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I'm the original poster here.
A follow-up question-- why would my Dexa results be so different between sites? -2.2 in the lumbar spine vs only -1.0 and -1.3 in the femur/hip.
Replies to "I'm the original poster here. A follow-up question-- why would my Dexa results be so different..."
ga73ds,
different types of bone account for the discrepancy.
Bone in the spine is 33.5% trabecular bone in males. A trabecular cross section resembles a wax honeycomb with cavernous spaces. The structure gives it more surface to volume which is where trabecular bone remodels, This bone has more exposure to the bone marrow making calcium (and phosphorus) readily exchangeable.
While it isn't spongy it does have more give of flexibility than cortical bone and is more receptive to biomechanical forces that change the shape of the bone according to our activities. The femoral head is also the more easily dissolved trabecular bone. The dexa reading includes both cortical and trabecular bone in the femur.
I so like your question. And could go on. Sometimes I could be more clear; let me know if I've failed the question.
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I have the same question. I just had a new Dexa and my Lumbar Spine was -1.9 (two years ago it was -2.6). My femoral neck was -3.4. I'm wondering what the difference is; could it be error? I keep rejecting my doctor's advice for Prolia, but am worried about the femoral neck t score.