Recently, studies have pointed to greater knee joint
laxity (KJL) as a potential contributor to the
higher rate of ACL injury among female athletes with
some researchers reporting that hormones influence
joint laxity throughout the menstrual cycle.
However, how changes in KJL during the menstrual
cycle affect knee joint loading, which ultimately
leads to ACL injury, has not been investigated.

Increased KJL was observed during ovulation in most
female subjects; however, subject variations
corresponding to hormonal fluctuations were
detected. When this subject variation was...