HI,

I have never experience Panosteitis with our dogs,
but I took out my trusty vet book.

Here is bits of what is in the book.

Panosteitis is a disease in puppies between 5 and 12 months of age.
Characteristic signs is the tendency for pain and lameness to shift from one location to another over a course of several weeks or months.
Treatment: As the cause is unknown, treatment is directed at
the relief of bone pain (see arthritis). Most dogs recover
spontaneously, but if severely affected, may never regain full muscle strength and condition.

I would talk to your vet about it and ask him about
when it is safe to start her on agility etc.
Sounds like most dogs recover 100 %.

I will think good thoughts for Magnum's full recovery ASAP.