Could osteoarthritis be misdiagnosed from an x-ray?

Certainly. The answer is: why are you asking? What is real question? There are a lot of things that can be misdiagnosed on x-ray.
NO. Basic levels of osteoarthritis can be evaluated and diagnosed by an x-ray. MRI can be helpful in looking at soft tissue structures of the joint or any bony damage as well.
Unlikely. X-rays have very classic findings for osteoarthritis that are tough to miss.

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