Magnetic resonance imaging has revolutionized the field of orthopaedic diagnostics, but it has until now been limited by delivering largely static images. Researchers at the University of California, Davis have developed a new MRI technique called “active MRI” that can depict wrist joints in motion at an amazingly fast temporal resolution of 475 milliseconds. The advance could permit a patient to replicate a motion that causes pain while allowing a physician to “see inside” for the cause while the joint is moving.
It may seem counterintuitive, but runners have a lower risk of knee orthoarthritis than walkers do. A July 2013 study followed more than 75,000 runners and 14,000 walkers and found that runners had a lower overall risk of developing arthritis than walkers. Runners generate greater knee forces than walkers, but due to the longer strides of running, the net result is less overall load on the runners’ knees than on walkers’ knees. Although running doesn’t decrease the cause of ‘wear’ on the knee, it seems better than walking for delaying development of osteoarthritis.