Have you had or are planning to have ACL reconstruction? You may be able to take part in a research study to help us learn more about the outcomes following surgery after a lower limb injury. We are also looking for healthy volunteers between the ages of 12-64 to take part. We will provide you with a report of your results after testing!

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*

The primary purpose is to characterize prevalence of contraceptive types among adult females. A secondary aim will be to understand factors impacting satisfaction and contraceptive history. *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.

Impact of Chronic Ankle Instability on Ankle Cartilage Behavior in Response to Mechanical Loading. *This study is a collaboration with the UNC Sports Medicine Institute*

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.

This study is a collaboration with the UNC Sports Medicine Institute and aims to determine the effect of local muscle vibration on gastrocnemius and soleus muscle activity, postural control, and strength in those with chronic ankle instability (CAI).