Musculoskeletal injuries (MSKI) affect muscles, bones, and joints, while traumatic brain injury (TBI) is a head injury that can cause problems with thinking and movement. A concussion is a mild TBI. This study aims to understand why people, especially those in the military or active individuals, are at higher risk for MSKI after a concussion. The researchers believe that a concussion affects the way muscles and nerves work together, increasing the risk of injury.

The study will compare people with and without concussions to see how their bodies control movement. Participants will undergo tests within 5 days after feeling better from a concussion and follow-ups at 6 weeks and 12 weeks. This research will help develop ways to prevent injuries after a concussion.

• Participants receive no direct treatment but help advance understanding of injury risks.
• Tests are done at multiple centers and include assessments at different time points.
• Participants must have email and internet access for reporting outcomes.

Eligible participants are aged 18-40, either concussed or non-concussed, and must meet other specific criteria. The study excludes those with severe concussions or recent MSKI surgeries.