A brand new study out of the Cleveland Clinic just tracked nearly 1,800 athletes through their knee replacement and recovery — and the results challenge a lot of what patients are being told. Only 53% made it back to sports within a year. But the ones who did? Most were back in just 12 weeks. So what separates the people who return from the ones who don't? As a sports medicine doctor in the San Francisco Bay Area, I treat patients with knee arthritis every week. And this que