The primary purpose of this study is to determine the interrater reliability and validity of the Sportcord Test as a measure of physical performance following anterior cruciate ligament (ACL) reconstruction. A secondary purpose is to systematically track subjective and objective outcomes on patients following ACL reconstruction to help identify differences between those who have subsequent knee problems and those who do not. The study hypotheses are the following:

1) The Sportcord Test will provide a valid and reliable measure of functional performance following ACL reconstruction. 2) Patients who have subsequent knee problems in the 12 month study period will exhibit different scores on clinical special tests compared to those who do not.

Inclusion Criteria:

• Undergoing surgical reconstruction for a torn ACL.
• Returning to participation in a sport(s).
• Will receive physical therapy/rehabilitation after surgical reconstruction for a torn ACL.
• Between ages of 10 and 50.

Exclusion Criteria:

• Non-weight bearing.
• At least 12 weeks removed from surgery.
• Unable to walk, squat, or jump/land without pain in the surgically repaired knee.

Patients receiving physical therapy/rehabilitation for an ACL surgery and are returning to participation in sports.