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An SD is a standard deviation and the -4.5 means that your bone density is 4.5 standard deviations lower than an average 30 year old. It's usually expressed as a t-score of -4.5; normal bone density is -1.0 or above, osteopenia (reduced bone density) is between -1.0 and -2.5, and osteoporosis is -2.5 and below, bearing in mind that negative numbers appear to get bigger, the lower they are (so -2.5 is worse than -1.0).
I don' t think there's an easy answer to that, sorry! -4.5 is a very poor t-score, but I once read of someone with a score of -6.0 who had never fractured. It's fracture risk that's the important measure, rather than just t-scores. You should have a FRAX fracture risk score (if not, I would ask for this to be done), which will tell you your chance of fracturing in the next 10 years (for example 20% risk of fracture). As you've already had spinal fractures, unfortunately that does raise your risk of further fractures and is a factor that will be taken into account when calculating the FRAX score.
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