The gastrocnemius muscle is an antagonist of the anterior cruciate ligament. Fleming BC(1), Renstrom PA, Ohlen G, Johnson RJ, Peura GD, Beynnon BD, Badger GJ.he gastrocnemius muscle is an antagonist of the anterior cruciate ligament. Fleming BC(1), Renstrom PA, Ohlen G, Johnson RJ, Peura GD, Beynnon BD, Badger GJ.