Rheumatoid arthritis (RA) and osteoarthritis (OA) are diseases associated with pain, swelling, stiffness, and loss of ability in joints [1]. Early diagnosis and treatment can delay the onset of severe disability [2]. The goal of this research is to help patients, who may be developing or have developed arthritis, to assess and monitor the progress of their disease using their smartphone. We developed image-processing algorithms to correct camera distortion and to transform the captured image to real-world spatial dimensions. This allows reproducible measurements of hand anatomy independent of the distance and angle of the smartphone camera. We can measure finger and joint thickness and angular deviation to monitor swelling and abnormalities. These are common symptoms of arthritis used in the American College of Rheumatology diagnostic criteria for RA and OA [3].

It is important to test the reliability of...

References

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