Effects of the use of oral contraceptives on hip and knee kinematics in healthy women during anterior stair descent
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Our aim was to evaluate the effects of the use of oral contraceptives (OC) on the hip and knee kinematics of healthy women during anterior stair descent.
Forty volunteers aged from 18 to 26 years were divided into two groups: 1—Group of women who had used OC for at least 3 months prior to evaluation (n = 20) and 2—Group of women who did not use OC (n = 20). The knee flexion/extension and abduction/adduction, hip flexion/extension, abduction/adduction and medial/lateral rotation excursions (degrees) were calculated for the dominant (supporting) limb during anterior stair descent. T tests for independent samples were used to compare the kinematic differences between the groups (α = 0.05).
No significant difference was verified between the groups regarding the maximum excursion of knee flexion (n.s.) and abduction (n.s.) or hip flexion (n.s.), adduction (n.s.) and medial rotation (n.s.). When considering the knee flexion at 50°, no significant difference was verified between the groups regarding the excursion of knee abduction (n.s.) or hip flexion (n.s.) adduction (n.s.) and medial/lateral rotation (n.s.).
These results suggest that the use of OC does not influence the hip and knee kinematics during anterior stair descent. Therefore, the role of this medication as a protective factor against anterior cruciate ligament injuries remains questionable.
Level of evidence
KeywordsAnterior cruciate ligament Knee joint Hip joint Oral contraceptive Kinematics
This project was financially supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)—Process no. 479177/2008-2. The authors would also like to acknowledge assistance from the PIBIC/CNPq/UFSCar.
Conflict of interest
The authors declare that there are no conflicting interest.
- 1.Abdel-Aziz YL, Kahara HM (1971) Direct linear transformation from comparator coordinates into object-space coordinates. Symposium on close-range photogrammetry. Falls Church, Va: American Society of Photogrammetry, pp 1–18Google Scholar
- 6.Baldon Rde M, Lobato DFM, Carvalho LP, Santiago PRP, Benze BG, Serrão FV (2011) Relationship between eccentric hip torque and lower-limb kinematics: Gender differences. J Appl Biomech 27(3):223–232Google Scholar
- 11.Chaudhari AMW, Lindenfeld TN, Andriacchi TP, Hewett TE, Riccobene J, Myer GD et al (2007) Knee and hip loadings patterns at different phases in the menstrual cycle: implications for the gender difference in anterior cruciate ligament injury rates. Am J Sports Med 35(5):793–800PubMedCrossRefGoogle Scholar
- 19.Heinert BL, Kernozek TW, Greany JF, Fater DCJ (2008) Hip abductor weakness and lower extremity kinematics during running. J Sport Rehabil 7(3):243–256Google Scholar
- 21.Hollman JH, Ginos BE, Kozuchowski J, Vaughn AS, Krause DA, Youdas JW (2009) Relationships between knee valgus, hip-muscle strength, and hip-muscle recruitment during single-limb step-down. J Sport Rehab 18:104–117Google Scholar
- 34.Speroff L, Fritz MA (2005) Clinical gynecologic endocrinology and infertility, 7th edn. Lippincott, Williams & Wilkins, Philadelphia, p 1334Google Scholar