Late breaking news

Amy tells me the orthopedist's office called. The MRI was not useful diagnostically. There's no sign of anything that would explain Samantha's knee pain -- no osteoma, no soft tissue damage, no developmental irregularities, nothing.

On one hand this is good news, since it means she is, technically speaking, perfectly healthy. On the other hand, we've now run out of diagnostic options and explanations for what she's going through, so all we can do now is manage the pain and hope that she grows out of it. Damn.