BACKGROUND: Gender differences in passive frontal plane knee stiffness may contribute to
the increased anterior cruciate ligament injury rate in females. Gender-based stiffness
differences have been attributed to anthropometric variations, but little data exist describing
this relationship. Furthermore, sex hormone levels appear to influence joint stiffness, but the
differential effects of instantaneous and prior hormonal concentrations remain unknown.
This study sought to explore the effect of gender, prior hormonal status, and anthropometry …