Ganglion :: Suspected Ruptured Ganglion Cyst

I have had pain in the outside of my right foot since August 2013 when I went over on that foot playing squash. Growing pain levels followed by an injection failed to sort the problem out. Two consultants later x-rays and scans showed the 5th metatarsal head bone was being eaten away at a dramatic rate. An operation and six weeks of 4000 mg antibiotics later there was still no idea what was causing the problem. Some more of the metatarsal head was removed during the operation and sent for analysis. not cancerous, not an infection, a final diagnosis is a ruptured ganglion cyst, but everything I have read about these says a) they occur in the hands, arms or sometimes calves and b) the treatment is a good hard whack with a heavy book. This releases the fluid which sounds to be harmless, but in my case it sounds as though the fluid is being blamed for eating the bone away - can this be possible?