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Meh... I dunno. I'm only in my second year and it's pretty much all book work. I'll state the obvious though. Your bone isn't healing.
Simply put, there needs to be enough bone-forming cells for completion of wound repair. There are many reasons for why there might not be. Scarring, infection, previous surgeries, radiation, gap between break too large, etc. might lead to a deficiency in the types of cells needed to repair the bone in that area.
For the bone to heal, these cells need a framework to build uopn. Kinda like using REBAR when you're pouring concrete. Not the best example, but should give you an idea. If the done defect is too big then the healing process can't be completed or it happens too slowly. They often use bone grafts in cases like this to provide help and give the cells a better framework to build upon. I've only seen it done once and they took the graft from the guy's tibia. I think the hip is another common place they borrow from.
I'm just a student though and really don't know that much yet so take what I say with a grain of salt. I hope everything works out for you.
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