The Lower Extremity Assessment Protocol (LEAP) is a program to prevent reinjury and promote long-term health by characterizing muscle function, evaluating movement performance, and monitoring patient-reported outcomes (e.g., pain). The purpose of this study is to learn more about the outcomes following orthopaedic surgery after a lower limb injury. *This study is a collaboration with the UNC Sports Medicine Institute*

Many young athletes who tear their ACL have trouble getting back to sport or suffer a second ACL injury once they do. We aim to improve athletes' ability to get back to sport safely. We want to make the activities athletes perform in rehabilitation more closely match the demands of what they do once they return to their sport. We also aim to develop low-cost ways to measure how the knee is moving during those activities. *This study is a collaboration with the UNC Sports Medicine Institute*

Individuals with a history of anterior cruciate ligament (ACL) injury and have had an ACL reconstruction (ACLR) are at a greater risk for developing osteoarthritis. The greater risk for developing osteoarthritis is likely caused by too little force or physical activity applied to the knee during weightbearing tasks such as walking. To reduce this decrease in forces during walking following an ACLR, we must first develop effective treatments that can train a person to walk in a way that reduces their risk of developing osteoarthritis. The purpose of this research study is to determine the feasibility and the initial effects of a 6-week training program designed to improve walking mechanics of individuals with an ACL reconstruction.

Have you recently had an anterior cruciate ligament re-injury and will be undergoing revision anterior cruciate ligament reconstruction surgery? If so, you may be able to participate in a study assessing the associations between walking movement and physical activity with knee joint health. Compensation provided.

Are you scheduled for or have you recently undergone ACL reconstruction surgery? You may be able to participate in a study research study to help us learn if a new form of rehabilitation improves outcomes. All rehabilitation/physical therapy costs are covered by the study. Compensation is also provided. All of the groups will receive standard care treatment, but two of the groups will also receive different types of vibration.

The purpose of this study is to examine the effects of rehabilitation on short and long-term outcomes following lateral ankle sprain. This study is a collaboration with the UNC Sports Medicine Institute.