Variations in Varus/Valgus and Internal/External Rotational Knee Laxity and Stiffness Across the Menstrual Cycle

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
Randy J. Schmitz, Associate Professor (Creator)
Sandra J. Shultz, Professor and Chair (Creator)
The University of North Carolina at Greensboro (UNCG )
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Abstract: Cyclic variations in genu recurvatum (GR), general joint laxity (GJL), varus–valgus (VV), and internal–external (IER) rotational laxities and stiffnesses were examined in 64 females and 43 males at two time points during the females' menstrual cycle [days of minimum (T1) and maximum (T2) anterior knee laxity (AKL)]. Cyclic increases in AKL (9.5%), GR (37.5%), and GJL (13.6%) were observed in females but not males from T1 to T2 (p<0.001). Cyclic increases in VV and IER laxity were negligible (1.5–3.2%, p>0.320). Females compared to males had lower overall VV stiffness at T2 (F 37%

Additional Information

Journal of Orthopaedic Research, 29(3), 318-325
Language: English
Date: 2011
ACL injury risk, knee biomechanics, hormone response, knee laxity, menstrual cycle

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