The goal of this study is to compare quadriceps muscle activation in patients recovering from lower extremity injury, such as an ACL tear. Specifically, the main objectives are as follows: * Determine the effects of ankle positioning on quad muscle activation during straight leg raise exercises performed while the patient is lying on his or her back * Determine if there is a difference between ankle positioning on quad muscle activation during straight leg raise exercises performed while the patient is lying on his or her back, comparing healthy versus post-operative participants
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Noraxon Ultium EMG
Timeframe: Within first 28 days post-op (Arthroscopy patients); healthy patients tested at enrollment