Dynamic stability after ACL injury: who can hop? Rudolph KS, Axe MJ and Snyder-Mackler L. Knee Surg Sports Traumatol Arthrosc. 2000;8(5):262-9.
Hop tests as predictors of dynamic knee stability. Fitzgerald GK, Lephart SM, Hwang JH and Wainner RS. J Orthop Sports Phys Ther. 2001 Oct;31(10):588-97.
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