Sir,
We have read this article with considerable interest. As is well demonstrated in this
manuscript, this is an efficacious treatment for a condition that is
otherwise
at times challenging to treat, and the authors are to be congratulated on
the
excellent clinical outcomes.
We agree that percutaneous spinal augmentation procedures done with
imaging guidance are often helpful in obviating the use of more invasive,
potentially dangerous and more morbid procedures that have typically been
employed in the past in the treatment of these lesions. As alluded to by
the
authors, experience has largely been limited to the use of percutaneous
vertebroplasty in the treatment of hemangiomas, and indeed the initial use
of
vertebroplasty in 1985 was for the treatment of a hemangioma of the
cervical
spine.1 Although clearly kyphoplasty in skilled hands has been shown
in
this manuscript to allow for an excellent clinical outcome, we would
suggest
that the use of vertebroplasty would have provided an equally good outcome
at considerably reduced expense, and in all likelihood with shorter
procedural
time.
Over the last five years kyphoplasty has been increasingly used
worldwide
and has been very aggressively promoted and marketed. Marketing has
stated that kyphoplasty is a safer procedure due to its purported lower
incidence of cement leakage. Although cement leakage is slightly higher
with
vertebroplasty, usually the only cement leakages which occur are trivial
and
of no clinical significance.2 The literature has clearly shown that in
skilled
hands both vertebroplasty and kyphoplasty are equally safe and provide
excellent clinical outcomes which are fundamentally similar.3
Kyphoplasty, however, uses a larger delivery system, 8 gauge or 10 gauge
systems versus 11 or 13 gauge needle systems, and is from eight to twelve
times as expensive. As has been pointed out by other authors, with this
greatly increased expense and a safety profile that is not demonstrably
different, it is difficult to justify a preference for kyphoplasty
compared with
vertebroplasty.3,4
The authors also correctly point out that the use of percutaneous
augmentation does not exclude a combination with other therapies such as
embolisation and/or surgery. This mirrors our own experience.
P.L. Munk MD, CM, FRCPC,
Professor, Head Musculoskeletal Section,
Department of Radiology,
M.K.S. Heran, MD, FRCPC,
Director, Diagnostic Neuroradiology Fellowship,
Division of Neuroradiology,
Department of Radiology,
Vancouver General Hospital,
University of British Columbia,
Vancouver, Canada.
1. Galibert P, Deramond H, Rosat P, Le Gars D. Preliminary note on the
treatment
of vertebral angioma by percutaneous acrylic vertebroplasty.
Neurochirurgie
1987;33:166-8.
2. Heran MK, Legiehn GM, Munk PL. Current concepts and techniques in percutaneous vertebroplasty. Orthop Clin North Am 2006;37:409-34.
3. Jensen ME, McGraw JK, Cardella JF, Hirsch JA. Position statement on
percutaneous vertebral augmentation: a consensus statement developed by
the American Society of Interventional and Therapeutic Neuroradiology,
Society of Interventional Radiology, American Association of Neurological
Surgeons/Congress of Neurological Surgeons, and American Society of Spine
Radiology. J Vasc Interv Radiol 2007;18:325-30.
4. Mathis JM. Percutaneous vertebroplasty or kyphoplasty: which one
do I
choose? Skeletal Radiol 2006;35:629-31.