The purpose of this research study is to see if we can use micro-doppler signal technology to determine if someone has had an ACL reconstruction in the past. We will do this by comparing a group of people who have had the surgery against a group who has never had this surgery to see if this technology can tell the difference.

If you join this study you would be asked to come to a one-hour appointment at the Lebanon Valley College campus in Annville, PA and perform a variety of activities that are part of daily life, such as walking, jumping, and standing from a seated position. We'll ask you to complete a questionnaire on any musculoskeletal pain you're experiencing and report your demographic information.

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