When you move, your knee feels forces, called joint loading. This study focuses on those who had surgery to fix a knee ligament, called the anterior cruciate ligament (ACL). After this surgery, people often take fewer steps daily, which might be bad for knee health. The study wants to see if taking more steps can help the knee's cartilage, which is the smooth tissue that covers the ends of bones in joints, stay healthy and prevent osteoarthritis, a joint disease. Using special scans called magnetic resonance imaging (MRI), researchers will check knee health in people who had ACL surgery. The study is for people who had ACL surgery 6-24 months ago and take less than 7,000 steps daily. It lasts 16 weeks, where participants will increase their daily steps. This study doesn't include people with other knee problems, certain medical devices, or if pregnant.

• Duration: 16 weeks of increased daily steps.
• Participants must have had an ACL surgery 6-24 months ago.
• Daily step count under 7,000 required for participation.