OA and MRI

Hi,
I had surgery to repair a torn tendon in my left shoulder in 2000. About 1 year later I have OA in my left shoulder. Then my knees and my lower back were aching really bad, I had a MRI and a body scan which showed OA in my knees and lower back.
I had a MRI this year on my left knee, I have torn cartliage and a strained tendon or legiment.
My question is on the MRI why did it not show the OA in my left knee??? :confused:
Anyway info would be much appreciated...
Thanks
 
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