Technically it is a cavity. Merit Medical has an osteotome system that creates channels so that sounds similar. I do think they all create some increased safety with the initial injection but not sure you'll get any fracture reduction/height gain.
It'd hold up from a billing perspective but feels slimey
With a curette, you're not restoring height and therefore not a ballooon kyphoplasty, but a rather a (low-pressure) vertebroplasty. If you use the curette, then use a ballon, then cement then you can bill a kypho.
The currette can help create addition pathways through sclerotic bone. This is useful of the balloon doesnt give great inflation. For example, sometimes the balloon doesnt quite stretch across midline on unipedicular access, or sclerosis limits inflation on one side. You can open it at 45 and 90 degrees to create a bigger area. It is an extra cost. It would be used in addition to kyphoolasty not in place of it. No balloon = vertebroplasty.
PERCUTANEOUS VERTEBROPLASTY (BONE BIOPSY INCLUDED WHEN PERFORMED), 1 VERTEBRAL BODY, UNILATERAL OR BILATERAL INJECTION, INCLUSIVE OF ALL IMAGING GUIDANCE; LUMBOSACRAL
22514
PERCUTANEOUS VERTEBRAL AUGMENTATION, INCLUDING CAVITY CREATION (FRACTURE REDUCTION AND BONE BIOPSY INCLUDED WHEN PERFORMED) USING MECHANICAL DEVICE (EG, KYPHOPLASTY), 1 VERTEBRAL BODY, UNILATERAL OR BILATERAL CANNULATION, INCLUSIVE OF ALL IMAGING GUIDANCE; LUMBAR
The AAMC CPT code language is specifically for cavity creation with a mechanical device, so it covers all of the above, including the osteotome systems or the Stryker SpineJack.