Why did this happen to me?

I was due to start my rescheduled myeloma Revlite clinical trial on 15th April 2010. Unfortunately the evening before the trial I developed huge pain in my right femur the one that had been rodded and pinned 2 weeks prior. I could not apply any weight to my right leg. Next morning I could not get out of bed so phoned the hospital who cancelled my trial and ordered an ambulance to take me to hospital.
X-rays were taken that showed I had a small fracture at the lytic lesion.
The next 8 days were spent in hospital. Orthopaedics confirmed that the rod and pins were all in place with no problems there.
My pain killers were increased and physiotherapy commenced with leg exercises in bed. The rod and pins in my left humerus were giving me pain limiting the use of crutches. It was decided I needed a walker designed to take pressure off my arms. It has 2 handles for my hands like a triathletes handle bar and a flat padded base that I can lean on.
After 8 days I was released home in a wheel chair along with my walker.
Next haematologist appointment is Tuesday 27th April where we discuss what happens next.
This has been a huge disappointment to me with 2 attempts at the clinical trial being postponed at the last minute.
After reading of side effects of Lenalidomid and dexamethasone that others have experienced I wonder if it is worth having chemotherapy until the leg fracture is healed and I am mobile again. The side effect of cramp on a fractured leg worries me.