T12-L3 midline allodynia; ideas?

56 y/o F who had mild T12 compression fx 20 years ago. Has had midline, neuropathic appearing pain along the T12-L3 spinous processes ever since. Allodynic to light touch and vibration in the spine midline. Had good relief for a few weeks after T12-L1 interspinous ligament injection, otherwise ESIs and MBBs in the area have been non effective. Recent CT, SPECT and MRI all WNL, nothing showing up. My thought is that it is interspinous ligament entheospathy or neuropathic pain from the... T12-L3 midline allodynia; ideas?
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