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Birth control pill linked to reduced knee injury

Saturday, Mar 19, 2016,16:30 IST By Metrovaartha A A A

Houston | Women who take birth control pill are less likely to suffer serious knee injuries as the medicine lessens and stabilises estrogen levels, according to a new study. Female athletes are 1.5 to two times more likely than their male counterparts to injure their Anterior Cruciate Ligament (ACL), researchers from the University of Texas in the US have said.

The ACL is a ligament that connects the top and bottom portions of the knee. Damage to this ligament is a serious athletic injury that can be career altering. Return-to-play rates after ACL injury are as low as 49 per cent among soccer players. Also, this injury may lead to lifelong issues with knee instability, altered walking gait and early onset arthritis, researchers said.

Using a national insurance claims and prescription database of 23,428 young women between 15 and 19, the study found that women with an ACL knee injury who were taking the birth control pill were less likely to need corrective surgery than women of the same age with ACL injuries who do not use the birth control pill.

Researchers have proposed that the female hormone estrogen makes women more vulnerable to ACL injury by weakening this ligament. A previous investigation found that more ACL injuries in women occur during the points of their menstrual cycle when estrogen levels are high. Birth control pills help maintain lower and more consistent levels of estrogen, which may prevent periodic ACL weakness. With this in mind, we examined whether oral contraceptive use protected against ACL injuries that require surgery in women, said Aaron Grey from the University. Women between 15-19 years in need of ACL reconstructive surgery, the age group with the highest rates of ACL injuries by a wide margin, were 22 per cent less likely to be using the birth control pill than non-injured women of the same age, researchers said.

Gray said that puberty might explain the high number of ACL injury cases in young women of this age. During puberty, there is a sharp rise in estrogen levels as well as growth spurts in the legs. Following one of these growth spurts, it takes time for the adolescent to develop good coordination with their newly elongated limbs. Young athletes currently use birth control pills for various reasons including more predictable cycles and lighter periods. Injury risk reduction could potentially be added to that list with further, prospective investigations, he said.

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