all)
    • Engineering(all)
    • Social Sciences(all)

    Cite this

    Sunagawa, N., & Fukubayashi, T. (2015). Influence of changing direction on the center of gravity and knee joint angle in rugby players. In Sports Injuries and Prevention (pp. 209-220). Springer Japan. https://doi.org/10.1007/978-4-431-55318-2_17

    Influence of changing direction on the center of gravity and knee joint angle in rugby players. / Sunagawa, Norihiko; Fukubayashi, Toru.

    Sports Injuries and Prevention. Springer Japan, 2015. p. 209-220.

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Sunagawa, N & Fukubayashi, T 2015, Influence of changing direction on the center of gravity and knee joint angle in rugby players. in Sports Injuries and Prevention. Springer Japan, pp. 209-220. https://doi.org/10.1007/978-4-431-55318-2_17
    Sunagawa N, Fukubayashi T. Influence of changing direction on the center of gravity and knee joint angle in rugby players. In Sports Injuries and Prevention. Springer Japan. 2015. p. 209-220 https://doi.org/10.1007/978-4-431-55318-2_17
    Sunagawa, Norihiko ; Fukubayashi, Toru. / Influence of changing direction on the center of gravity and knee joint angle in rugby players. Sports Injuries and Prevention. Springer Japan, 2015. pp. 209-220
    @inbook{8ff11ce86451413e9286a6240c80bf31,
    title = "Influence of changing direction on the center of gravity and knee joint angle in rugby players",
    abstract = "While rugby is a collision sport, many anterior cruciate ligament (ACL) injuries of the knee involve noncontact changes of direction. This study investigates the risk factors of ACL injury in rugby players by establishing the relationship between noncontact directional change by the players and the consequent alteration of the player’s center of gravity (CG) and knee joint motion. Methods: Photographs were taken when players at a university rugby football club changed their direction of movement by 45° or 90° (n = 10). The player’s motions were assessed to determine 3- and 2-dimensional coordinate values of markers on the players by using the direct linear transformation method. The values were used to calculate knee joint flexion 40 ms after foot grounding, the CG position (height and rearward position), and the abduction angle of the knee joint. A paired t test was used for statistical analysis; a probability level of less than 5 {\%} was considered significant. Results and Discussion: No significant differences were observed in the knee flexion angle between a 45° and a 90° change in direction. However, the CG position (height and rearward position) and the abduction angle of the knee joint increased as the magnitude of the change in direction increased (p <0.01). Because increases in the rearward CG and abduction angle of the knee joint are considered risk factors for ACL injury, the risk of ACL injury is predicted to go up as the magnitude of the change in direction increases.",
    keywords = "ACL, Angle of direction change, Knee joint, Rugby union",
    author = "Norihiko Sunagawa and Toru Fukubayashi",
    year = "2015",
    month = "1",
    day = "1",
    doi = "10.1007/978-4-431-55318-2_17",
    language = "English",
    isbn = "9784431553182",
    pages = "209--220",
    booktitle = "Sports Injuries and Prevention",
    publisher = "Springer Japan",

    }

    TY - CHAP

    T1 - Influence of changing direction on the center of gravity and knee joint angle in rugby players

    AU - Sunagawa, Norihiko

    AU - Fukubayashi, Toru

    PY - 2015/1/1

    Y1 - 2015/1/1

    N2 - While rugby is a collision sport, many anterior cruciate ligament (ACL) injuries of the knee involve noncontact changes of direction. This study investigates the risk factors of ACL injury in rugby players by establishing the relationship between noncontact directional change by the players and the consequent alteration of the player’s center of gravity (CG) and knee joint motion. Methods: Photographs were taken when players at a university rugby football club changed their direction of movement by 45° or 90° (n = 10). The player’s motions were assessed to determine 3- and 2-dimensional coordinate values of markers on the players by using the direct linear transformation method. The values were used to calculate knee joint flexion 40 ms after foot grounding, the CG position (height and rearward position), and the abduction angle of the knee joint. A paired t test was used for statistical analysis; a probability level of less than 5 % was considered significant. Results and Discussion: No significant differences were observed in the knee flexion angle between a 45° and a 90° change in direction. However, the CG position (height and rearward position) and the abduction angle of the knee joint increased as the magnitude of the change in direction increased (p <0.01). Because increases in the rearward CG and abduction angle of the knee joint are considered risk factors for ACL injury, the risk of ACL injury is predicted to go up as the magnitude of the change in direction increases.

    AB - While rugby is a collision sport, many anterior cruciate ligament (ACL) injuries of the knee involve noncontact changes of direction. This study investigates the risk factors of ACL injury in rugby players by establishing the relationship between noncontact directional change by the players and the consequent alteration of the player’s center of gravity (CG) and knee joint motion. Methods: Photographs were taken when players at a university rugby football club changed their direction of movement by 45° or 90° (n = 10). The player’s motions were assessed to determine 3- and 2-dimensional coordinate values of markers on the players by using the direct linear transformation method. The values were used to calculate knee joint flexion 40 ms after foot grounding, the CG position (height and rearward position), and the abduction angle of the knee joint. A paired t test was used for statistical analysis; a probability level of less than 5 % was considered significant. Results and Discussion: No significant differences were observed in the knee flexion angle between a 45° and a 90° change in direction. However, the CG position (height and rearward position) and the abduction angle of the knee joint increased as the magnitude of the change in direction increased (p <0.01). Because increases in the rearward CG and abduction angle of the knee joint are considered risk factors for ACL injury, the risk of ACL injury is predicted to go up as the magnitude of the change in direction increases.

    KW - ACL

    KW - Angle of direction change

    KW - Knee joint

    KW - Rugby union

    UR - http://www.scopus.com/inward/record.url?scp=84943369042&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84943369042&partnerID=8YFLogxK

    U2 - 10.1007/978-4-431-55318-2_17

    DO - 10.1007/978-4-431-55318-2_17

    M3 - Chapter

    SN - 9784431553182

    SN - 9784431553175

    SP - 209

    EP - 220

    BT - Sports Injuries and Prevention

    PB - Springer Japan

    ER -